Text

TMI Dosimetry Project Rept for Data Collected 790331-0418
	ML19289F825
Person / Time
Site:	Crane
Issue date:	05/07/1979
From:	; FOOD & DRUG ADMINISTRATION
To:	;
References
	TR-790507, NUDOCS 7906200254
	Download: ML19289F825 (28)
	v • d • e

NRC

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'Ihree-Mile Island Dosimetry Project May 7c 1979 t

Bureau of Radiological Health Food and Drtg Administration S

235 260 29ne.cooa534 9.

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0 CCNTDirS Introduction.......................................

1 Description of Ibsimeter Package................... 1 Da ta Ic qu i s t i o n....................................

2 Data and Calculations..............................

3 Results of NBS Xe-133 Calib ration.................. 4 Re sults of Field Do s'e try..........................

6 Summary............................................ 7 Tables:

Table I -

Selected Sample Exposure Data, April 1 through April 10, 1979 Table II -

Selected Sample Exposure Data, April 10 through April 18, 1979 Table III - Expsure Data, March 31 through April 18, 1979 f

Attachments:

Attachment I -

Exploded View of Dosimetry Package Attachment II - M3p of Ebsimeter Sites 235 20; e

_a.

FDVERH hree-Mile Island Dasittetry Project Pay 7,1979 (Ebr data collected betwen March 31 throtx3h April 18, 1979)

Introduction In response to the Wree-Mile Island reactor incident, the BRH implenented a Tw radiation monitoring system.

It was determined that the system should be put in place to monitor the exposure that individuals might receive. We initial field placement was started the evening of Parch 31, 1979. A total of 173 dosimeter sites (237 dosimeter packages) were put in place by tbnday af ternoon, April 2,1979.

We dosimeter sites are distributed over a 20 mile radius (about 1200 square miles) centered at the %ree-Mile Island Reactor. Within the 0-10 mile radius the area was divided into 2 x 2 mile grids.

% e individual grid sectors were weighted by population and sites were identified in the field on the following basis:

High Population Density - 4 dosimeter sites Medium Population Density - 2 dosimeter sites low Population Density - 1 dosimeter site When pssible two dosimeter packages were placed at each sf te, one outside and one inside a building. In the 10-20 mile ring, external sites only were used.

We dosimeters were left in place until a snall sample (19) were collected and replaced on April 10, 1979, for a preliminary evaluation.

All of the dosimeters packages (less those lost) were retrieved on April 17-18, 1979, and replaced with new dosimeters. Eis second batch will remain in place for as yet an undetermined period, but probably about one month.

Description of Dosimeter We Bureau of Radiological Health (BRH) maintains an inventory of over 30,000 Lithium Flturide (LiF) TLD 100 high sensitivity chips. Wese dosimet' nave been extensively investigated by BRH for dosimetry of medical.-ray facilities. W erefore, when the Bureau vas requested to provide on very short notice environmental monitoring around the stricken reactor, these were the dosimeters chat were chosen.

Each dosimeter package contains eight (8) Lif thermoltninescent chips (TLD-100, Harshaw Chemical Company, Solon, Chio). Rese Tw chips have a measured relative standard deviation of approximately 3.0% in radiation response.

235 262

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J An exploded view cf c.= dosimeter package is shown P.s Attachment I.

(TG positions are iden' ied with numbers 1 throtgh 4.)

Wese four chipc at the center of the do fmeter (positions 2 and 3) are shielded by approximately 3 mm of altninum. An identification label is affixed to the outside surface of the dosimeter.

We entire dosimeter package is sealed inside a polyethylene bag (0.1 m thickness) for protection against water damage. We cuter four chips (psitions one and four) thur are shielded by 0.1 r:n of palyethylene, tw layers of paper (approximately 0.1 m) and tw thicknesses of plastic adhesive tape.

Data Accuisition All chips were annealed for 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months at 400'C and for 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months at 100'C prior to dosimeter assembly and shipnent of the dosimeter package. %e TLD chips were grouped so that the TLD batch integrity could be maintained.

Since TLD materials provide only relative values for radiation exposure it is necessary to perform calibration exposures from which absolute estimates of exposure calculations can be made. From each 500 chip batch, fifty chips were selected and given a known exposure (1 R) with the 100 kVep (5.0 rn Al HVL) x-ray beam at BRH.

Fifty chips from each batch were selected and stored at BRH to be used for control (unexposed) data.

Upon receipt of envirornental dosimeters from the field, the TQ chips are removed from the cards and loaded into a reader tray. Icading is performed such that each set of twa chips is loaded into the reader tray, starting from the label side of the dosimeter and progmessing throtgh the card.

In addition, each ribbon is positioned so that the ribbon face closest to the label is "up" in the reader tray.

In this way, chips from 5 dosimeter packages along with 5 calibration-chips and 5 in-house control chips are loaded into each 50 position reader tray.

Each loaded tray is annealed for ten minutes at 100'C and then allowed to cool to room temperr ure before being placed in the TG reader. Se TG reader is the ATIM unit manufactured by Harshaw Q1emical Company, Solon, Chio.

A complete description of the operation of this system is not necessary but certain reader parameters are:

Re Mer Temperature 250'C Nitrogen Flow Late 8 CFM Current Integration Time 18 sec.

Cycle Time 21 sec. 235 26; e

ca 3

he reader system provides a r,1gnal in nanocculombs (nC) which corresponds to the integrated light output from the TLD during the heating cycle. De integrated current signals for the TLD reader for the chips in the BEH x-ray exposed dosimeter package were used for entrance exp :ure calibration and to verify the effective energy of the BRH x-ray spectrom.

Data and Calculations It is important to note that the effective energy of the calibration source (between 35 - 40 kev) does not differ greatly from the effective energy of Xenon 133 photons. Recent (unpublished) energy response data for LiF TLD materials has been obtained by BRH personnel using standard x-ray calibration beams and is shown in figure 1.

he nC reacing of a chip which has been exposed in the field is the stra of the TL signal related to any radiation received in the field and a background signal, or offset, including non-radiation related ltrainescence of the chips and instrtnental noise. S e exposure reported for a dosimeter package is the mean value of the estimated exposures of 4 chips at the center of the package, betwen the two 3m thick Al disks, corrected for the attenuation by the 3m of Al of the 81 kev gama frora 133 Xe and the associated Cs x-rays. 21s is obtained by averaging the nC reading of the four chips and subtracting an instrument background reading for the batch from which the ribbons came to obtain net mean nC.

Bis reading is then interpreted as radiation exposure by multiplying it by an exposure /

charge ratio (mR/nC) obtained from calibration exposures perforred at the BRH x-ray calibration laboratory with a 100 kVcp (5.05 m Al HVL) beam. his exposure estimate is then adjusted for the " expected" natural radiation background of the area. his background factor was based on the average expsures of 17 control packages which accompanied the field dosimeters to the Harrisburg area. Wese values were adjusted for the number of days between anneal and read. 21s " excess" field exposure is then adjusted for the attenuation of the Xe-133 photon spectrtn by 3ma of Al asstning narrow beam, normal incidence, geometry.

In equation form this is:

X = R - Ro) x C - B

.619 where X = the estimated external photon exposure of the package in excess of the expected natural background expsure R = the mean nC reading of the four central chips of the package Ro = the instrt=ent background of the appropriate chip batch C = the calibration factor (mP/nC) of the batch obtained with the 100 kVcp (5m Al HVL) x-ray beam.

235 266

d B = expected natural radiation background for the number of days the package was in the field (obtained from 17 field control packages) and.619 = the attenuation of a beam of photons from Xe-133 by 2nm of A1.

It is asstraed tnat the entire " excess" exposure to the package was from Xe-133.

In addition to this asstraption two other assumptions implicit in this procedure introdtre biases which are unknown but thotght to be snall. %e estimate of natural background which is subtracted from the exposure estimate of the package was not obtained from measurenents at the dosimeter site but at another location within the Harrisburg area.

For the short time of exposure of these packages this error should not be more than 2 mR.

We attenuation correction asstraes a source at a distance in the general direction of the normal to the front surface of the package. Wis is appropriate for a package in a protected site such as under the eaves of a building.

Ebr a package in a less protected site or in an imersion situation this correction is too small as photons travelirg at large angles to the package surface normally will traverse more than 3m of lil.

%e error introdtred by this asstrnption is expected to be less thar a factor of two in the worst case.

Ebrther studies of this effect are underway.

We readirgs of the chips at positions one and four (see Attachnent I) have not been used in these exposure estimates because of their signifi-cant, thotyh low, sensitivity to beta radiation.

Ebrther studies of this beta response are underway.

If a meaningful way of interpreting the readings of the surface chips can be developed these interpretations will be released when available. 2 e data reported here are preliminary.

Wey are subject to change es turther studies of the response of this dosimeter package and better information on natural background radiation at the actual sites monitored permit more refined estimates to be made.

Results of NBS Xe-133 Calibration On April 4,1979, the Nuclear Regulatory Commission (NRC) requested all participants in radiation nonitoring at the tre<H4ile Island, Pennsylvania area to provide dosimeters to the National Bureau of Standards (NBS) for exposure to a known anount of radiation. %ese dosimeters were to be exposed using Xenon-133 gas, which it both a beta and a gama emitter.

Exposures were performed under two separate experimental conditions. One exposure was accomplished by placing the dosimeters in the bottom of a large glass flask whien was then filled with a known concentration of Xenon-133.

%e other exposure was accomplished by placing the dosimeters a fixed distance, in air, from a glass ampule of Xenon-133.

In this arangernent only the ganna radiation would reach the dosimeters.

235 265 I

.J.

. Participants were told only that the experiment would give beta and gama exposures in one case and a gccina exposure in the other. Each dosimetry group was requested to provide a value for the expsures received by their dosimeters.

MATERIALS AND METriOD Sixteen (16) numbered dosineter packages were assembled at BRH in the same manner as those sent to the Pennsylvania area. W ese 16 dosimeter packages were then sent to NBS for exposure but only two dosimeter packages were exposed. Dasimeter package numbet 190 was imersed in the Xenon-filled flask, while dosimeter package ntrnber 177 was exposed to the Xenon @otons only. We remaining (unexposed) dosimeter packages were then available as control desiaeters.

RESULTS External Exposure From the TL readings of the LiF chips and applying the correction factor derived from the BRH x-ray calibration, the entrance exposure for dosimeter package ntznbe-177 (photons only) was determined to be 101 milliroentgen (mR).

i 2

me fractional transmission of the Xenon photons throtzgh 3 cra (0.81 g/cm )

altrainum (using the relative photon abundance values.for Xenon-133) was calculated to be 0.619.

We ratio of the @oton intensity at Position 2 (see attached drawing, Attachment I) to the photon intensity at Position 1 measured by the NBS exposed dosimeter was 0.tiu.

H is correspnds to an extrapolated exposure of 97.9 mR at the package entrance as opposed to the 101 mR actually measured.

Immersion Experimental results from the exposure of dosimeter package number 190 were difficult to interpret. Wis is because the dosimeter has never been investigated for beta dose measurcrtents.

If it is asst 1ned that the TLD readings for chips in Positions 2 and 3 (see

..tached drawing) were due to gan:na exposure'only, then a ga=a exposure of approximately 0.7R is obtained for the dosimeter.

(This is done by calculating the attenuation of Xenon-13.' T hotons by the 3 rra of altznintzn).

No accurate determination of the beta dose from this imersion experiment can be performed at this time. Ibwever, another experiment is presently being conducte to evaluate the response of the dosimeter package to various known concentrations of Xe-133.

235 266

4 Summary of Results of NES Xe--133 Calibration Expasure of the BRH docimeter by a Xenon-133 filled anpule was determiaed to be 101 mR.

An estimate of error for this value is +10 mR.

We immarsion exposure of the ERH dosimeter failed to provide any vdid quantitative information.

NBS has not yet reported the true exposure.

I Resttlts of Field Dosimetry

=

ne summary of dosimeter sites is:

Sites with inside 42 in public places 7btal 64 and outside dosimeters 22 in residences packages sites with outside 70 at isolated sites (Poles) 7btal 109 dosimeter package 39 in more populated areas only We total distribution by April 2,1979:

173 Sites and 237 dosimeter packages ne locaticn of the dosimeter sites is presented in the attached map (Attachment II) of the area surrounding the tree-Mile Island plant.

Each site is designated on the map by a black dot and the associated site ntnber.

W e map has been cut inte 4 quadrants centered on the reactor site for convenience of the report and to maintain detail.

We atta:hed tables contain the dosimetry information. H e data is arranged by azimuth (North = 0') and dire; tion (in miles) from the reactor within each compass sector. We date and time of dosimeter placement and retrieval is noted. We coltnn headed " Site description" indicates the type of suppart used 7er the dosimeter ard tha distance from ground level (in feet). Sites which had both inside and outside dosimeter package are clearly indicated in this table. A site ntnber identified with an associatea "I" indicates that the dosimeter package was located inside of a structure.

Ebr example, Site #240 had dosimeter packages inside and outside of the building, #241 was outsice and pacPqe

240 was inside.

Since a small sample of sites was selected for early exchange, the data is presented in three (3) separate tables. Table I contains the data for the sites that were exchanged on April 10, 1979, Table II contains data for the same sites as in Dble I for the time period between April 10 and the time when all sites were exchanged (April 17 and 18,1979). Table III is a caprehensive listing of all 173 sites and includes exposure values measured from the time the dosimeters left BRH on March 31, 1979, o / ~/

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a until they were returned for reading.

Ebr those sites Milch were incitxied in the first traall sample, the data presented for Table III is simply the addition of the exposure value contained in Table I plus the extrsure value contained in Table II.

Rese sites are indicated by circled exposure values in Table III.

Sumnary

~v te Bureau is aware that the dosimeter material used in this survey,Lithitzn Fluoride, is not the most sensitive thermoltninescent material commercially available for dosimetry. Ibwever, it Is the only TLD material of which the Bureau had sufficient supply for this large scale survey.

We data obtained from all 173 nonitoring sites in the twenty mile radius around the reactor shows that only 25 sites (located generally to the North and East of the reactor) had detectable exposures. W e estimated exposures did rnt exceed 20 milliroentgens for the period March 31 to April 18, 1979, at any site whr.re the TLD cards were recovered intact.

s 235 200

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Figure 1.

Energy dependence of TLD 100.

The multi-energetic spectnra is nomalized to one at 0.96 t=a Al HVL.

Likewise, the manoenergetic spectnen is nomalized to one at 1.3 m A1.

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235 270 Y

L Table I-Selected Sample Expuoore Data, April 1 - April 10,1979

< age 1 Sector l Site lDiscancel Azimuth l TLD I l Date/ Time l

Ente / Time l Elapsed l Estimated (a)l Site (e) g Placed (bllected Time Exposure

'Iype (days)

(15 tra)

N 139 5.25 350 139 4/1 - 1705 4/10 - 1615 9.0 15 U(6)

NNE 141 5.75 17 141 4/1 - 1720 a /10 - 1245 8.8 3* (b)

U(6)

NNE 127 9.00 27 127 4/1 - 1417 4/10 - 1000 8.8 18 U(10)

NNE 246 13.75 12 246 d

U(10)

NE 119 1.75 40 119 4/1 - 1122 4/10 - 1230 9.0 7*

U (7)

NE 122 4.25 38 122 d

U(6)

NE 248 16.50 43 248 4/1 - 1315 4/10 - 1025 8.9

~7*

B(10)

E 247 17.50 87 247 4/1 - 1445 4/10 - 1050 8.8

-7*

W(6)

ESE 039 2.75 106 039 4/1 - 0015 4/10 - 1200 9.5 5*

T(6)

N u SE 033 0.25 143 033 4/1 - 1130 4/10 - 1225 9.0 15' U(6)

U' SE 249 15.00 126 249 4/1 - 1615 4/10 - 1140 8.8

-1*

B(12)

SSE 040 1.75 160 040 d

U(10)

S 096 4.75 182 096 4/1 - 1655 4/10 - 1220 8.8

-1*

U(7)

S 207 13.25 -

183 207 1/1 - 1510 4/10 - 1100 8.8

-l*

B(7)

SV 036 2.00 216 036 4/1 - 1233 4/10 - 1300 9.0 6*

C(6)

Si 206 12.75 214 206 4/1 - 1445 4/10 - 1040 8.8

-2*

B(7)

WSW 224 16.00 2'3 224 4/1 - 1200 4/10 - 1540 9.1

-6*

C(6)

W 069 5.00 273 069 4/1 - 1422 4/10 - 1315 9.0 3*

C(8)

W 068 7.50 260 068 4/1 - 1500 4/10 - 1330 8.9 0*

W(6)

W 203 16.50 270 203 4/1 - 1242 4/10 - 1000 8.9

-2*

C(6) htM 278 6.50 284 278 4/2 - 1340 4/10 - 1350 8.0

-7*

U(12)

(a) Net exposure, expected natural background exposure subtracted.

(b)

Means estimated exposure is less than two standard deviations of the readings of the control dosimeters.

(c) Reading question ble due to dosimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

L Table I-Selected Sample Exp.

.e Data, April 1 - April 10,1979

.ge 2 Sector l Site lDistancel Azimuth l TW i l Date/ Tine l

Date/ Time l Elapsed l Estimated ( } l Site ("} l Place.1 Chllected Time Exposure

'Iype (days)

(15 mR)

IM 144 7.50 326 144 d

U(6)

IM 201 14.50 309 201 4/1 1145 4/10 - 0920 8.9 4*

C(7)

NtM 143 6.25 331 143 d

WS(4)

Nw Ln Nv c:

(a) Net exposure, expected natural background exposure subtracted.

(b)

Means estimated exposure is less than two standard deviations of the readings of the control dosimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

L Table II-Selected Sample Ext.

re Data, April 10 - April 18, 1979

.ge 1 Sector l Site lDistancel Azimuth l T O I l Date/ Time l

Date/ Time l Elapced l Estimated (a)

Site l

Placed Collected Time Exposure

'Iype (days)

(15 tra)

N 139 5.25 350 413 4/10 - 1615 4/17 - 1700 7.0 2* (b)

U(6)

NNE 141 5.75 17 410 4/10 - 1245 4/17 - 1615 7.2 3(c)

U(6)

INE 127 9 00 27 402 4/10 - 1000 4/17 - 1400 7.2 0*

U(10)

INE 246 13.75 12 401 4/10 - 0945 4/17 - 1045 7.0 5(c)

U(10)

NE 119 1.75 40 408 4/10 - 1230 4/18 - 1240 8.0

-?. (c)

U(7)

NE 122 4.25 38 409 4/10 - 1237 4/17 - 1600 7.2 4*

U(6)

NE 248 16.50 43 403 4/10 - 1025 4/17 - 1430 7.2

,(c)

B(10)

E 247 17.50 87 404 4/10 - 1050 4/17 - 1045 7.0 W(6)

ESE 39 2.75 106 405 4/10 - 1200 4/18 - 1047 7.9 1[

T(6)

SE 33 0.25 143 407 4/10 - 1225 4/18 - 1101 7.9

-1*

U(6)

SE 249 15.00 126 420 4/10 - 1140 4/17 - 1200 7.0 3e B(12)

SSE 40 1.75 160 406 4/10 - 1205 4/18 - 1055 7.9 4*

U(10)

NuS 96 4.75 182 421 4/10 - 1220 4/17 - 1509 7.1

-3*

U(7) 0, S

207 13.25 183 419 4/10 - 1100 4/17 - 1100 7.0

-2*

B(7)

N.SW 36 2.00 216 422 4/10 - 1300 4/17 - 1245 7.0

-6*

C(6)

{';[, SW 206 12.75 214 418 4/10 - 1040 4/17 - 1228 7.1 2*

B(7) hs1 224 16.00 253 414 4/10 - 154C 4/17 - 1030 6.8

-4*

C(6)

W 69 5.00 273 423 4/10 - 1315 4/17 - 1230 7.0

-4*

C(8)

W 68 7.50 260 424 4/10 - 1330 4/17 - 1200 6.9 0*

W(6)

W 203 16.50 270 417 4/10 - 1000 4/17 - 1005 7.0

-4*

C(6) hw 278 6.50 284 425 4/10 - 1350 4/17 - 1550 7.1

-1*

U(12)

(a) Net exposure, expected natural background exposure subtracted.

(b)

Means estimated exposure is less than two standard deviations of the readings of the cortrol dosimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground) e.....

L Table II-Selected Sample Expu sre Data, April 10 - April 18,1979

_je 2 Sector l Site IDistancel Azimu,h l TLD I i Date/ Time l

Date/ Time l Elapsed j Estimated (a)l Site ("

l PlaceJ Collected Time Exposure

'lype (days)

(15 rcR) 174 144 7.50 326 412 4/10 - 1600 4/17 - 1700 7.0 3* (b)

U(6)

IM 201 14.50 309 416 4/10 - 0920 4/17 - 0900 7.0 3*

C(7)

Nhw 143 6.25 331 411 4/10 - 1305 4/17 - 1700 7.2

-2 (c) hS(4) s e

N u

U7 N

-N-(a) tiet exposure, expected natural background exposure subtracted.

(b)

Means estimated exposure is less than tw standard deviations of the readings of the control dosiructers.

(c) Reading questionable due to dosimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U. Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

I Table III-Exposuro Data,. arch 31 - April 18, 1979

.ae1 Sector l Site IDistancel Azimuth l TID 4 l Date/ Time l

Date/ Time l Elapsed l Estimated (a)l Site "I l I

(miles)

Placed Chilected Time Exposure Type (days)

(i5 rra)

N 240 0.75 7

241 4/2 - 1149 4/18 - 1230 16.0 0* (b)

B(6)

N 240-I 0.75 7

240 4/2 - 1149 4/18 - 1230 16.0

-2 (c)

B(6)

N 105 3.25 1

105 3/31 - 2227 4/18 - 1300 17.6 9*

C(5)

N 105-I 3.25 1

106 3/31 - 2227 4/18 - 1300 17.6 7*

C(5)

N 103 4.25 352 103 3/31 - 2208 4/18 - 1210 17.6 8*

C(5)

N 103-I 4.25 352 104 3/31 - 2208 4/18 - 1210 17.6 7*

C(5)

N 142 5.00 5

142 4/1 - 1735 4/17 - 1630 16.0 2*

U(6)

N 139 5.25 350 Wo Cards Summed - See Tables I and II

@ (f)

U(6)

N 138 6.00 355 138 4/1 - 1650 4/17 - 1300 15.9 9(c)

U(10)

N 135 7.50 4

136 4/1 - 1600 4/17 - 1200 15.8 7*

B(6)

N 135-I 7.50 4

135 4/1 - 1600 4/17 - 1200 15.8 15 C(7)

N 133 7.75 7

134 4/1 - 1550 4/17 - 1200 15.9 5*

B(6)

N 133-I 7.75 7

133 4/1 - 1550 4/17 - 1200 15.9 7*,

C(6)

N 131 8.00 8

132 4/1 - 1530 4/17 - 1130 15.8 6*

C(6)

N 131-1 8.00 8

13 1 4/1 - 1530 4/17 - 1130 15.8 4 (c)

C(6)

N 129 8.75 11 130 4/1 - 1442 4/17 - 1100 15.9 12 M(4)

N N

129-I 8.75 11 129 4/1 - 1442 4/17 - 1100 15.9 12 C(6) u N

137 9.00 357 137 4/1 - 1620 4/17 - 1700 16.0 2 'c)

U(10) u, 12JE 140 4.50 23 140 4/1 - 1716 4/17 - 1630 16.0 5(c)

U(6)

N INE 141 5.75 17 Wo Cards Suumed - See Tables I and H U(6)

]',INE 124 6.00 32 124 4/1 - 1350 4/17 - 1550 16.1 11 U(10)

INE 128 8.50 27 128 4/1 - 1424 4/17 - 1400 15.0 9*

U(10)

INE 127 9.00 27 Wo Cards Summed - See Tables I and II U(10)

INE 243 9.50 18 243 4/1 - 1235 4/17 - 1330 16.0

-F B(8) laE 246 13.75 12 Wo Cards Summed - See Tables I and II U(10)

NE 119 1.75 40 Wo Cards Summed - See Tables I are! II U(7)

NE 120 2.75 35 121 4/1 - 1136 4/18 - 1235 17.0 Sa C(5)

NE 120-I 2.75 35 120 4/1 - 1136 4/18 - 1235 17.0 7*(b)

C(5)

NE 122 4.25 38 Wo Cards Summed - See Tables I and II QD U(6)

NE 011 4.75 55 011 4/1 - 1640 4/17 - 0910 15.7 6*

T(5)

NE 123 5.50 42 123 4/1 - 1201 4/17 - 1600 16.2 17 U(7)

(a) Net exposure, expected natural background exposure subtracted.

(b)

Means estimated exposure is less than tw standard deviations cf the readings of the control dosimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Ible, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

,,(f). Q Indicates simmed data from two dosimeter cards. The accuracy and significance of the ntninr is oncertain.

g,,,,

L Table III-Exposure Data,

.ch 31 - April 18, 1979

..: 2 Sector l Site lDistancel Azimuth l TW i l Date/ Time l

Date/ Time l Elapsed l Estimated (a) l Site ( }l (miles)

Placed Collected Time Exposure Type (days)

(15 rR)

NE 012 5.75 52 012 4/1 - 1630 4/17 - 0915 15.7 5* (b)

T(7)

NE 125 7.25 47 125 4/1 - 1350 4/17 - 1550 16.1 7(c)

C(6)

NE 248 16.50 43

'No Cmds Summeo - See Lbles I and II

-5 (f)

B(10)

NE 245 20.75 51 245 4/1 - 1405 4/17 - 1400 16.0

-3 (c)

B(15)

DIE 214 1.50 76 214 4/2 - 1200 4/23 - 1200 21.0 d

W(6)

DE 214-I 1.50 76 215 4/2 - 1200 4/23 - 1200 21.0

-3*

W(6)

DJE 010 3.75 60 010 4/1 - 1645 4/17 - 0905 15.7 10*

U(8)

ENE 047 4.00 76 047 3/31 - 2200 4/18 - 0950 17.5 4 (c)

W(8)

DIE 047-I 4.00 76 048 3/31 - 2200 4/18 - 0950 17.5 7*

W(8)

ENE 013 6.50 64 013 4/1 - 1610 4/17 - 0925 15.7 13 hS (7)

DIE 126 7.50 57 126 4/1 - 1402 4/17 - 1530 16.1 d

U(10)

DJE 014 9.00 74 014 4/1 - 1600 4/17 - 0935 15.7 12 (q)

U(5)

DJE 223 12.75 63 223 4/1 - 1720 4/17 - 1530 15.9

-3*

B(8)

E 049 5.50 84 049 3/31 - 2130 4/17 - 1520 16.7 4*

W(7)

E 049-I 5.50 84 050 3/31 - 2130 4/17 - 1520 16.7 14 B(12)

E 005 6.25 85 005 4/1 - 1810 4/17 - 1500 15.9 9*

U(10)

E 008 6.25 89 008 4/1 - 1700 4/17 - 1430 15.9 10 (c)

W(6)

N E

008-I 6.25 89 009 4/1 - 1700 4/17 - 1430 15.9 13 B(8)

'j' E

006 6.50 87 006 4/1 - 1800 4/17 - 1420 15.8 6*

T(10)

E 006-I 6.50 87 007 4/1 - 1800 4/17 - 1420 15.8 12 C(8)

N E

043 6.50 93 043 3/31 - 2300 4/17 - 1400 16.6 1(c)

W(7)

E 043-I 6.50 93 044 3/31 - 2300 4/17 - 1400 16.6 5*

C(7)

~.

c' E

041 6.50 96 042 3/31 - 2330 4/17 - 1355 16.6 2*

W(7)

E 041-I 6.50 95 041 3/31 - 2330 4/17 - 1355 16.6 3*

C(7)

E 038 6.75 86 038 4/1 - 0030 4/17 - 1425 16.6 17 (c)

U(10)

E 003 7.00 91 003 4/1 - 1830 4/17 - 1445 15.8 8 (c)

W(9)

E 003-I 7.00 91 004 4/1 - 1630 4/17 - 1445 15.8 8*

W(5)

E 002 7.75 97 002 4/1 - 1845 4/17 - 1350 15.8 2*

U(7)

E 015 9.00 83 015 4/1 - 1545 4/17 - 0945 15.8 7*

U(10)

(a) Net exposure, expected natural background exposure subtracted.

(b)* Means estimated exposure is less than two standard deviations of the readings of the control dcsimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter rot read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

(f) O Indicates stmed data from two dosimeter cards. 'Ihe accuracy and significance of the ntnber is uncertain.

/:

~-

lli

[e i

. l.};}.},l

.jf fj,

)fi

,llf.Yl...*;

gy}gl L

Table III-Exposure Data,

.ch 31 - April 18, 1979

.3 Sector l Site lDistancel A.:imuth l TID i l Ibte/Tirne l

Date/ Time l Elapsed l Estimated (a)l Site ("}l (miles)

Placcd Collected Time Exposure Type (days)

(15 rra)

E 016 9.25 89 016 4/1 - 1530 4/17 - 0950 15.8 5* (b)

U(8) 5 E

247 17.50 67 Two Cards Summed - See Tables I and II

@ (f)

W(6)

~

ESE 226 0.75 120 226 4/2 - 1225 4/23 - 1200 21.0 d

W(6)

ESE 226-I 0.75 120 227 4/2 - 1225 4/23 - 1200 21.0 d

W(6)

ESE 039 2.75 106

'No Cards Summed - See Tables I and II T(6)

ESE 001 5.25 109 001 4/1 - 1900 4/10 - 1020 16.6 15 U;7)

ESE 045 5.75 102 045 3/31 - 2230 4/18 - 1010 17.5 6*

C(7)

ESE 045-I 5.75 102 046 3/31 - 2230 4/18 - 1010 17.5 4 (c)

C(8)

ESE 021 7.00 120 021 4/1 - 1400 4/18 - 1032 16.8 6*

U(6)

ESE 019 8.25 102 019 4/1 - 1415 4/17 - 1000 15.8 2 (c)

U(10)

ESE 019-I 8.25 102 020 4/1 - 1415 4/17 - 1000 15.8 3*

C(6)

ESE 024 9.00 119 024 4/1 - 1330 4/17 - 1315 16.0 9*

C(6)

ESE 024-I 9.00 119 027 4/1 - 1330 4/17 - 1315 16.0 5*-

C(5)

ESE 022 9.25 114 022 4/1 - 1345 4/17 - 1325 16.0 7*

U(7)

ESE 222 11.00 10 5 222 4/1 - 1650 4/17 - 1335 15.9 d

W(8)

ESE 017 12.00 105 017 4/1 - 1515 4/17 - 1020 15.8

-1*

W(8)

ESE 017-I 12.00 105 018 4/1 - 1515 4/17 - 1020 15.8 4*

C(6)

%E 244 23.50 112 244 4/1 - 1515 4/17 - 1115 15.8

-5 (c)

C(12)

U SE 033 0.25 143

'No Cards Stinmed - See Tables I and II U(6)

N SE 032 1.00 144 032 4/1 1140 4/18 - 1100 17.0 3 (c)

U(8)

~.: SE 030 5.25 126 030 4/1 - 1220 4/IP - 1038 16.9 10*

U(15) w' SE 029 6.75 141 029 4/1 - 1230 4/17 - 1235 16.0 7*

hS(10)

SC 028 8.50 139 028 4/1 - 1245 4/17 - 1245 16.0 7*

U(19)

SE 025 9.25 125 025 4/1 - 1300 4/17 - 1250 16.0 5*

W(6)

SE 025-I 9.25 125 026 4/1 - 1300 4/17 - 1250 16.0 5*

C(8)

SE 213 9.75 145 213 4/2 - 1900 4/18 - 1425 15.8 0(c)

U(10)

SE 249 15.00 126

'No Cards Summed - See Tables I and II B(12)

SE 210 16.50 140 210 4/1 - 1645 1/17 - 1000 15.7 3*

C(7)

SE 250 17.50 130 250 4/1 - 1550 4/17 - 1150 15.8 3 (c)

W(7)

(a) Net exposure, expected natural background exposure subtracted.

(b)* Means estimated exposure is less than two standard deviations of the readings of the control dosimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter rut read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

(f) O Indicates summed data from two dosimeter cards. 7he accuracy and significance of the nt1nder is uncertain.

e Iut,6 g,

-L Table III-Exposure Data,. arch 31 - April 18, 1979

._ge 4 Sector l Site lDistancel Azimuth l TLD f l Date/ Time l

Date/ Time l Elapsed l Estimated "}l Site ")l I

I (miles)

Placed Collected Time Exposure Type (days)

(15 tra)

SSE 111 0.75 158 111 3/31 - 2350 4/18 - 1400 17.6 11(c) c(7)

SSE 111-I 0.75 158 112 3/31 - 2350 4/18 - 1400

17. 6 10 * (b)

C(6)

SSE 023 1.25 159 023 4/1 - 1150 4/18 - 1100 17.0 13 U (10)

SSE 040

1. 5 160 Two Card., Summed - See Tables I and II

@ (f)

U(10)

SSE 053 4.25 161 053 4/1 - 1120 4/17 - 1545 16.2 9

hS(6)

SSE 031 5.25 147 031 4/1 - 1205 4/17 - 1230 16.0 3*

U(7)

SSE 031-I 5.25 147 034 4/1 - 1205 4/17 - 1230 16.0 4*

C(5)

SSE 054 5.50 165 054 4/1 - 1130 4/17 - 1549 16.2

-2*

U(6)

SSE 059 7.50 165 059 4/1 - 1225 4/17 - 1600 16.2 d

W(7)

SSE 059-I 7.50 165 060 4/1 - 1225 4/17 - 1600 16.2 d

W(7)

SSE 061 8.00 151 061 4/1 - 1240 4/18 - 1430 17.1 5*

U(7)

SSE 209 19.00 162 209 4/1 - 1610 4/17 - 1020 15.8

-4*

B(6)

S 098 2.00 180 098 4/1 - 1710 4/17 - 1527 15.9 11(c)

U(7)

S 051 3.75 180 051 4/1 - 1100 4/17 - 1534 16.2

-3 (c) hs(7)

S 051-I 3.75 180 052 4/1 - 1100 4/17 - 1534 16.2

-2*

B(7)

S 096 4.75 182

'No Cards Summed - See Tables I and II U(7)

S 097 5.25 17 8 097 4/1 - 1700 4/17 - 1515 15.9 2*

U(6)

BJ S 095 5.25 184 095 4/1 - 1650 4/17 - 1503 15.9 d

U(6)

U S 086 6.25 190 086 s4/1 - 1550 4/17 - 1407 15.9 3*

U(6)

S 055 6.50 lil 055 4/1 - 1140 d

U(7)

S 055-I 6.50 171 056 4/1 - 1140 4/17 - 1605 16.2 1*

B(7) ng

s. :.S 057 6.75 17 8 058 4/1 - 1140 4/17 - 1605 16.2 2*

C(6) co S 057-I 6.75 178 057 4/1 - 1140 4/17 - 1605 16.2 d

C(10)

S 085 7.25 191 085 4/1 - 1540 4/17 - 1400 15.9 d

U(6)

S 064 9.25 182 064 4/1 - 1315 4/17 - 1122 15.9

-1*

U(6)

S 064-I 9.25 182 065 4/1 - 1315 4/17 - 1122 15.9 3*

C(6)

S 062 9.50 170 062 4/1 - 1253 4/17 - 1115 15.9 0*

U(6)

S 066 9.50 187 066 4/1 - 1330 4/17 - 1130 15.9

-3*

W(6)

S 066-I 9.50 187 075 4/1 - 1330 4/17 - 1130 15.9 1*

W(8)

S 063 10.25 17 3 063 4/1 - 1300 4/17 - 1110 15.9 d

U(10)

(a) Net exposure, expected natural background exposure subtracted.

(b)* Means estimated exposure is less than two standard deviations of the readings of the control dosimeters.

(c) Reading questionable due to dosimeter damagc (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

(f) O Indicates s<mmed eata from two dosimeter cards. she accuracy and significance of the ntnber is uncertain.

~....

L

".;1e III-Exposure Data,

.cch 31 - April 18, 1979

,e 5 Sector l Site lDistancel Azimuth l TII; I l Date/ Time l

Ib te/ Time l Elapsed l Estimated l

Site (U}[

(miles)

Placed Collected Time Exposure Type (days)

(15 ra)

S 207 13.25 183

'No Cards Summed - See Tables I and II

@ (f)

B(7)

SSW 091 4.50 200 091 4/1 - 1620 4/17 - 1456 15.9 d

W(6)

SSN 091-I 4.50 208 092 4/1 - 1620 4/17 - 1456 15.9 3 * (b)

W(6)

SSW 093 4.50 209 093 4/1 - 1635 4/25 - 1200 23.8 d

U(6)

SSV 094 5.00 195 094 4/1 - 1640 4/17 - 1500 15.9 5*

U(6)

SSi 090 5.00 206 090 4/1 - 1615 4/17 - 1440 15.9 2(c)

U(6)

SSV 087 5.25 202 087 4/1 - 1555 4/17 - 1136 16.0 13 WS(6)

SSW 088 5.75 206 088 4/1 - 1600 4/17 - 1430 16.0 14 (c)

U(6)

SSW 089 5.75 210 089 4/1 - 1505 4/17 - 1425 16.0 4*

U(6)

SSV 082 7.00 207 032 4/1 - 1525 4/17 - 1419 16.0 4*

U(7)

SS1 083 7.25 203 083 4/1 - 1530 4/17 - 1415 16.0 d

B(6)

SS1 084 7.50 196 084 4/1 - 1540 4/17 - 1355 15.9 3*

U(6)

SSV 081 8.25 209 081 4/1 - 1520 4/17 - 1330 15.9 4*

U(6)

SSV 080 8.50 200 080 4/1 - 1515 4/17 - 1347 15.9 4*

U(7)

SSV 079 9.75 205 079 4/1 - 1510 4/17 - 1223 15.9 4*

U(7)

SSV 078 10.50 207 078 4/1 - 1500 4/17 - 1220 15.9 8*

U(7)

SSW 291 10.50 213 291 4/2 - 1820 4/17 - 1250 14.8 1(c)

U(10)

SSW 076 11.50 192 076 4/1 - 1440 4/17 - 1210 15.9 1*

W(6)

N SSW 076-I 11.50 192 077 4/1 - 1440 4/17 - 1210 15.9 1*

B(6)

SS1 208 18.00 193 208 4/1 - 1545 4/17 - 1045 15.8

-2*

W(6)

~.;

.Si 035 1.50 235 035 4/1 - 1215 4/17 - 1400 16.1 2*

W(8)

S1 036 2.00 216

'No Cards Summed - See Tables I and II C(6)

J' Si 290 7.50 228 290 4/2 - 1800 4/17 - 1320 14.8

-2*

U(6)

SV 212 9.00 232 212 4/2 - 1800 4/17 - 1310 14.8 0(c)

T(10)

Si 293 9.75 218 293 4/2 - 1800 4/17 - 1300 14.8 1*

U(10)

SV 292 10.25 230 292 4/2 - 1810 4/17 - 1248 14.8

-2*

U(10)

SV 206 12.75 214

'No Cards Summed - See Tables I and II B(7) hSW 067 4.00 250 067 4/1 - 1330 4/17 - 1130 15.9

-1*

B(7)

(a) Net exposure, expected natural background exposure subtracted.

(b)

Means estimated exposure is less than two standard deviations of the readings of the control dosimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter rot read (lost or destrop d)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

(f) O Indicates st=ed data from two dosimeter cards.

1be accuracy and significance of the number is uncertain.

L Table III-Exposure Data,. cch 31 - April 18,1979 a,e 6 IuI I

Sector l Site lDistancel Azimuth l TLD I l Ibte/ Time l

Date/ Time l Elapsed l Estimated l

Sitc ")l (miles)

Placed Collected Time Expsure

'Iype (days)

(15 rrn) hSi 280 5.50 252 281 4/2 - 1200 4/17 - 1150 15.0 4 * (b)

M(15) hSi 280-I 5.50 252 280 4/2 - 1200 4/17 - 1150 15.0

-2*

C(5)

.hSi 282 E.25 245 283 4/2 - 1200 4/23 - 1200 21.0 0?

W(5)

IG1 282-I 6.25 245 282 4/2 - 1200 4/17 - 1150 15.0 d

W(5)

WSN 284 8.75 246 284 4/2 - 1240 4/17 - 11'20 15.0 0*

W(9) hSV 284-I G.75 246 285 4/2 - 1240 4/17 - 1130 15.0 2*

U(6) bSi 253 9.50 258 253 4/1 - 2300 4/18 - 1700 16.8

-1*

h55) hSV 253-I 9.50 258 255 4/1 - 2300 4/18 - 1700 16.8

-2*

W(5)

WSW 279 9.75 256 279 4/2 - 1300 4/17 - 1205 15.0 0*

U(iG)

WW 236 11.50 243 237 4/2 - 0700 4/17 - 1100 15.2

-3*

B(14) hSV 236-I 11.50 243 236 4/2 - 0700 4/27 - 1200 25.2 d

B(5) hSV 205 13.50 239 205 4/1 - 1335 4/17 - 1040 16.9

@(c) 0 B(7)

WSW 224 16.00 253

'IW Cards Summed - See Tables I and II (f)

C(6) hSi 204 17.00 254 204 4/1 - 1310 4/17 - 1025 15.9

-6*

B(8)

W 071 3.00 273 071 4/1 - 1330 4/17 - 1510 16.0 0*

W(4)

W 071-I 3.00 273 199 4/1 - 1330 4/17 - 1510 16.0 4*

W(6) 069 4.00 251 Two Cards Summed - See Tables I and II C(8)

]K i

070 5.00 270 070 d /1 - lano 4/17 - 1515 16.0

-2*

C(5)

W 068 7.50 260

'IW Cards Summed - See Tables I and II W(6) g W

286 9.50 265 286 4/2 - 1315 4/17 - 1215 15.0 2*

W(6) nw 286-I 9.50 265 287 4/2 - 1315 4/17 - 3215 15.0

-3*

W(8) c}i 270 14.00 277

./0 4/2 - 1700 a/18 - 1700 16.0 0*

UNK CR 270-I 14.00 277 271 4/2 - 1700 4/18 - 1700 16.0

-1*

UNK W

202 15.50 265 202 4/1 - 1210 4/17 - 0945 15.9

-3*

C(7)

W 203 16.50 270

'IW Cards Summed - Sae Tables I and II C(6) htM 037 1.75 286 037 4/1 - 1312 4/17 - 1405 16.0 4*

B(6)

WM 037-I 1.75 286 200 4/1 - 1312 4/17 - 1405 16.0 1*

B(5) h!M 216 6.00 287 216 4/2 - 1300 4/18 - 0900 15.8

-1*

C(6) h!M 216-I 6.00 287 217 4/2 - 1300 4/18 - 0900 15.8-1*

C(6)

MM C99 6.25 287 099 4/1 - 1903 4/17 - 1600 15.9 6 (c)

C(8)

(a) Net exposure, expected natural background xposure subtracted.

(b)* Means estimated exposure is less than two standard deviations of the readings of the control dosimeters.

(c) Readirq questionable due to dvsimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

(f) O Indicatea cumed data from two dosimeter cards.

Ine accuracy.md significance of the number is uncertain.

L Table III-Exposure Data,

.ch 31 - April 18, 1979

.7 Sector l Site lDistancel Azimuth l TLD i l Date/ Time l

Date/ Time l Elapsed l Estimated (a)l Site *}l I

(miles)

Placed Collected Time Exposure Type (days)

(15 ra)

MM 099-I 6.25 287 100 4/1 - 1905 4/17 - 1600 15.9

@ (b) 2*

C(5) htM 278 6.50 284

'No Cards Summed - See Tables I and II (f)

U(12)

.MM 288 7.75 288 288 4/2 - 1400 4/17 - 1530 15.1

-1*

U (7) ital 288-I 7,75 288 289 4/2 - 1400 4/17 - 1530 15.1 2*

B(6)

MM 072 8.50 294 072 4/1 - 1730 d

B(3)

MM 220 8.50 284 220 4/2 - 1330 4/23 - 1200 21.0 d

W(6)

MM 220-I 8.50 284 221 4/2 - 1330 4/23 - 1200 21.0 d

W(6)

NM 218 9.25 287 218 4/2 - 1345 4/23 - 1200 21.1 d

B(6) htM 218-I 9.25 287 219 4/2 - 1345 4/18 - 1030 15.9 2*

B(6) htM 228 9.25 303 228 4/1 - 1050 4/18 - 0945 17.0

-7 (c)

B(8) htM 228-I 9.25 303 230 4/1 - 1050 4/18 - 0945 17.0 d

B(8)

MM 073 9.75 284 073 4/3 - 1610 4/17 - 1545 16.0 2*

B(8)

MM 234 9.75 299 235 4/1 - 1820 4/18 - 0920 16.6

-4*

W(8) h?M 234-I 9.75 299 234 4/1 - 1820 4/18 - 0920 16.6

-5**

B(7) htM 074 10.50 299 074 4/1 - 1845 4/18 - 0910 16.6 0*

B(8)

MM 272 11.25 297 272 4/2 - 1700 4/18 - 1700 16.0 1(c)

UNK MM 272-I 11.25 297 273 4/2 - 1700 4/18 - 1700 16.0

-2 (c)

UNK g

u MM 268 17.00 298 268 4/2 - 1700 4/18 - 1700 16.0 0*

UNK Un MM 268-I 17.00 298 269 4/2 - 1700 4/18 - 1700 16.0 0(c)

UNK MM 264 25.00 288 264 4/2 - 1700 4/18 - 1700 16.0 0*

UNK

.MM 264-I 25.00 288 265 4/2 - 1700 4/18 - 1700 16.0 2*

UNK IM 113 5.00 318 113 4/1 - 0025 4/26 - 1200 25.5 d

C(5)

IM 113-I 5.00 318 114 4/1 - 0025-4/26 - 1200 25.5 d

C(5)

IM 254 7.50 320 254 4/1 - 2125 4/18 - 1100 16.6 2*

U(12)

IM 144 7.50 326

'Iwo Cards Summed - See Tables I and II

@ (c)

U(6) tM 115 8.00 310 115 4/1 - 0035 4/18 - 1145 17.5 3*

C(6)

IN 115-I 8.00 310 116 4/1 - 0035 4/18 - 1145 17.5 9*

C(6)

IM 251 9.50 321 251 4/1 - 2100 4/17 - 0900 15.5 1*

U (12)

IM 231 9.75 304 231 4/1 - 1120 4/18 - 0935 16.9

-4 (c)

B(8)

IM 231-I 9.75 304 232 4/1 - 1120 4/18 - 0935

9

-6*

B(8)

(a) Net exposure, expected natural background exposure subtracted.

(b)* Means estimated experure is less than two standard deviations of the readings of the control dosimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

(f) O Indicates sunmed data from two dosimeter cards. 'Ibe accuracy and significance of the ntraber is uncertain.

~...

y X""WWIsliF51fM&NGQQM27dd51Tj]M&MMWS@d1 MUM??FO3NhPfi Table III-Exposure Data,

.ch 31 - April 18, 1979 j8

=

I Sector l Site lDistancel Azimuth l TLD i l Date/ Time l

Date/ Time l Elapsed l Estimated ")l Site (e) g (niles)

Placed Collected Time Exposure Type (days)

(15 mR)

IM 117 10.00 311 117 4/1 - 0100 4/18 - 1100 17.4 9 * (b)

C(5)

IM 117-I 10.00 311 118 4/1 - 0100 4/18 - 1100 17.4 11(c)

C(5)

IM 256 10.50 316 256 4/1 - 2100 4/17 - 0900 16.5

-2 (c)

U(12) tM 233 10.50 305 233 4/1 - 0900 4/18 - 0925 17.0

-4*

B(10)

IM 258 11.00 311 258 4/2 - 1700 4/17 - 1700 15.0 1*

C(Utm)

M 258-I 11.00 311 259 4/2 - 1700 4/17 - 1700 15.0 1(c)

C(Urs)

IM 266 11.25 321 266 4/2 - 1700 4/17 - 1700 15.0 1*

W(UIE)

IM 266-I 11.25 321 267 4/2 - 1700 4/17 - 1700 15.0 6*

W(Ulm) tM 260 11.25 325 260 4/2 - 1700 4/17 - 1700 15.0 0(c)

W(Ulm) tM 260-I 11.25 325 261 4/2 - 1700 4/17 - 1700 15.0 2 (c)

W(Ulm) tM 229 11.50 312 229 4/1 ~ 2200 4/18 - 1030 16.5

-4*

C(5) tM 201 14.50 309 Wo Cards Summed - See Tables I and II

@ (f)

C(7)

IM 211 17.00 320 211 4/1 - 1115 4/17 - 0913 15.9

-1*

W(8) tam 107 2.75 348 107 3/31 - 2250 4/18 - 1310 17.6 6 (t)

C(5) rJ2M 107-I 2.75 348 108 3/31 - 2250 4/18 - 1310 17.6 14 C(5) v4eu 101 3.25 348 101 3/31 - 2200 4/18 - 1200 17.6 11 B(6)

U72M 101-I 3.25 348 102 3/31 - 2200 4/18 - 1200 17.6 1*

C(6)

_ UtM 109 5.00 337 109 3/31 - 2317 4/18 - 1130 17.5 3*

C(5)

' 't#M 109-I 5.00 337 110 3/31 - 2317 4/18 - 1130 17.5 6*

C(10) fIJM 143 6.25 331 wo Cards Summed - See Tables I and II

@ (c)

WS(4) tam 145 7.50 336 145 4/1 - 1828 4/17 - 1700 15.9 3*

U(5) 12M 145-I 7.50 336 146 4/1 - 1828 4/17 - 1200 32.2 d

C(5) trav 147 8.00 337 147 4/1 - 1843 4/17 - 0930 15.6 9*

U(6) ttM 252 8.25 344 252 4/1 - 2054 4/17 - 0900 15.6 7(c)

U(12) 12M 148 10.00 342 148 4/1 - 1900 4/17 - 0945 15.6 3*

U(6) takt 149 10.50 331 149 4/1 - 1920 4/17 - 0945 15.6 11 (c)

B(6) taw 149-I 10.50 331 150 4/1 - 1920 4/17 - 0945 15.6 7*

B(6) tam 225 11.00 344 225 4/1 - 1830 d

U(7) t#H 262 13.00 342 262 4/2 - 1700 4/17 - 1700 15.0 1*

Utm ta M 262-I 13.00 342 263 4/2 - 1700 4/17 - 1700 15.0' 1*

U:E (a) Net exposure, expected natural background exposure subtracted.

(b)

Means estimated exposure is less than two standard deviations of the readings of the control dosimeters.

(c) Reading questionable due to dosimeter damage (d) Dosimeter not read (lost or destroyed)

(e) T - Tree, U - Utility Pole, C - Cinder Block, B - Brick, W - Wood, S - Sign, M - Metal (Feet above ground)

(f) O Indicates summed data from tw> eosimeter cards. 'Ibe accuracy and significance of the number is uncertain.

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DOSI ETRY PROJECT YOE FOOD AND DRUC ADilINISTRAT?ON B_UREAU OF RADIOLOGIC.\\L HEALTil Locations of monitoring sites e

Detectable exposures are shown (m R)

Period of exposure: 3/31/79 - 4/18/79 o r,

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