ML20214L492

From kanterella
Jump to navigation Jump to search
Environ Radiation Surveillance Rept for Aug 1985 - Jul 1986
ML20214L492
Person / Time
Site: North Carolina State University
Issue date: 07/31/1986
From: Harris R
North Carolina State University, RALEIGH, NC
To:
Shared Package
ML20214L484 List:
References
NUDOCS 8609100195
Download: ML20214L492 (13)
v • d • e


Text

.. .

Attachment A RADIATION PROTECTION OFFICE .

NORTH CAROLINA STATE UNIVERSITY

~

ENVIRONMENTAL RADIATION SURVEILLANCE REPORT FOR THE PERIOD 08/01/85 - 07/31/86 I

i RALTON J. HARRIS f' ENVIRONMENTAL llEALTH PHYSICIST f

0609100195 860829 PDR ADOCK 05000297 PDR ..

R

'd.

1. INTRODUCTION During the months of May and June 1986, an increase in environmental-radioactivity levels was observed for the North Carolina State University-Campus. This has been attributed to a release of fission products from a reactor, on 26 April 1986, in the Ukraine in the Unio'n of Soviet Socialist Republics.r,This reactor was located at Chernobyl (latitude 51.17N, longi-tude 30.15E) n' ear Kicyevskoy Vodokhranilishche (a reservoir). The 1100 MW

~

light-water graphite-moderated reactor sustained a serious graphite fire and some de. gree of core damage. Consequently, airborne fission and activa-tion products were observed in the United States, as well as other countries (See Appendix A). However, the activity levels observed by this laboratory were always found to be several orders of magnitude below the MPC values for air and water contamination. In the months following June 1986, the activity levels on the NCSU Campus were observed to return to those prior to the Chernobyl incident.

During the reporting period, there have.been continuing problems with aging instrumentation in this laboratory. As a consequence, much of the data in this report is due to the willingness of Ms. Shirley Bell of the State of North Carolina Radiation Protection Section (Division of Facility Services) to count samples collected by this -laboratory. However, as of 19 June 1986, the NCSU Radiation Protection Office has installed a new low-background proportional counter for environmental sample counting.

With the anticipated acquisition of an improved system for gamma spectral analysis, this laboratory will have essentially achieved state-of-the-art capabilities for environmental surveillance.

2. AIR MONITORING (Tables 2.2 and 2.3)

Tables 2.2 and 2.3 give the gross beta activities and gamma activities of selected nuclides in units of fC1 m~ . Cross beta activities are determined by counting Mil 11 pore air filters which are collected on a weekly basis. The beta data given in Table 2.2 for each monitor station is a mean value obtained from four samples. Gamma activities are reported

~3 in fCi m for each month. However, following the Chernobyl incident, gamma activities have been reported on a weekly basis until the levels were ob-served to decrease. ,

.mm-w=.+-w w -wm+-m-aw mma-

2

3. MILK (Tables 3.1 and 3.2)

Monthly analyses of cows' milk from the Campus Creamery have consistently shown concentrations oi Sr-90 that are well below the FDA's Preventive Pro-

-1 tective Action Guide value of 0.009 microcuries liter for infants. The data of Table 3.2 shows that the I-131 activity level.is below this'labora-

-1 tory's detection ILmit of 2.0 picoCuries liter . The FDA's Preventive PAG for I-131'In' milk for infants is 0.015 microcuries liter-1 ,

4. SURFACE WATER (Table 4.1)

Due to extended downtimes for instrumentation, surface water collections and analyses have been reduced in frequency from monthly to quarterly. The data of Table 4.1 give gross alpha and beta activities for water from Rocky Branch at points where it enters and exits the campus. The data is indicative of low levels of radioactivity.

5. GROUND WATER (Table 5.1)

Cround water samples were taken from drilled wells (Nos. 2, 8, 11, 14, and 20) surrounding the New Burial Ground near Carter-Finley Stadium. Cross alpha, beta, and gamma activities are given. All values are well below the MPC for water.

6. SOIL (Table 6.1)

Surface soil samples were collected at two. locations on 10 June 1986.

One near the corner of Morrill Drive and Western Boulevard (Location #1) and one near the NCSU Bell Tower (Location #2). No significant levels of radio-activity were observed.

7. VEGETATION (Table 7.1)

Samples of grass were taken on 10 June 1986 at the same locations as the soil samples. Analysis for gross alpha, gross beta, and specific nuclides revealed no significant levels of radioactivity.

3 Table 2.1 Location of Air Monitor Stations Site Direction Distance Elevation (meters) (meters)

Broughton Southwest 125 -17 David Clark Labs West 500 ,

-18 Library Northwest 192 +11 Riddick "F' Southeast 99 -14 Withers Northeast 82 .

-6 1

Direction - Direction from Reactor Stack 2

Distance - Distance from Reactor Stack 3

Elevation - Elevation Relative to the Top of the Reactor Stack

~

Table 2.2 Aerially Transported Cross Beta Activity (fCi m i 1 c)

DATE DCL BROUGHTON LIBRARY RIDDICK UITHERS 8/85 43.4 i 4.9 40.4 i 4.6 32.9 4.4 46.3 i 4.8 40.1 i 4.7 9/85 37.4 1 4.5 38.8 i 4.4 39.7 t 4.7 40.1

  • 4.7 36.7 i 4.4 10/85 38.7 i 4.5 33.0 i 4.4 41.8 1 4.6 45.3 a 4.9 44.2 i 4.5 11/85 39.8 A 4.6 35.9 i 4.5 42.8 i 4.8 39.9 i 4.7 34.0 i 4.5 12/85 35.0 A 4.6 37.0 1 4.7 40.2 A 4.7 45.3 i 4.7 39.8 4.5 01/86 40.1 i 4.7 42.9 t 4.9 40.0 4.7 36.0 i 4.5 33.9 i 4.4 02/86 31.1 1 4.4 46.7
  • 5.0 37.3
  • 4.4 39.9 t 4.5 35.8 i 4.5 03/86 19.6 1 3.7 34.8 i 4.4 35.0 4.4 29.5 i 4.1 40.0 i 4.7 04/86 50.6 i 5.2 41.8 A 4.8 45.4 i 5.0 30.4 A 4.2 39.2 i 4.6 05/86 64.3 a 5.3 71.5 i 5.6 84.9 6.3 65.6 i 5.3 89.7 i 6.5 06/86 114.2 i 8.1 124.1 1 8.6 208.6 311.8 100.0 i 7.5 89.9 i 6.9 07/86 21.9 i 3.9 18.2 A 3.8 28.5 4.2 35.1 t 4.5 20.2 A 3.9 4

4 Table 2.3 ' Aerially Transported Gamma Activity (fCi m' i l o)

SAMPLING PERIOD NUCLIDES ACTIVITY (fCim-Jdilo)

Cc-144 < 2.0 08/85 < 1.0 08/85 Ce-141 Ru-103 < 0.5 08/85 .

08/85 Ru-106 < 5.0 08/85 #, Zr-95 <-1.0 Nb-95 < 0.5 08/85 Ce-144 < 2.0 09/85 < 1.0 09/85 Ce-141 Ru-103 < 0.5 09/85 < 5.0 09/85 Ru-106 Zr-05 < 1.0 09/85 < 0.5 09/85 Nb-95 Ce-144 < 2.0 10/85 < 1.0 10/85 Ce-141 Ru-103 < 0.5 10/85 < 5.0 10/85 Ru-106 Zr-95 < 1.0 10/85 < 0.5 10/85 Nb-95 Ce-144 < 2.0 11/85 < 1.0 11/85 Ce-141 Ru-103 < 0.5 11/85 < 5.0 11/85 Ru-106 Zr-95 < 1.0 11/85 < 0.5 11/85 Nb-95 Ce-144 < 2.0 12/85 < 1.0 12/35 Cc-141 Ru-103 < 0.5 12/85 < 5.0 12/85 Ru-106 Zr-95 < 1.0 12/85 < 0.5 12/85 Nb-95 Ce-144 < 2.0 01/86 < 1.0 01/86 Ce-141 Ru-103 < 0.5

' 01/86 < 5.0 01/86. Ru-106 Zr-95 < 1.0 01/86 < 0.5 01/86 Nb-95 Ce-144 < 2.0 02/86 < 1.0 02/86 Ce-141 Ru-103 < 0.5 02/86 < 5.0 02/86 - Ru-106 Zr-95 < 1.0 02/86 < 0.5 02/86 Nb-95 i

,- , - - - -,r --- , , . , , - , , _ , .

. 5 Table 2.3 Aerially Transported Gamma Activity (fCi m~ i 1 c), continued SAMPLING PERIOD _ NUCLIDES ACTIVITY (fCi m-J 1 c) 03/86 Ce-144 < 2.0 03/86 Ce-141 < 1.0 03/86 Ru-103 . < 0.5 03/86 Ru-106 < 5.0 03/86 ,,,, Zr-95 < 1.0 03/86 .

Nb-95 < 0.5

'04/86 Ce-144

< 2.0 04/86 Ce-141 < 1.0 04/86 Ru-103 < 0.5 04/86 Ru-106 < 5.0 04/86 Zr-95 < 1.0 04/86 Nb-95 < 0.5 05/06/86 - 05/13/86 I-131 62 i 14 05/06/86 - 05/13/66 Cs-137 24 6 05/06/86 - 05/13/86 Co-57 3.4 i 1.8 05/06/86 - 05/13/86 Sn-113 8.3 5.3 05/06/86 - 05/13/86 Sr-85 6.3 t 4.1 05/06/86 - 05/13/86 Cs-134 19 5 05/06/86 - 05/13/86 Be-7 140 i 44 05/06/86 - 05/13/86 Nb-95 242 i 85 05/13/86 - 05/20/86 I-131 26 i 10 05/13/86 - 05/20/86 Cs-137 28 3 05/13/86 - 05/20/86 Sn-113 3.9 i 2.8 05/13/86 - 05/20/86 C.-134 16 i 4 05/13/86 - 05/20/86 Be-7 180 i 28 05/13/86 - 05/20/86 Zn-65 14 i 5 05/13/86 - 05/20/86 Na-22 3.1 i 2.5 05/13/86 - 05/20/86 _

Fe-59 6.6 + 5.1 05/13/86 - 05/20/86 Ru-106 35 i 16 05/20/86 - 05/27/86 I-131 14 i 15 05/20/86 - 05/27/86 Cs-137 23 i 6' 05/20/86 - 05/27/86 Sn-113 6.6 i 4.5 05/20/86 - 05/27/86 Be-7 41 27 05/20/86 - 05/27/86 Co-57 2.7 2.3 05/20/86 - 05/27/86 Ce-144 16.2 15.8 05/27/86 - 06/03/86 I-131 15 i 6 05/27/86 - 06/03/86 Cs-137 17 5 i

05/27/86 - 06/03/86 Be-7 91 42 05/27/86 - 06/03/86 Co-57 4.4 2.4 05/27/86 - 06/03/86 Fe-59 19 i 12 05/27/86 - 06/03/86 K-40 (natural product) 257 i 26

6

~

Aerially Transported Ganana Activity (fCi m~ i 1 a), continued Table 2.3 SAMPLING PERIOD NUCLIDES ACTIVITY ,

(fCi m-3 i l o) '

06/03/86 - 06/10/86 I-131 12 i 7 06/03/86 - 06/10/86 Cs-137 16 i 5 06/03/86 - 06/10/86 Be-7 ,

47 i 25 06/10/86 - 06/17/86 I-131 < 2.0 06/10/86 .Q6/17/86 Cs-137 9i5 06/10/86 - 06/17/86 Ru-103 < 1.0 06/10/86 - 06/17/86 Ru-106 - - < 5.0 06/17/86 - 06/24/86 I-131 < 2.0 06/17/86 - 06/24/86 Cs-137 < 5.0 06/17/86 - 06/24/86 Ru-103 < 1.0 06/17/86 - 06/24/86 Ru-106 < 5.0 06/17/86 - 06/24/86 Cc-141 < 1.0 06/17/86 - 06/24/86 Ce-144 < 2.0 07/86 I-131~ < 2.0 07/86 Cs-137 < 5.0 07/86 Ru-103 < 1.0 07/86 Ru-106 < 5.0 07/86 Ce-141 < 1.0 07/86 Cc-144 < 2.0 07/86 Zr-95 < 1.0 07/86 Nb-95 < 0.5 t

. 7

-1 y ,)

Table 3.1 Strontium-90 in Cows' Milk (pci liter DATE ACTIVjTY (fCi m i 1 o)

August 1985 3.9 1.0 September 1985 4.3 A 0.5

~ , .

October 1985 3.3 i 0.3 November 1985 3.7 i 0.3' January 1986 4.4 0.5 February 1986 4.6 1 0.7 March 1986 4.7 i 0.8 April 1986 3.6 0.4 May 1986 4.1 i 0.5 June 1986 4.9 0.9 July 1986 5.0 1.0

-1 Table 3.2 Iodine-131 in Cows' Milk (pci liter i 1 c)

DATE ACTIVITY (fCi m~ i 1 c)

August 1985 < 2.0 September 1985 < 2.0 October 1985 < 2.0 November 1985 < 2.0 December 1985 < 2.0 January 1986 < 2.0 February 1986 < 2.0 March 1986 < 2.0 April 1986 < 2.0 May 1986 < 2.0 June 1986 < 3.0 July 1986 < 3.0 i

l l

_ _ _ _ _ _ _ __ _ . _ - _~ _

8 f

Table 4.1 Surface Water Activity (pCi liter" 1 o)

DATE LOCATION GROSS ALPHA GROSS BETA Third Quarter 1985 ON 0.2 i 0.1 4.0.i 0.4 0FF 0.2 1 0.1 3.1 0.3 Fourth Quarter 1985 ON 0.3 i 0.1 4.2 1 0.4

~,.., 0FF 0.4 i 0.1 3.8 1 0.4 First Quarter 1986 ON 0.5 1 0.1 , 4.3 i 0.4 0.4 0FF 0.1 4.1 i 0.4 ON 0.3 i 0.1 3.1 i 0.3 Second Quart,er 1986 0FF 0.3 0.1 3.3 0.3 ON < 1.0 4.3 0.9 Third Quarter 1986 0FF < 2.0 5.2 1.1 4

4

  • 9

~

Table 5.1 Ground Water Activity (pCi liter 2 a)

Sample Date - 15 October 1985 A

LOCATION NUCLIDE

-1 (pCi liter 2 o)

Well # 02 Ce-139 ,

3.2 i 1.9 Well # 02 K-40 104 + 31

~,...

Well #08 '

- Gross Alpha 0.9 1 Well #08 Gross Beta 4.1 i 1.3 Well #08 Cs-137 .2.0 1.6 Well #08 K-40 107 '25 Well #08 Ra-226 49 i 7 Well #11 Gross Alpha 2.2 i 1.3 Well #11 Gross Beta 4.5 i 1.3 Well #11 Ra-226 15 i 3 Well #14* K-40 65 25

  • Note: This is a background well, i.e. Well #14 Well #20 Nb-95 4.0 i 2.0 Well #20 Cs-137 2.7 2.8 Well #20 K-40 207 i 34 Well #20 Ra-226 42 i 7 I

I l .

i r

l l

  • 10

~-

e *

~

Table 6.1 Soil Specific Activity (pCi g i 1 o)

LOCATION NUCLIDE ACTIVITY

~1 (pCi g .i 1 o)

  1. 1 Alpha ,

< 1.0

  1. 1 Beta 24.3 i 41.7
  1. 1 * ', Cs-137 0.95 0.04
  1. 1 K-40 . -

5.7 i 0.3

  1. 1 Ra-226 0.83 i 0.05
  1. 1 -

Th-232 1.1 i 0.08

  1. 2 Alpha < 3.0
  1. 2 Beta < 1.0
  1. 2 Cs-137 1.2 0.03
  1. 2 K-40 3.1 i 0.2
  1. 2 Ra-226 0.57 i 0.03
  1. 2 U-235 < 0.1
  1. 2 Th-232 0.38 i 0.05

~

Table 7.1 Vegetation Specific Activity (pCi g i 1 o)

LOCATION NUCLIDE ACTIVITY

~

(pCi g i 1 o)

  1. 1 Alpha < 1.0
  1. 1 Beta 6.8 i 3.3
  1. 1 Be-7 1.2 0.3
  1. 1 I-131 0.05 0.03
  1. 1 Cs-134 0.08 i 0.02
  1. 1 K-40 5.3 1 0.5
  1. 2 Alpha < 1.0

. #2 Beta < 5.0 i

^

  1. 2 Nb-95 < 0.05
  1. 2 I-131 < 0.2
  1. 2 K-40 ,

1.9 .0.3 I

l h

d a

~-

. ~ , - ~ - . . -e.y- - . - , - , - - , - - , - , --,_.,.a ....w..-- --- -,,-.--.------,-e - - , . . . . . . - - . - - , - , , ,

11

. ; ~~

APPENDIX A Appendix A contains some environmental data from Sweden obtained a few days af ter the Cherttobyl reactor accident.

~,...

t a

t b

APPENDIX A CllERNOllYl. i)ATA FROM SWEDEN

' In September 1985 I was a member of a group of PSE&G employees that sisited two reactor sites in Sweden, Oskarshamn and Fonmark. Forsmark site was the first western location o learn of the Chernobyl disaster. Through my contacts in Sweden I hase obtained some of the early air and deposition resulis in that country.

AIR CONTANilNATION (lly/m2)

Osi arshamn 4/2N/N6 liarschack 4/29/F6 Stockholm Co-60 3-4 390 Te-9'>m 24 - 45 O.I -

Ru-103 . N - In ,

1 131 99 - 430 0.19 10 1132 690 -1200 ""' , I l 133 15 - 79 '

Cs-134 18 - 27 0.(L8 Cs-137 31 - 51 0.06 I Ila-140 4 - 35 1.a- 140 17 Np-239 0.02 Cs-136 4 - 99 GROUND CONTANilNATION (llq/m') (.R %N lily m')

Stockholm 4/2N/86 l'orsmark 4/2N/N6 liarschack 4/29/N6 Ringhals 4/28-29/N6 Nb-95 3500 Co-60 2 Zr-95 15(X) 37(kl Nb-95 37 92 Mo-49 4200 Zr-95 50 66 -130 Te-99m 3S00 Te-99m 79 44 . l(x)

Ru-103 1500 41(N) Ru 103 23 -220 Rh- 105 320 1-131 46 350 -680 1-131 65(x) II(xx) Te-132 110 - 140 Te-132 17(N) 1-132 54 100 - 130 1 132 9700 1-133 93 - 190 1-133 1200 Cs-134 37 Cs-134 2(k) 2(M) Cs 137 69 Cs-137 350 870 lla 140 180 lla 140 19th) 55(W) 1.a-140 43 1200 1.a-140 4(W N) Ce-141 78 Ce-141 2l00 43no Np 239 277 370 - 610 Np-239 20 h ki Mo>9 a 120 WATEl: (Ram Sm ia, e) (15q ,13 (fppsala 4/29.N6 4'3 hen 6 l'orsmark 4 30 N6 Nb-95 94 Ru-103 5800 800 M ll K fl!4 'l) 1-131 222(XX) 25(xWN) 15(kNN) liarschack 4/29/N6 l-132 74(kk) 8(XMW) 1 133 22200 24 Cs134 27(N) 360 To99m 0.3 Cs137 74(X) 4700 640 1 131 2 Ila-l40 37o Cu137 0.4 1.a.140 17(X) 410 Np-239 20 - 30 Of coune any Registered Radiation Protection Technologist can consesi hom 114 io PCi. Anyone wishing a complete copy of the telefas data from Sweden please con.iaet lhe NRRP1 INeemise S eretary.

..mnibuiat M: John J. Molner '

EDITORS COMMENT I has e, as well as lhe !!Qet.tive Secretary, a very, very in-teresting copy of Nuclear Energy, Oct 1981 Vol 20 No 5 page 385 which discuwes " Graphite-Water steam-generating reactors in the USSR aml Nuclear Power Sta-tions in the Sosiet linion." Space did not allow me to in-corporate these articles in the NiiWS. If you would like a copy of these MOST INTERiiS'IING articles about the Chernobyl reactors please coniaet me or the lisecutise Secretary for a copy: ihe cost should be around $1.(X) per

Retrieved from "https://kanterella.com/w/index.php?title=ML20214L492&oldid=3089586"