ML20040E575
| ML20040E575 | |
| Person / Time | |
|---|---|
| Site: | 07002626 |
| Issue date: | 09/01/1969 |
| From: | NAVY, DEPT. OF |
| To: | |
| Shared Package | |
| ML20040E569 | List: |
| References | |
| 0967-874-9010, 20113, 967-874-9010, NUDOCS 8202050128 | |
| Download: ML20040E575 (16) | |
Text
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- ~s NAVSHIPS 0967-874-9010 INSTRUCTION MANUAL for AN/UDM-7B ALPHA RADIAC
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CALIBRATOR SET l
l DEPARTMENT OF THE NAVY BUREAU OF SHIPS ed 1 SEPTEMBER 1969
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Effective Pages NAVSHIPS 0967-874-9010 FRONT MATTER
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4 LIST OF EFFECTIVE PAGES PAGE CHANGE IN PAGE CHANGE IN NUMBERS E FFE CT NUMBERS EFFECT Title Page Original 3-1 to 3-2 Original 11 to 111 Original 4-1 Original 1-0 to 1-3 Original 5-0 Original i
2-0 to 2-2 Original I
ATOMCHEM CORPORATION Fairchild Court, Plainview, New York 11803 Contract: N00039-68-C-3576 Dated 1 December,1967 Errors found in this publication (other than 1
obvious typographical errors), which have not been
' s' corrected by means of Temporary Cctrections or Permanent Changes should be reported. Such report should include the complete title of the publication and the publication number (short title); identify the page and line or figure and location of the error; and be forwarded to the Electronics Publications Section of the Bureau of Ships.
All Navy requests for NAVSHIPS electronics l
publications listed in the current issue of NAVSANDA Publication 2002 " Requisitioning Guide and Index of Forms and Publications", Cognizance Symbol I, or in a subsequent issue of the Electron-ics Information Bulletin should be directed to the appropriate Forms and Publications Supply Point.
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11 ORIGINAL
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FRONT MATTER NAVSHIPS 0967-874-9010 Contents Hlustrations - Tables e
TABLE OF CONTENTS Paragraph Page SECTION 1.
GENERAL INFORMATION 1-1 Scope 1-1 1-2 Functional Description........................
1-1 1-3 Quick Refe re nce Data.........................
1-1 1-4 E quipment Supplied..........................
1-3 1-5 Procurement Data 1-3 SECTION 2. OPERATION 2-1 Functional Ope ration.........................
2- 0 2-2 Ope rating Procedu re s.........................
2-1 SECTION 3.
MAINTANANCE 3-1 Contamination Test Procedures....................
3-1 SECTION 4.
TROUBLESHOOTING 4-1 Source Dam age............................
4-1 4-2 Calibration Malfunction........................
4-1 g
SECTION 5.
PARTS LIST 5-1 Replacement Parts..,.......................
5-1 LIST OF ILLUSTRATIONS Figure Page 1-1 AN/UDM-7B, Alpha Radiac Calibrator Set 1-0 1-2 AN/UDM-7B, Alpha Radiac Calibrator Set Carrying Case 1-2 1-3 AN/UDM-7B, Source Holder Containing Typical Pu-239 Alpha Source.
1-2 1-4 AN/UDM-7B, Accessory Drawer 1-2 2-1 AN/UDM-7B, Source A Exposed in Positioning Well 2-1 3-1 Sketch - Source Holder Showing Several Suggested Wipe Paths...
3-1 3-2 Sketch - Top Plate of Source Positioning Well-Wipe Area Should Include Cross Hatched Paths....................
3-1 LIST OF TABLES Table Page 1-1 Equipment Supplied..........................
1-3 1-2 Shipp ing Data.............................
1-3 2-1 Ideal Meter Readings for 'Ihree Alpha Radiac Sets..........
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ORIGINAL 111 y
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Figure NAVSHIPS 0967-874-9010 AN/UDM-7B I
GENERAL INFORMATION j
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AN/UDM-7B Alpha Radiac Calibrator Set
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1-0 ORIGINAL
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AN/UDM-7B NAVSHIPS 0967-874-9010 Paragraph GENERAL INFOIU1ATION 1-1 m
SECTION I GENERAL INFORMATION 1-1.
SCOPE 1-2.
FUNCTIONAL DESCRIPTION The Alpha Radiac Calibrator Set AN/UDM-7B (Figure 1-1), which is similar to the AN/UDM-7A, is designed to provide a calibration check for the following types of Alpha Radiac Sets:
- a. AN/PDR-54
- b. AN/PDR-56 c.
AN/PDR-60 The AN/UDM-7B consists of five basic components:
(1) Hardwood carrying case (Figure 1-2).
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(2) Aluminum cabinet used for housing source and accessory drawer.
(3) Aluminum source holders, housing Pu-239 alpha sources (Figure 1-3).
(4) Alpha Sources, Pu-239, on plastic discs.
(5) Accessory drawer for attenuators, card of calibration check meter readings, NAVSHIPS No. 0967-874-9010 Instruction Manual, tweezers, and adjustable polae positioner (Figure 1-4).
1-3 QUICK REFERENCE DATA
- a. The AN/UDM-7B contains two Pu-239 radioactive sources, labeled A and C respectively with an approximate accuracy of + 5%.
b.
Source Order of DPM A
107 C
105
- c. The alpha sources consist of Pu-239 in resin de70 sited on plastic discs ap-proximately 12-1/2 inches in diameter. A minimum of 90% af the alpha particles are emitted with energies of 4 to 5.15 MEV.
d.
Exposed Source Area is 4" x 10".
L ORIGINAL 1-1
Figure NAVSHIPS 0967-874-9010 AN/UDM-7B 1-2 GENERAL INFORMATION
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AN/UDM-7B, Source Figure 1-2.
AN/UDM-7B Alpha Radiac Calibrator Set Carrying Case Holder Containing Typical Pu-239 i
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Figure 1-4.
AN/UDM-7B Accessory Drawer Containing: A - Attenuators; B - Card for meter calibration check readings; C - Instruction Manual; D - Tweezers; E - Adjustable Probe Positioner 1-2 ORIGINAL
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._.-.J AN/UDM-7B NAVSHIPS 0967-874-9010 Paragraph GENERAL INFORMATION 1-3e e.
Attenuator Approx. % Transmission No. I 10.0 No.2 2.5 f.
Adjustable positioner will secure all probes over an exposed source.
1-4.
EQUIPMENT SUPPLIED TABLE 1-1.
EQUIPMENT SUPPLIED Quantity Overall Dimensions
- Per Equip.
Nomenclature Height Width Depth Volume
- Weight
- 1 AN/UDM-7B, Alpha 2-3/32 13-25/32 13-17/32 0.23 17 Radiac Calibrator 1
Carrying Case 4-1/32 14-7/8 15-1/16 0.47 7-1/2
- Dl; ensions are in inches, volume in cubic feet, weight in pounds.
1-5.
PROCUREMENT DATA
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TABLE 1-2.
SHIPPING DATA No. of Volume Length x Width x Height Weight Boxes Contents (Cu. Ft.)
(Inches)
Packed (Pounds) 1 AN/UDM-7B,
.8
.9 17 x 17 x 6 30 Alpha Radiac Calibrator with Carrying Case e
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ORIGINAL 1-3
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Paragraph NAVSHIPS 0967-874-9010 AN/UDM-7B 2-1 OPERATION SECTION II OPERATION 2-1.
FUNCTIONAL OPERATION The AN/UDM-7B is equipped with radioactive sources containing Plutonium-239 (an alpha emitter) embedded in a resin-type carrier and deposited on plastic discs. Alpha particles are generally known for their high ionization capabilities and relatively short ranges. They are readily absorbed in any material, losing their energies by excitation and ionization of the absorber atoms. A sheet of paper, a few inches of air or an sluminum foil 0.0015 inch thick are but a few examples of absorbers which would completely stop an alpha particle.
The penetrating distance or the range of an alpha particle is related to its initial energy. For alpha radiation having energies between 4 and 7 MEV their range in air can be computed from the formula.
3/2 R = 0.12E where R = mean range of particle in inches of air E = energy of particle in MEV.
The alpha particle of Pu-239 has an energy of 5.15 MEV.
Due to the readily absorbable nature of alpha particles, it is necessary to bring the probe as close to the source as possible to obtain a maximum reading. Positioning of the probe is effected by the use of a positioner and in certain cases an attenuator. Instructions on their use are given in paragraph 2-2a.
In addition to the positioner and attenuator, each AlphaRadiac Calibrator is supplied with a table of meter readings to be used in the calibration of the aforementioned alpha radiac sets. These values were obtained theoretically, adjusting for radiac efficiency, source self absorption and air absorption.
Table 2-1 of this section shows meter rg,adings for ideal source Plutonium-239 con-4 centrations of 10 ug per square meter and 10 ug per square meter. The two sources are used for calibration check of all scales of the radiac equipment listed.
TABLE 2-1.
IDEAL METER READINGS FOR THREE ALPHA RADIAC SETS Accessory in Source Meter Reading Radiac Set Positioning Well Source A Source C 2
104 ug/m 102 ug/m2 AN/PDR-54 Positioner (1) 310 x 100 Positioner + Attenuator 1 (1) 310 x 10 Positioner + Attenuator 2 780 x 100 780 x 1 AN/PDR-56 Positioner 675 x 1M
.675 x 10K Positioner + Attenuator 1 675 x 100K 675 x 1K AN/PDR-60 Positioner (1) 300 x 100 Positioner + Attenuator 1 300 x 1K 300 x 10 Positioner + dttenuator 2 750 x 100 750 x 1 (1) Meter reads off scale, j
2-0 ORIGINAL
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AN/UDM-7B NAVSHIPS 0967-874-9010 Paragoph OPERATION 2-2 3-2. OPERATING PROCEDURES I
- a. Sequence of Operation. When calibrating a radiac set with the AN/UDM-7B, perform the following steps.
(1) Ualock carrying case. Place cover aside. The unit need not be removed from the case.
(2) Remove cover from opening for probe positioner and where Decessary the l
proper attenuator from accessory drawer.
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(3) Incate probe positioner and attenuator over opening.
(4) Mount probe in positioner and secure with movable arms of positioner.
(5) Carefully remove desired source from the unit.
(6) CAREFULLY remove cover from source holder. (Source is now exposed.
DO NOT TOUCH OR GOUGE). Place source cover on the side where saran-covered surface l
will not be touched.
(7) SIlde EXPOSED source into source positioning well. Figure 2-1 illustrates the exposed source in the positioning well, j
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AN/UDM-7B, Source A Exposed in Positioning Well ORIGINAL 2-1
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Paragraph NAVSHIPS 0967-874-9010 AN/UDM-7B 2-2a (8)
OPERATION (8) Check radiac instrument using the figures provided in the table of meter readings, located in the accessory drawer.
(9) If the set reading is different from the one indicated by the table, use the procedures in the instruction book for the particular radiac set to adjust the set reading to the desired value.
(10) Upon completion of the radiac calibration check, remove the positioner and with the aid of tweezers carefully remove the attenuator from the source and replace in the accessory drawer. (DO NOT RUB OR GOUGE THE SOURCE).
(11) Withdraw the source holder from the source positioning well and carefully replace the cover on the sourca.
(12) Replace the source in the proper shelf.
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2-2 ORIGINAL
AN/UDM-7 B NAVSHIPS 0967-874-9010 Paragraph MAINTENANCE 3-1 SECTION III MAINTENANCE 3-1.
CONTAMINATION TEST PROCEDURES a.
Surrounding Surfaces Wipe testa should be performed at least once every three months. Wipe the sur-rounding surfaces of the source and positioning well, as suggested in Figures 3-1 and 3-2.
DO NOT WIPE SOURCE. Count each wipe for one hour in a low-background area, using a GM tube with a mica window thickness of 1.8-2.4 mg/cm2 (type 7840 or TGC-1), and a conventional scaler. If the count rate minus background is greater than 32 CPM per 10 sq.
inches of wipe, but less than 64 CPM per 10 sq. in., take a second wipe and count. If the count rate minus background still remains within the limits 32-64 CPM per 10 sq. in.,
completely tape the cover over the source and spray paint
- the contaminated surface. If the count rate exceeds 64 CPM per 10 sq. in, follow the "on source" test procedure described below.
Summary Contamination Limits: 32 to 64 CPM (above background) per 10 sq. inches of wipe If greater than 64 CPM (above background) per 10 sq. inches of wipe, see "on source" test.
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Sketch - Source Holder Showing Figure 3-2.
Sketch - Top Plate of Source Several Suggested, Wipe Paths Positioning Well-Wipe Area Should Include Cross Hatched Paths k
- such as Crystal Clear Acrylic No.1301 Krylon, Borden Chemical Company, New York, N.Y. (TT-L-0048).
ORIGINAL 3-1
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Paragraph NAVSHIPS 0967-874-9010 AN/UDM-7B 3-lb.
MAINTENANCE 3
b.
On Source DO NOT WIPE THE SOURCE. Place a piece of paper toweling on the source.
CAREFULLY place a heavy object such as an alpha radiac instrurient on the toweling.
After an hour, count the paper toweling using the counting procedure described above. If the count rate is 96 CPM or greater (including background), the source should be replaced.
c.
Physical Contact with Source In the event the hands come in contact with the surface of the source, the follow-ing procedures should be carried out even though there is no measurable contamination from the source.
(1) Allow cool water to run over hands without rubbing same for about thirty creonds.
(2) Wash hands lightly using soap, and rinse.
(3) Notify your radiological officer.
6 3-2 ORIGINAL 7._,_.-.._,....,.
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AN/UDM ~S NAVSHIPS 0967-874-9010 Paragraph TROUBLESHOOTING 11 1
SEC'IION IV TROUBLESHOOTING 4-1.
SOURCE DAMAGE a.
The AN/UDM-7B contains two Pu-239 alpha sources with the following approxi-mate total activities:
Source A - - - 800 ug Source C - - -
8 ug Caution should be exercised in handling the sources. Since the radioactive source is composed of a thin resin-type carrier which can be gouged, physical contact of objects i
with the source surface should be avoided. If severe damage at the ends of the long axis of the exposed area does occur, 'the sources can be rotated in their holders according to in-structions given below (see paragraph 4-lb.).
If damage is suspected, the effect may be checked by comparing readings of a calibrated radiac set with readings obtained before the damage occurred.. The procedure described in paragraph 4-lb. should be carefully followed when handling the sources.
i DO NOT TOUCH THE EXPOSED SOURCE SURFACE WITH HANDS.
DO NOT RUB OR GOUGE THE ATTENUATORS, POSITIONER, OR RADIAC PROBE ON THE SOURCE.
b.
Instructions for Turning Source in Holder If there is severe damage to the source at the ends of the long axis of the exposed area (up to two inches from the ends), the source may be rotated in its holder to expose a fresh source area. Remove the cover from the source holder. (The source is now exposed.
DO NOT 10UCH OR GOUGE.) Place the source cover on the side where the saran surface will not be touched. Camfully mmove the eight screws from the top plate of the source holder. Wearing plastic or rubber gloves, lift the top plate away from the holder and care-fully turn it over and lay it aside so that the under surface is facing up, and cannot be ac-l cidentally touched. Then turn the source 900 in the source holder. Replace the top plate gently, being careful not to rub the source surface. Remove the gloves and replace the screws in the top plate. The source may now be used as previously described.
4-2.
CALIBRATION MALFUNCTION When it becomes apparent that an Alpha Radiac Set does not meet the expected values I
as shown on the card of calibration check meter readings the following sequence should be followed before performing Alpha Radiac Set repair:
a.
Verify Alpha Radiac Set type being calibrated.
l b.
Verify correct Accessory is used for Alpha Radiac Set being calibrated, c.
Verify correct Source Holder is being used for Alpha Radiac Set being calibrated.
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ORIGINAL 4-1
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Paragraph NAVSHIPS 0967-874-9010 AN/UDM-7B 5-1 PARTS LIST
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SECTION V PARTS LIST 5-1.
REPLACEMENT PARTS The following list of parts fully describe the replacement part requirements for the AN/UDM-7B Radiac Calibrator Set, Atomchem Corporation Drawing No. DO-44.
DETAIL ATOMCHEM NO.
ASSEMBLY ASSEMB LY DRAWING NO.
REQUIRED VENDOR DATA CARRYING DO-0748 1
CASE Nameplate B O-0745 1
Catch 4
Eagle Lock #05918F Handle 2
Brainard Mfg. #234 Corner 4
Brainard Mfg. #480 Foot 4
Lavelle Rubber #707RW HOUSING DO-44 1
Instruction Plate ' BO-0744 1
Positioner Holder DO-0724 1
Thumb Screw AO-0736 2
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Cover CO-0725 1
ACCESSORY DO-0746 1
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DRAWER Nameplate CO-0743-7 1
Knob AO-0737 2
Probe Positioner DO-0741 1
Attenuator No.1 CO-0728-1 1
Attenuator No. 2 CO-0728-2 1
Fisher Sci. #8-875 Tweezers NAVSHIPS 0067-874-9010 l
Operating Manual i
Calibration Card SOURCE DO-0742-1 1
DRAWER ASSEMBLY Nameplate CO-0743-6 1
l, Nameplate AO-0750 1
Source Cover CO-0718 1
Knob AO-0737 2
l DO-0742-2 1
SOURCE j
DRAWER ASSEMB LY Nameplate CO-0743-5 1
Nameplate AO-0750 1
Source Cover CO-0718 1
Knob AO-0737 2
5-0 ORIGINAL l
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NAVSHIPS NO. 0967-874-9010 USER ACTIVITY COMMENT SHEET (Fold on dotted lines on reverse side, staple in corner, and send to Bureau of Ships, Code 240, Washington 25, D.C.)
PROBLEM AREA:
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Both sides of this form to be reproduced locally as required.
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Fold DEPARTMENT OF THE NAVY POSTAGE AND FEES PAID BITREAU OF SHIPS NAVY DEPARTMENT WASHINGTON 25, D.C.
OFFICIAL BUSINESS CHIEF, BUREAU OF SHIPS PUBLICATIONS AND INFORMATION RETRIEVAL BRANCH
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DEPARTMENT OF THE NAVY WASHINGTON 25, D.C.
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