ML20127E539
| ML20127E539 | |
| Person / Time | |
|---|---|
| Site: | 07002872 |
| Issue date: | 05/23/1983 |
| From: | Balazs B, Ford C, Palko G REUTER-STOKES, INC. |
| To: | |
| Shared Package | |
| ML20127E198 | List: |
| References | |
| RS-SOP-880.2, NUDOCS 8505200110 | |
| Download: ML20127E539 (12) | |
Text
reuterftokes NO. ATTACHMENT 7
.c DATE 2-8-78 PAGE 1 OF 10 REVISION A 5/23/83 PROCEDURE NUMBER RS-SOP-880.2 PROCEDURE FOR WIPE TESTING ALPHA EMITTERS PREPARED BY C. Hubbard Ford Asst. Radiation Safety Officer REVIEWED BY -
Y 6
Bill Balazs rf Engineering Enager APPROVED BY /
al 7 eorge Palko G
Radiation Safety Officer 8505200110 850501 REG 3 LIC70 Vice President - Operations SNM-1826 PDR FORM No.1001
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NO.
DATE 2-8-78 PROCEDURE NUMBER RS-SOP-880.2 PAGE 2-OF 10 PROCEDURE FOR WIPE TESTING ALPHA EMITTERS REVISION.A 5/23/83 REVISION RECORD PAGES DATE OF REVISED DESCRIPTION REVISION Original 2/8/78 REVISION A Per Engineering Change Notice Number 005693 5/23/83-i l
i PORM No.1001
t NO.
o DATE 2-8-78 PROCEDURE NUMBER RS-SOP-880.2 PAGE 3
OF 10 PROCEDURE FOR WIPE!T.ESTING ALPHA: EMITTERS REVISION A 5/23/83 1.0 SCOPE This procedure definiates the method in which radioactive sources are to be wiped, how the wipes are tested, how test results are documented, and the radiation safety procedures to be used. The Reuter-Stokes Radiation Safety Officer (RSO) has the responsibility to see that all sources designated in our several NRC licenses are wiped according to the specified frequency. This procedure also applies to the wiping of work areas, floors, hoods, and air samples from the radioactive materials plating laboratory. The alpha emitting materials used in the plating laboratory are U-235, U-234, and U-233, as described in the referenced SNM license.
2.0 REFERENCED DOCUMENTS 2.1 Reuter-Stokes, Inc., Special Nuclear Material License SNM 1826.
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2.2 Reuter-Stokes, Inc., By-Product Material License No. 34-18156-01.
2.3 Reuter-Stokes Instruments, Inc., By-Product Material License No. 34-18233-01.
2.4 10 CFR 19 Notices, Instructions and Reports to Workers; Inspections.
2.5 10 CFR 20 Standards for Protection Against Radiation.
2.6 10 CFR 30 Rules of General Applicability to Licensing By-Product Mat-erial.
2.7 10 CFR 70 Special Nuclear Material.
PoRM No.1001
M DATE 2-8-78 PROCEDURE NUMBER RS-SOP-880.2 PAGE 4
OF 10 PROCEDURE FOR WIPE. TESTING AI.PHA EMITTERS REVISION A 5/23/83 3.0 SAFETY Only specifically authorized personnel, designated by the RSO, shall perform wipe testing and wiping. These persons shall be monitored with an appropriate film badge and/or dosimeter. All unauthorized personnel shall be kept out of the test and plating labs during wipe testing. Disposable gloves are to be worn by the persons actually performing the wipes. Sources must not come in contact with the hands,or other portions of the body.
4.0 EQUIPMENT AND TOOLS NECESSARY FOR WIPING AND TESTING 4.1 2x geometry flow counter assembly.
4.2 Tank of P-10 gas (Ar-CH4) with regulator and bubbler.
4.3 Ortec Model PC 109 Preamplifier or equivalent.
4.4 Ortec 410 Multimode Amplifier or equivalent.
4.5 (Two) Ortec Model 431 Timer Scalers or equivalent.
4.6 Ortec Model 115 Power Supply.
4.7 Power Designs Power Supply Model 2K20 or equivalent.
4.8 Lead Shielding Bricks.
4.9 Disposable Gloves.
4.10 Forceps.
4.11 Deionized water in 100 mi beaker.
PORM No.1001
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DATE 2-8-78 PROCEDURE NUMBER RS-SOP-880.2 PAGE 5
OF 10 PROCEDURE FOR WIPE TESTING ALPHA EMITTERS REVISION A 5/23/83 4.12 Air Sampler - Union Industrial Equipment Model 600.
4.13 Air Sampler - Mine Safety Appliances Model 5, Part No. 466118.
4.14 Two-three square feet of aluminum foil.
4.15 Q-tips.
4.16 1" filter paper disks.
4.17 Am-241 Standard Alpha Source New England Nuclear Model 300.
4.18 Aluminum Trays for flow counter.
4.19 Filter paper - Whatman No. 41 - 11 cm or equivalent.
4.20 Masking tape.
4.21 Leak Test Kit - RAD Services No. RSLTK-01. (This will replace Q-tips, deionized water, alummum foil and razor blade.)
5.0 RECORD REQUIREMENTS Those radioactive sources designated as ones which must be wiped, will be wiped during the first week of each quarter. At the same time, samples from the plating lab will also be taken. Wipes of workbenches, floors and exhaust hoods shall be taken. Two air samples are to be taken quarterly and during periods of peak activity. The air sampler should be oriented such that samples can be taken with respect to the worker's breathing zone during actual plating. The Union Industrial PORM No.1001
TE 2-8-78 PROCtiDUK6 NUMBER RS-SOP-880.2 PAGE 6
OF 10 PROCEDURE FOR WIPE TESTING ALPHA EMITTERS REVISION A 5/23/83 air sampler is a stationary unit which should be positioned in the immediate vicinity of the plating bath. The Mine Safety Appliance air sampler is a portable unit which snould be clipped to the lapel or collar for continuous monitoring while working with the SNM. Permanent records are to be kept of all wipes taken and test results in such a manner as to provide quick access to legible data.
6.0 WIPING OF SOURCES AND LAB AREAS 6.1 Lay out the aluminum foil, forceps, masking tape, filter paper cut in approximately l" disks and Q-tips. Put on rubber / plastic disposable gloves.
Label the Q-tips or filter paper disks with a piece of masking tape and label the filter paper disks for each source to be wiped. Moisten the Q-tips lightly in the deionized water. (Note: Filter paper disks are preferred, but they must be used if alpha emitting material is suspected or possible).
6.2 Carefully, but firmly, wipe the dampened filter paper disks or tip of the cotton Q-tip over the top, bottom, and sides of the sealed source, or sur-faces of the mounting or storage device on which radioisotope contamination might be expected to accumulate. Since the surfaces of some sealed sources, especially those containing beta emitters, may be made of a thin foil, special care must be taken to avoid puncturing, erroding or otherwise damaging this surface during leak testing, po ms m teos i,
N DATE 2-8-78 PROCEDURE NUMBER RS-SOP-880.2 PAGE 7
OF 10 PROCEDURE FOR WIPE TESTING ALPHA EMITTERS REVISION A 5/23/83 '
6.3 Place the labeled wipes on the aluminum foil until all of the sources, and the lab have been wiped. The lab wipes are to include two wipes from the work area inside the fume hood, two wipes from an outside work area, two wipes from the floor adjacent to the fume hood, and two wipes from the inside of the fume hood in the vicinity of the exhaust filter.
6.4 Using the forceps, put the wipes (Q-tip or filter paper disks) onto the aluminum tray and push the tray into the flow counter. Each wipe must be placed onto a new tray before running the test. Test method, calibration, and calculations are described in the following section. If the source is found to be clean, no counting rate higher than background, the wipe can be disposed of into a normal trash container, if any contamination is evident, the wipe must be discarded into the special 35/55 gallon steel drum designa-ted for disposal of radioactive materials.
6.5 At least one air sample must be taken in the plating lab. Place a fresh filter into the UNICO air sampler and run it for 15-20 minutes. Remove the filter carefully, and with a razor blade cut the filter into four pieces.
Count at least two pieces by placing each individually on its own aluminum tray and pushing it into the flow counter. If contaminated, follow the procedure in 6.4, for contaminated wipes.
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PonM No.1001 1
b NO.
DATE 2-8-78
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PROCEDURE NUMBER RS-SOP-880.2 PAGE 8
OF 10 PROCEDURE FOR WIPE TESTING ALPHA EMITTERS REVISION A 3/23/83]
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7.0 SET-UP AND CALIBRATION OF THE COUNTING SYSTEM 7.1 Hook up the flow counter, P-10 gas, and the electronics according to the diagram in Figure 1. Make sure that the bubbler is connected to the exit gas post of flow counter.
7.2 The flow counter must be purged by flowing the gas at a fast bubble rate for a minimum of 100 seconds.
The Reuter-Stokes preamp should be connected to the flow counter with a short shielded cable.
7.3 The Ortec 410 multimode amplifier should be set with a gain of 9 x 2.75 with 2 ps shaping, input attenuator of 10. The Ortec 431 scaler threshold should be set at approximately 300 my with the sensitivity set at B.P. 0.1 to 1.1 volts.
7.4 Turn the bias supply to the flow counter to 1100 VDC. After the proper purge, take three 100-second counts to determine background and electronic noise level. Change the 300 MV scaler threshold so that the count rate is less than one count per second. Once this setting is made, it is not'to be changed for the duration of the testing.
7.5 Carefully remove the alpha standard Am-241 source from its wooden box with the forceps, and place it on an aluminum tray. Handle the edges of the plastic container holding the source. Do not handle by touching the source with hands or forceps. Push the tray into the flow counter.
PoRM No.1001
b NO.
i DATE 2-8-78 PROCEDURE NUMBER RS-SOP-880.2 PAGE 9
OF 10 PROCEDURE FOR WIPE TESTING ALPHA EMITTERS REVISION A'5/23/83' 7.6 Walt at least 100 seconds for the gas to stabilize again, and take three 100-second counts. Averaging should give a count of 145 cps 1 10 cps. This count rate on the standard is used to calculate the count rate for a reportable contamination.
7.7 The following data is to be used for calculating the level of contamination of wipes and air monitors, and for calculating the count rate equivalent to a reportable contamination of 0.005 tcl from an alpha emitting source.
1.67 x 10' dpm or 2.78 x 10 dps Am = 1 alpha standard 8
2 8
7.51 x 10 curies = 3.7 10" dps/ urie = Am ' standard 1
3.7 x 10 ' dps = 1 curie 5.0 x 10 ' curies a reportable contamination cps (standard) - Background x cps 7.51 x 10 curies
- 5 x 10"' curies x cps = (cps (standard)- Background x 5 x 10~' curies) 7.5 x 10 ' curies x cps is the number of counts which constitute a reportable contamination level. The cps from the standard, and the background will vary slightly with each claibration.
PoRM No.1001
b NO.
DATE 2-8-78 PROCEDURE NUMBER RS-SOP-880.2 PAGE 10 OF 10 PROCEDURE FOR WIPE TESTING:ALPH A' EMITTERS REVISION A 5/23/83..
7.3 The calculation for the total amount of contamination on each wipe is a ratio of counts obtained from a wipe to the counts obtained from the standard Am " alpha source.
2 cps (alpha std), 7.51 x 10 curies Example:
cps (wspe) x curtes x curies = cos(wipe) x 7.51 x 10 curies cps (alpha std) som m.. toot
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l REUTER STOKES INC.
EMERGENCY PROCEDURES FOR RADIOACTIVE PLATING LAB IN THE EVENT OF A SPILL OR OTHER INCIDENT INVOLVING RADI0 ACTIVE MATERIAL, THE FOLLOWING STEPS ARE TO BE FOLLOWED:
1.
IF INCIDENT OCCURS UNDER FUME HOOD, LEAVE FUME HOOD RUNNING AND CONTACT RSO OR ASSISTANT FOR ASSISTANCE AND DIRECTION IN DECONTAMINATION, 2.
IF INCII1ENT OCCURS IN NON-FUME-HOODED AREAS, TURN OFF THE FUME HOODS AND THE VENTILLATION SYSTEM.
1 3.
DO NOT LEAVE THE AREA.
CALL THE RSO, OR ASSISTANT RSO, AT THE NUMBERS LISTED BELOW.
4.
THE RSO OR ASSISTANT RSO WILL SURVEY THE AREA AND PERSONNEL FOR TOTAL CONTAMINATION.
5 DO NOT ALLOW ANYONE INTO CONTAMINATED AREA EXCEPT THOSE PERSONS AUTHORIZED E
a SPECIFICALLY BY THE RSO.
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RADIATION SAFETY OFFICER (RS0)
GEORGE PALK0 EXT 209 HOME PHONE 845-3326 ASSISTANT RSO HUBBARD FORD EXT.218 HOME PHONE 888-0838 l
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- s REUTER STOKES INC.
j EMERGENCY PROCEDURES FOR RADIOACTIVE TESTING LAB IN THE EVENT OF OVEREXPOSURE TO RADI0 ACTIVITY OR OTHER INCIDENT INVOLVING RADI0 ACTIVE MATERIAL, THE FOLLOWING STEPS ARE TO BE TAKEN:
1.
IF THE INCIDENT INVOLVES EXPOSURE OR SUSPECTED EXPOSURE TO RADIATION BE'nND STANDARD LIMITS, LEAVE THE AREA AND CALL THE RSO OR ASSISTANT RSO IMMEDIATELY AT THE NUMBER LISTED BELOW.
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2.
IF THE INCIDENT INVOLVES DROPPING OR OTHERWISE DAMAGING A SEALED SOURCE, OR OTHER CONTAMINATION OF THE AREA OR PERSONNEL BY RADI0 ACTIVE MATERIAL, TURN OFF THE HEATING AND VENTILLATION SYSTEM, AND CALL THE RSO OR ASSISTANT RSO IMMEDIATELY.
3.
REMOVE PERSONNEL FROM THE IMMEDIATE CONTAMINATED AREA, BUT DO NOT LEAVE THE GENERAL LAB AREA.
4.
DO NOT ALLOW ANYONE INTO THE CONTAMINATED AREA WITHOUT EXPLICIT AUTHORIZATION FROM THE RSO OR ASSISTANT RSO.
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5.
THE RSO OR ASSISTANT RSO WILL SURVEY THE AREA AND PERSONNEL FOR TOTAL CONTAMINATION.
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RADIATION SAFETY OFFICER (RS0)
GEORGE PALK0 EXT. 209 HOME PHONE 845-3326 ASSISTANT RSO HUBBARD FORD EXT, 218 HOME PHONE 888-0338
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