ML20126A628
| ML20126A628 | |
| Person / Time | |
|---|---|
| Site: | 05000054, 07000687 |
| Issue date: | 03/17/1992 |
| From: | CINTICHEM, INC. |
| To: | |
| Shared Package | |
| ML20126A622 | List: |
| References | |
| HP-M-37, NUDOCS 9212210153 | |
| Download: ML20126A628 (2) | |
Text
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CINrIQIEN HEAL'm PHYSICS FIOCEDURES ICHECKED BYhdAAJJ U.M/<rn lAPPIWAL ~ L /ME l j /n/9 n TWPINE SWRCE OIECK FOR HPGe OCUUrIIC SYS11MS I
lPAGE 1 OP 2
[/ ' ISSUED l 3/n /?;;L HP-M-37 '
A. PUPlOSE To provide instruction in carrying out the routine source check on the HPGe systems This check is to help ensure validity of data generated on these systems. This it done by verifying the kev per channel (energy calibration), the activity of a knowr standard (efficiency calibration) and the shape of the detected Faks (FLll Width of Half Maximum (FWIN)) .
B. DISCUSSION The Liquid Nitrogen (LN) Dewar for the HKie systems are topped off twice Mr week 9 This provides an opportune time to perform a routine source check of the systems.
$' '_ :, Control charts are kept for kev / channel and calculated activity of a known standard The standard currently in use is source nirber 352-60-1A from Isotcpe Product
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?, Laboratories, Eurbank California. This is a one liter marinelli standard containins '
2.0178 grams of NISP source material SPM 4276C-35 (Sb-125, Eu-154, Eu-155) hereafte:
referred to as the P-3 standard.
C. PROCEDURE The mininun frequency that this source check is to be perforned is every tine that i HPCe LN dewar is tcpped of f.
- 1. Wait at least 30 minutes af ter filling the LN dewar.
- 2. Remove the plastic bag cover from the crystal, place the spacer ard P-3 standan on the crystal.
- 3. Count the P-3 sto for "O seconds and analyze it using the SIDMIX. LIB library back decaying to 1200 acurs 9/1/88. -
- 4. Enter the activh.ies of the Sb-124, Sb-125 and Eu-154 into the appropriab j control charts, from the Summary of luc'. ides section of the report.
Enter the peak channel nutbers tor the 123.1 kev, 723.3 kev, and 1274.5 ke' I peaks into the appropriate control charts, from the identified peak sunmar: ;
section of the report.
Also, enter the FMN from the last column of the identified peak surrary for th 123.1, 723.3 and 1274.5 kev peaks into the appropriate control charts.
- 5. If any value falls within the warning range notify senior tecnnical staff.
If any value falls outside of the control limit Jo not put the detector i question back into service!
03/07/S HP/317E 02/20/9 9212210153 921215 PDR ADOCK 05000054 p PDR 1 -- _ _ _ _ _ _ - - - - - - - - _ - - - - - - - - - . - _ _ _ _ _ - - _ _ - _ _ ---
I DA7E IPREPARED BY2 ' d#faj ;/se/h ;
CINTIGIE24 BEAL'IB MlYSICS PIOCEDURES lOECKED BY .kwJ74W2] r#.v4?2 -
lAPPPOV* L #i A ls ' I_:,/ n f3 2__
[//' ISSUED l S/d/u POCRIlE SOURCE GIEG FOR HPGe COUNTIlG SYSTFNS lPAGE 2 OF 2' HP-M-37_
- 6. If vne or more of the control charted c%ta points fall outside the control limit ONE (1) - attempt is to be made by the technicians to bring them back int <
acceptance. This involves performing an auto pole zero as detailed below:
- a. Leave the P-3 standard on the detector.
- b. Typ Alt-S, ENTER then Alt-L, ENTER.
- c. Type I to scroll up to the Auto PZ entry ard type E!EER.
- d. Wait 30 minutes and rerun the P-3 standard,
- e. If one or more data points still falls outside of the control limit do not continue to use the detector. Label the shield as "Out of Service" anc notify senior technical staff of the situation.
Any detector exceeding a control limit will be kept out of service until it can b+
brought back into limits.
A new set of control charts must be started at each new calibration with the P-:
standard.
Refer to HP-M 54 for required frequercies fer source checks and the details of how the
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warning range and control limits are 6etermined.
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03/07/9 HP/317E G2/20/9