ML20126A646
| ML20126A646 | |
| Person / Time | |
|---|---|
| Site: | 05000054, 07000687 |
| Issue date: | 09/24/1992 |
| From: | CINTICHEM, INC. |
| To: | |
| Shared Package | |
| ML20126A622 | List: |
| References | |
| HP-M-43, NUDOCS 9212210160 | |
| Download: ML20126A646 (2) | |
Text
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IMME CUJNIS W E!NTRONENTAL IAB HPGe Dtimflu6 IPAGE 1 & 2 HF M-43 IURKSE:
To provide instructica for Envirornental Lab Technicians on how to recurd data on the control charts for routine standard (P-3) and blank counts on the Environmental Lab High Purity Germanium (IGCe) garca spectrcceters.
Also included are instructions on what to do when the data exceeds the control ranges set.
DISCUSSION:
In order to maintain a high confidence in the results from analytical cquipment Quality Control (QC) samples, including routine standards and blanks, must be introduced into the sample stream.
Limits are then set on their results and put onto a control chart to nonitor any trends or abrupt deviations in systs performance.
In this way the results of rample analysis are kept within an acceptable accuracy range.
PROCEDURE:
- 1. Af ter perforuing the routine P-3 and blank counts (daily), analyze the results and print the out.
(Refer to HP-M-37 and HFM-51 for these count procedures.)
- 2. Please note that the contrcl charting must be performed as soon as the printed results are available to ensure that subsequent sample counts are of acceptable quality.
- 3. E-3 's a.
P(cord, in pen, the centroid energy and peak shape for the 123.09 kev, 723.32 kev and 1274.48 kev peaks on the appropriate sheets for the detector in question.
The energy must be recorded frcm the " Identified Peak Summary" section of the printcut (see attached printout).
b.
Fecord the activity for Eu-154, Eu-155 and Sb-125 on the corresponding sheet for the detector in question.
Record the activity level f rom the " Time Corrected Activity" column of the " Summary of tbclides" section of the printout.
Make sure that the activity is decayed to Septerber 1, 19D at 12:00 hours (see attached printout).
If any one of these parameters exceeds the 3 c-limit on the control chart, note c.
the occurrence in the log for that system, verify that the Liquid Nitrogen filling schedule has been follcwed and perform two " Pole Zeros" and recount the standard.
d.
If the parameter exceeds the 7 control limits on the control chart a second time, take the detector out 1 service (put an "Out of Service" sign on the Shield), note _ the occurrence he log for that system, and notify both the CC Technician and the Environmeu.:1 Lab Supervisor.
Do rot put the systen back into service without approval f rcm both of these people, e.
Draw a solid line f rom one days results to the next.
If a day has more than one result record all entries, number them in order of occurrence, and connect then with dashed lines.
Near the top of the graph, on that date, reewd the cause.
Example: For pole zero enter P2.
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For days with no result put an "X" cn the base line of the graph, abcNe the dates.
For results off the scale, mark the sheet below the date with an arrow pointing down and run connecting lines from the previous result to the edge of the page, also with an arrow pointing down.
- 4. Blanks a.
Pecord, in pen, the activity for Co-60, Sb-125, Cs-137, Ce-144, Bi-214, Fb-214 and Th-234 on the corresponding sheet for the detector in question.
Record the activity level f rom the " Time of Count Activity" column of the "Surnmary of 1.bclides" cection of the printout. Ib back decay is required.
b.
If the following occurs, notify Senior Envirorcental staff or QC:
- i. Any isotope exceed the 3 c limit twice in a row on the sme detector.
ii. Two isotopes exceed the 3 cr limit at the same time on the same detector, iii. If control charts or other data indicate a trend in an unacceptable direction over a pericd of a week.
Three or more isotopes out of control on the same detector requires that the c.
detector be taken out of service (see 3.d.) and notification made as above.
tDIE:
All control charts will be reviewed by the Quality Control Group on a weekly basis.
HP/144 09/01/9:
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