ML20134P674
| ML20134P674 | |
| Person / Time | |
|---|---|
| Site: | 07000472 |
| Issue date: | 03/14/1965 |
| From: | Churchill B US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20134P533 | List:
|
| References | |
| FOIA-96-529 NUDOCS 9702260078 | |
| Download: ML20134P674 (2) | |
Text
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i UNITED STATES GOVERNMENT Memorandum DATE: June 14, 1965 To
- Files i
B. W. Churchill, 1sotopes Branch}
FROM Division of Materials Licensing (,
a TELEPHONE CALL TO JAY MENEFEE, H RSHAW CHEMICAL CWPANY, CLEVELAND, ORIO,
SUBJECT:
MAY 5, 1965 1'
Harshaw's application dated March 19, 1965, included a request fo distribute Americium 241 calibration sources to persons (1) specifically licensed, (2) generally licensed under 30.21(a),10 CFR 30, and (3) generally licensed under 30.21(e).
I explained that 30.21(a) did not include provisions for Americium 241 and that 30.21(e) appeared to be more applicable to placed j
l disc sources than to sources consisting of Americium 241 bound in a l
The purpose of the discussion was to obtain 4;intillation crystal lattice.
information to determine if the crystal sources could qualify for general I
license distribution under 30.21(e).
l The crystal sources could not be subjected to the prototype tests of 30.24(n),
l 10 CFR 30, because (1) the active surface cannot be wiped without melting the j
However, each crystal crystal and (2) the crystal cannot be soaked in water.
i is hermetically sealed, either in a metallic crystal housing or in a phototube Mr.
assembly, to prevent damage from the moisture content of the atmosphere.
l Menefee said he would submit a proposal for prototype testing and quality control of the sealed crystals. This would effectively constitute a request for exemption from the test requirements of 30.24(n) as there would then be no radioactive surface to wipe and he wouldn't want to soak even the sealed (crystals range in price from $100 to $30,000). Mr. Menefee said unit Americium 241 content would normally range from 0.001 to 0.5 microcurie, but not greater than 5 microcuries.
Mr. Menefee said the purpose of the Americium 241 "suberystal" was to provide He felt that gain calibration and stabilization for the #intillation system.
this would qualify the sources under 30.21(e)(3)(v) in that stabilization could be thought of as continuous calibration.
Mr. Menefee stated that all such crystals would be of one of the four types described in the submitted drawings. This includes one line assembly in which the crystal and photomultiplier tube are sealed into one unit and These latter three designs in which the crystals are independently sealed.
can be changed from one tube to the other by the user, and will be provided 2he crystals are sensitive to with' a storage container when not in use.
mechanical and thermal shock with the largest and most expensive being the Danaged crystals are returned to Harshaw as the expensive most sensitive.
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4 June 14, 1965 i Memo to Files He said standard model numbers crystalline material can be recovered.
for the would be a problem in view of the large number of custos designs He sug-detector systems and that each crystal had a different number.
f the gested that each model number include a numeral to i testing, or quality control.
- ment, With respect to labeling, Mr. Menefee stated that the h
i crystals, too small for labeling, would be stored in a labeled conta ner.
The feasibility of a petition for exemption of the crystal sources was not discussed, l
1
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