ML20134N290
| ML20134N290 | |
| Person / Time | |
|---|---|
| Issue date: | 09/08/1995 |
| From: | Steven Baggett, John Lubinski NRC |
| To: | |
| Shared Package | |
| ML20134N285 | List: |
| References | |
| SSD, NUDOCS 9702240062 | |
| Download: ML20134N290 (7) | |
Text
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES j
SAFETY EVALUATION OF DEVICE F
i i
NO.: NR-420-D-847-S DATE:
September 8, 1995 PAGE 1 OF 3 I
DEVICE TYPE:
Clathrate Gas Detector i
MODEL:
Clathrate Gas Detector i
MANUFACTURER /DISTRIBUTORi LFE Industrial Systems Corporation
+
55 Green Street Clinton, MA 01510
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ISOTOPE:
MAXIMUM ACTIVITY:
l I
Krypton-85 100 millicuries (3. 7 GBq).
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2 i
j LEAK TEST FREOUENCY:
6 Months 7
l-1 i
PRINCIPAL USE:
(N) Ion Generator - Chromatography CUSTOM DRVICE:
YES X
NO 9702240062 950929 PDR RC SSD PDR
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-420-D-847-S DATE:
September 8, 1995 PAGE 2 OF 3 DEVICE TYPE:
Clathrate Gas Detector DESCRIPTION:
The Clathrate Gas Detector is designed to detect nitrogen dioxide in air.
Th sensing element is a krypton-85 quinol clathrate source.
The quinol undergoes a chemical reaction with the gas being analyzed, with the ultimate release of krypton-85 gas.
The gas is released by the quinol being oxidized to quinone and in turn the krypton is swept along into the counting chamber.
The counting rate being proportional to the concentration of the oxidizing gas.
The Kr-85 clathrate cell consist of a piece of 0.25" (0.64 cm) teflon tube about 4" (10.16 cm) long.
The Kr-85 clathrate is packed within the tube using fine wire mesh and teflon wool.
The assembly is placed within a cylindrical lead shield and is placed within 7" (17.8 cm) high x 17" (43.2 cm) wide x 13" (33.0 cm) deep aluminum console.
The device contains a visual and audio alarm system.
When concentrations in excess of the preset limit is detected the alarm circuit is activated.
DIAGRAM:
A diagram of the console is showr in attachment 1.
CONDITIONS OF NORMAL USE:
The device is designed to detect concentrations of nitrogen dioxide gas in air and wi3' typically be used in controlled environments suitable for humans.
EXTERNAL RADIATION LEVELS:
There are no measurable radiation levels outside the console.
Radiation levels at the surface of the lead shield are less than 0.3 mR/hr (3 pSv/hr).
A fresh 100 mci source removed from the lead shield produces radiatior. levels of 8 mR/hr (80 Sv/hr) gamma and 20 mR/hr (200 pSv/hr) beta on its surface.
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-420-D-847-S DATE:
September 8, 1995 PAGE 3 OF 3 DEVICE TYPE:
Clathrate Gas Detector LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
- The device may be used by persons specifically licensed by the NRC or an Agreement State.
- Handling, storage, use, transfer, and disposal:
To be determined by the licensing authority.
- The device shall be leak tested at intervals not to exceed 6 months using techniques capable of detecting 0.005 microcurie (185 Bq) of removable contamination.
- This registration sheet and the information contained within the references shall not be changed without the written consent of the NRC.
SAFETY ANALYSIS
SUMMARY
LFE distributed this device prior to 1969.
However, in 1969 the product line was sold and all the information that LFE has concerning the device is contained in this certificate.
LFE will not accept return of the sources.
REFERENCES:
The following supporting documents for the Clathrate Gas Detector are hereby incorporated by reference and are made a part of this registry document.
- LFE's letters dated July 12, 1995, September 16, 1991, and August 6, 1991, with enclosures thereto.
ISSUING AGENCY:
U.S. Nuclear Regulatory Commission 4
Date:
SeDtember 8, 1995 Reviewer:
74 e
n W. L'ubinski Date:
SeDtember 8, 1995 Concurrence:
M#
4'
' Yteven L.Baggett
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-420-D-847-S DA'iT -
September 8,-1995 ATTACHMENT 1 Not Used p sodlin chlortte
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L Flow Meter Pump Main Power FIGURE I CLATHRATE GAS DETECTOR
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INFORMATION RECORD TYPE:
Note to LFE. files for registration certificates made inactive September 1995.
t ORGANIZATION:
LFE DATE:
09/21/95
SUMMARY
Existing AEC/NRC files (registration files, license files, NUDOCS, and archives) concerning these products were examined for inforruation that supports registration of the products. ' Copies of all i
applicable information located is included in this file.
The manufacturer, LFE, was also asked for additional information concerning the products.
However, many of the products have not been distributed for years, or the product lines were sold in the late 1960's, and LFE provided all additional information they have concerning the products.
NRC has transferred the registration certificates to inactive, as requested by LFE, and continues to i
conclude the products'are acceptable for licensing purposes based on AEC's original evaluation of the products and the operational history of the products.
p PERSONS DOCUMENTING THE SIGNATURE:
INFORMATION:
DATE:
/w
^
John W. Lubinski 7
09/21/95 l'
f
(
Steven L. Baggett
/
09/21/95 e
._.