Evaluation of Various Collimators for UF6 Gas Pipe Measurement
On-line gamma measurements of the enrichment of uranium in UF6 gas in pipes is carried out as part of international safeguards. The 186 keV line from 235U is measured in NaI detectors. One complication in the analysis is that the 186 keV line also comes from the (time-dependent) amount of uranium-bearing material deposited on the interior walls of the pipe. This contribution has to be subtracted before the enrichment of the gas can be calculated. The relative contributions to the total 186 keV count rate from the gas and from the deposit depends on the amount of deposit, but also on the type of collimation/shielding used between the NaI detector and the gas pipe. Several different collimation/shielding designs have been simulated in order to determine which provides the best performance.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; U.S. Department of State, Washington, D.C. (United States)
- DOE Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1499312
- Report Number(s):
- LA-UR-19-22117
- Country of Publication:
- United States
- Language:
- English
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