| Autor: |
McDonald, Benjamin S., Zalavadia, Mital A., Bensema, Kevin D., Deshmukh, Nikhil, Becker, Eric. M., Smith, L. Eric |
| Předmět: |
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| Zdroj: |
Journal of the Institute of Nuclear Materials Management; 2022, Vol. 50 Issue 1, p43-57, 15p |
| Abstrakt: |
In the Unattended Cylinder Verification Station (UCVS) project, a field trial in 2019 at a fuel fabrication facility resulted in a direct comparison of several gamma-ray detectors and methods for Type 30B UF6 cylinder enrichment assay. The field trial included measurements of 268 unique cylinders that ranged in enrichments (depleted uranium to 4.95 wt.% 235U) and other factors to assess enrichment assay performance. The detectors included two Ritec μSPEC 1500 CZT (15 mm x 15 mm x 7.5 mm hemispherical crystals) detectors, and two φ38 mm x 38 mm LaBr detectors: one with standard Ce dopant and one Ce, Sr co-doped "enhanced" crystal with marginally better energy resolution. Enrichment algorithms included the General Enrichment Meter (GEM) program stewarded by the International Atomic Energy Agency (IAEA), the Square Wave Convolute (SWC) method developed at the Pacific Northwest National Laboratory (PNNL), and a generic region of interest method. Enrichment-assay precision was calculated for 1-, 5-, or 10-minute data acquisition times and compared against the IAEA International Target Values (ITVs) for different detector/algorithm pairs. This paper presents the field trial gamma-ray enrichment assay performance. Only the LaBr detectors analyzed with GEM and the SWC algorithm provided performance consistently superior to the ITVs. The LaBr detectors were significantly larger than the CZT, giving greater detection sensitivity and improved statistical precision, especially for lower enrichments and assay times. The LaBr detectors, specifically the co-doped variant, also had superior temperature stability compared to CZT, which improved their overall performance. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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