A safeguards approach for molten salt reactors: Direct gamma-spectrometry of 233U
نویسندگان
چکیده
Multidimensional gamma-spectrometry is a potential solution for safeguarding future thorium-fuelled molten salt reactors (MSRs). A high-sensitivity system developed at Pacific Northwest National Laboratory (PNNL), the Advanced Radionuclide Gamma spectrometer (ARGO), has demonstrated direct 233 U assay in freshly irradiated fuel samples using dual-detector configuration and 97.1 keV gamma-emission. These measurements were made 1.4 × 10 6 Bq of activity (at 8 fissions), relatively high dead times (10.4%), short count durations ∼ 800 s. Other major emissions also evaluated (42.5 keV, 54.7 146.4 keV), additional to limited (1.96%) Compton suppression, but provided less consistent determination activity. Accurate measurement was its four-coincidence gamma-emissions keV; 42.5 278.1 174.2 219 keV). Further improvements coincidence may be achievable with detector nuclear data. Whilst this demonstration utilized ARGO laboratory system, similar could online safeguards measurements.
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ژورنال
عنوان ژورنال: Nuclear Instruments and Methods in Physics Research
سال: 2022
ISSN: ['1872-9576', '0168-9002']
DOI: https://doi.org/10.1016/j.nima.2022.166467