Measuring SNM Isotopic Distributions using FRAM

Geist, William H.¹ 

[1] Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

关键词: PLUTONIUM 240;    ISOTOPE RATIO;    NEUTRONS;    RESPONSE FUNCTIONS;    PLUTONIUM ISOTOPES;    DATA ACQUISITION;    GAMMA RADIATION;    COINCIDENCE SPECTROMETRY;    CONTROL;    EFFICIENCY;    MULTIPLICITY;    PEAKS;   

DOI  :  10.2172/1227408
RP-ID  :  LA-UR--15-29262
PID  :  OSTI ID: 1227408
Others  :  TRN: US1600092

美国|英语

来源: SciTech Connect

【 摘 要 】

The first group of slides provides background information on the isotopic composition of plutonium. It is shown that ²⁴⁰Pu is the critical isotope in neutron coincidence/multiplicity counting. Next, response function analysis to determine isotopic composition is discussed. The isotopic composition can be determined by measuring the net peak counts from each isotope and then taking the ratio of the counts for each isotope relative to the total counts for the element. Then FRAM (Fixed energy Response function Analysis with Multiple efficiencies) is explained. FRAM can control data acquisition, automatically analyze newly acquired data, analyze previously acquired data, provide information on the quality of the analysis, and facilitate analysis in unusual situations (non-standard energy calibrations, gamma rays from non-SNM isotopes, poor spectra (within limits)).