微量热γ谱中钚和镅光子分支比的改进
Improved Plutonium and Americium Photon Branching Ratios from Microcalorimeter Gamma Spectroscopy
摘要：
光子分支比是核材料保护和衡算等活动的关键输入数据，因为它们可以从伽马射线强度的测量中提取材料成分。这些分支比的不确定性通常是组成测定中不确定性的限制性来源。在这里，我们使用高统计，高分辨率（~60- 70 eV的半峰全宽，在100 keV）伽马射线光谱获得使用微量热计传感器，以大大减少不确定性的11钚（238钚，239钚，241钚）和241 Am分支比重要的材料控制和问责制和核取证的能量范围为125 keV至208 keV。我们表明，一个分支比的不确定性减少了三倍以上，四个分支比的不确定性减少了2{3}倍。
英文摘要：
Photon branching ratios are critical input data for activities such as nuclear materials protection and accounting because they allow material compositions to be extracted from measurements of gamma-ray intensities. Uncertainties in these branching ratios are often a limiting source of uncertainty in composition determination. Here, we use high statistics, high resolution (~60-70eV full-width-at-half-maximum at 100 keV) gamma-ray spectra acquired using microcalorimeter sensors to substantially reduce the uncertainties for 11 plutonium (238Pu,239Pu,241Pu) and 241Am branching ratios important for material control and accountability and nuclear forensics in the energy range of 125 keV to 208 keV. We show a reduction in uncertainty of over a factor of three for one branching ratio and a factor of 2{3 for four branching ratios.
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