The absolute -ray branching ratios (emission probabilities) for 19 prominent peaks in the decay of U are reported with energies ranging from 97 to 366 keV. The branching ratios were obtained from - coincidence measurements, normalized to the singles. The high-purity U material () was separated from its decay products before preparation of a 4.74- uranyl nitrate foil with a 6-mm diameter. This is the first report on the absolute normalization of the branching ratios since 1984 and it is the only measure by - coincidences, where the ratio removes several potential systematic biases. Overall, the results are consistent with the adopted literature and they validate the quantities most relevant to the non-destructive assay of fissile U material, which is relevant to the thorium fuel cycle and associated safeguards.

中文翻译：

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233U α 衰变后突出 γ 射线的绝对分支比

报告了 U 衰变中 19 个突出峰的绝对射线分支比（发射概率），能量范围为 97 至 366 keV。支化比通过重合测量获得，标准化为单支化。在制备直径为 6 毫米的 4.74-硝酸铀酰箔之前，将高纯度 U 材料 () 与其衰变产物分离。这是自 1984 年以来第一份关于分支比绝对标准化的报告，也是唯一通过巧合来衡量的指标，其中该比率消除了一些潜在的系统偏差。总体而言，结果与所采用的文献一致，并且验证了与可裂变铀材料的无损检测最相关的数量，这与钍燃料循环和相关保障措施相关。