~(88)Kr γ射线发射几率的测量

利用轻质海绵为填充材料,采用小体元分割法制备混合标准源,完成了高纯锗γ探测器对放射性气体源效率的校准。采用活性碳低温吸附法从235 U的裂变产物中快速提取放化纯88 Kr,并制成气体密封源,采用上述校准的高纯锗γ探测器对其进行了实验测量。利用放射性暂时平衡原理,通过子核88 Rb的活度计算得到了88 Kr的活度,进而计算出88 Kr各γ射线的发射几率,其结果的不确定度与评价值相比明显降低。

Measurement of γ-ray Emission Probability of 88Kr

The HPGe detector efficiency calibration of gas source was made by mixing the reference standard source, and the filling material is lightweight sponge and the small voxel partition method was used. The ⁸⁸Kr of radiochemical purity from ²³⁵U fission products was quickly extracted using activated carbon cryogenic absorption method, and was made into a gas sealed source. The ⁸⁸Kr of radiochemical purity was measured by the calibrated HPGe detector. Using the radioactive temporary balance principle, the ⁸⁸Kr activity was deduced from the ⁸⁸Rb activity, which is the decay daughter of ⁸⁸Kr. The absolute branching ratios of ⁸⁸Kr were gotten through calculation. Compared with the evaluation value, the uncertainty of data decreases significantly.