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.