Redetermination of γ Emission Probability for ⁸⁷Kr

Uncertainty of result for wall effect correction and efficiency calibration was bigger in our previous experiment about ⁸⁷Kr. In order to solve the problem, the experiment equipment was improved, and wall effect was exactly corrected in present work. Radioactive concentration of ⁸⁷Kr was measured by internal gas proportional counters, the result is 100.87（1±0.86%） Bq/mL. The source box which can exactly calibrated the efficiency of HPGe detector was designed again. Emission probability of ⁸⁷Kr 402.6 keV γ-ray was determined to be 49.46%（1±1.9%）.