Determination of the emission probability of the principal gamma ray of ~(135)Xe

摘要

The gamma ray emission probability is one of the most important characteristics used in quantifying radionuclides. This article describes in detail the principles and processes involved in the determination of the ~(135)Xe gamma ray emission probability. Gaseous samples of ~(135)Xe were generated by irradiating enriched ~(134)Xe with a thermal neutron flux. The principal gamma ray emission probability of ~(l35)Xe was then determined to be 0.896 ±0.016 (k = 1) by measuring the absolute activity using length-compensated internal gas proportional counters and γ-ray intensity using a high-purity germanium (HPGe) detector.