【摘要】 文章叙述了所建立的4πγ电离室活度测量标准装置的结构和性能。说明了用¹²⁵I作为探针,对源瓶子进行筛选的必要性。电离室共刻度了26个核素,刻度的总不确定度（3σ）在1.2%-4.6%。导出了一条完整的4πγ电离室效率曲线,可用来预言未作过刻度的核素的刻度值。更多还原

【Abstract】 The structure and performance of the 4 πγ ionization chamber substandardestablished are described. The necessity of selecting source vials in accordance withwall absorption fractions using a ¹²⁵I needle source which is used as asensitiveprobe is stated. The chamber is calibrated with 26 radionuclides. Theoverall uncertainties （3 σ） of calibration factors are in range of 1.2--4.6%.A efficiency curve of the chamber is derived and it can be used to predict thecalibration factors of those radionuclides for which the chamber isn’t calibrated.更多还原