4πγ电离室活度测量标准装置

A 4πγ IONIZATION CHAMBER SUBSTANDARD FOR ACTIVITY MEASUREMENTS

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~(125)I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。
- 4πγ电离室 ,
- 活度标准 ,
- 性能和刻度 ,
- 效率曲线 ,
- γ辐射核素
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 ~(125)I 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.
- 4πγ ionization chamber ,
- ,
- Substandard ,
- ,
- Performance and calibration

[1]	Rytz, A., Int. J. Appl. Radiat. Isotopes, 34． 1047(1983).
[2]	中国计量科学研究院编译,放射性核素计量学,256(1976) .
[3]	顾继青等,上海计量测试技术,2,10(1981) .
[4]	Woods, M. J. et al., Int. J. Appl. Radiat. Isotopes, 26, 488(1975).
[5]	BIPM, INC--1(1980).
[6]	Schrader, H. and Weib. H. M., Int. J. Nucl. Med. and Bial, 10, 121(1983).
[7]	Weiss, H. M., Nucl. Instrum. Methods, 112． 291(1973).
[8]	NCRP Report, 58, 262(1978).
[9]	Dale, J. W. G., Int. J. Appl. Radiat. and Isotopes, 10, 72(1961).
[10]	NCRP Report, 58, 322(1978).
[11]	Lederer, C. M. and Shirley, V. S., Table of Isotopes, 7th Edition, 1978．