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Study and Preliminary Results of the 4πγ Well-type NaI(Tl) Crystal Detector |
ZHANG Ming1, YANG Yuan-di1, LIU Hao-ran1,2 |
1. National Institute of Metrology, Beijing 100013, China;
2. China Institute of Atomic Energy, Beijing 102413, China |
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Abstract A 4πγ well-type NaI(Tl) crystal counting device for gamma-ray detection at NIM is introduced. By analyzing the detected gamma spectrum of 60Co, it is found that the sum-peak counting effect is inevitable for nuclei with complex decay scheme using 4πγ well-type NaI(Tl) crystal. Further, a series of test experiments are carried out to investigate the performance of detector by changing the depth of 60Co source in the well. The results reveal that the sum-peak counting rate increases as the source moved to the bottom of the well, and the efficiency for full-energy peak has a slight reduction for the increasing sum-peak effect. Besides, the efficiency is reasonable lower at the mouth of the well-type NaI(Tl) crystal for the smaller solid angle coverage. Moreover, the energy calibration is also effected by the variation of source position.
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[1] 古当长. 放射性核素活度测量的方法和技术[M]. 北京: 科学出版社.
[2] 李琦,常永福,解峰,等.大体积阱式NaI(Tl)探测器的效率计算和测量[J]. 原子能科学技术,2003,37(3):230-232.
[3] 陈宝林,周维妕,谭永康,等. 4πγ电离室活度测量标准装置[J]. 原子能科学技术,1991,25(1):25-31.
[4] 连琦,常永福,李琦,等. 4πγ计数法测量166Hom放射性溶液比活度[J].原子能科学技术,2003,37(4):306-309.
[5] 杨元第,梁珺成,陈靖. 125I放射性溶液活度测量国际比对[J]. 现代测量与实验室管理,2005,(6):3-5. |
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