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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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2014, Vol. 35 
