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目的在意外中子照射情况下,快速给出探测器的探测效率,利用24Na能谱分析法估算中子剂量。方法使用Genius-2000 GeomComposer软件实现对探测器的效率刻度。结果可快速给出探测器对3 ml血样中1.368 MeV能量的γ光子的探测效率,其数值为4.05271×10-2,软件给出的误差为4.0%。对中子照射样品的剂量估算值为1.94～2.82 Gy,算术平均值为2.38 Gy,剂量值的不确定度约为20.07%。结论将无源效率刻度方法应用在人体血液24Na能谱分析法中,可提高估算速度。
Objective In the case of accidental neutron irradiation, the detection efficiency of the detector is given rapidly and the neutron dose is estimated by 24Na energy spectrum analysis. The method uses the Genius-2000 GeomComposer software to calibrate the detector efficiency. The results show that the detection efficiency of the detector for γ photons with energy of 1.368 MeV in 3 ml blood sample can be quickly given, which is 4.05271 × 10-2. The software gives an error of 4.0%. The dose estimates for neutron irradiation samples ranged from 1.94 to 2.82 Gy with an arithmetic mean of 2.38 Gy and an uncertainty of about 20.07% for the dose value. Conclusion The passive efficiency calibration method used in human blood 24Na spectrum analysis method, can improve the estimation speed.