1. Chengdu University of Technology, Chengdu, Sichuan 610059, China
2. National Institute of Metrology, Beijing 100029, China
3. Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, China
4. China Jiliang University, Hangzhou, Zhejiang 310018, China
Abstract：Before realizing the absolute measurement of the single-energy parallel photon source, it is necessary to calibrate the efficiency of the CdTe detector. The physical model of the CdTe detector was established by using the MCNP5 Monte Carlo simulation program, the intrinsic detection efficiency of the energy point in the 10~260keV energy range was simulated and calculated, the detection efficiency was higher than 75% in the energy range of 10 ~ 60keV. The intrinsic detection efficiency of the CdTe detector was experimentally calibrated with a single energy X-ray device and a HPGe detector. The results show that the simulated efficiency of the CdTe detector is consistent with the experimental efficiency trend in the energy range of 10 ~ 100keV, and the maximum error does not exceed 5.6%. Because the Te element produces escape peaks at 27keV and 32keV, the detection efficiency has a clear downward trend at these two energies. Efficiency calibration of CdTe detector was carried out with 241Am and 133Ba radioactive sources, and the calibration efficiency of radioactive sources with energies of 59.54keV and 81keV was consistent with the measured value of single energy X-ray radiation device.
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2022, Vol. 43 
