Detector for measuring radioactive rays and sensitivity calibration method thereof

According to the detector for measuring radioactive rays and the sensitivity calibration method thereof, the plateau characteristic curve of each sub-detector is measured, and the benefit reduction state of the sub-detectors caused by partial pressure in a combined detector can be accurately obtained. By changing the state of the combined detector, a multivariate linear equation about the mutual shielding effect parameters of the sub-detectors can be obtained, and the benefit reduction caused by the mutual shielding effect to the sub-detectors can be accurately obtained in combination with obtained benefit reduction state parameters caused by detector partial pressure. Therefore, the benefit reduction caused by the voltage division of the detector and the benefit reduction caused by the mutual shielding effect of the sub-detectors are decoupled, the influence of the voltage division offset and the shielding effect on the performance of the combined detector can be quantitatively determined, and the sensitivit