Preliminary calibration of the hard X-ray imager LaBr3 probe

The main purpose of this paper is to calibrate the detection efficiency and energy linearity of a hard X-ray imager (HXI), one of the payloads on the ASO-S satellite. In this experiment, HPGe calibrated by radioactive source was used as the standard detector, and the experimental device used was a double crystal calibration device. The experimental method is to first measure the single energy peak of the corresponding energy point with a standard detector, and then use the HXI LaBr3 crystal detector probe to obtain the same single energy peak. It should be noted here that in order to eliminate the statistical fluctuations and other factors, we set the detection time of both detectors to 1000 seconds. Then, the dobule crystal parallelism is detuned (ie, non-parallel) to measure the unfiltered background and the electronic noise. Finally, the open source software Root is used to perform relatively clean single-energy X-ray beam data obtained after subtracting the background data of the beam.