Calibration of Kα single-photon counting CCD
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摘要: 对三台单光子计数CCD的能量响应特性和探测效率进行实验标定。采用标准放射源对CCD进行照射，将CCD图像进行统计处理后，得到CCD的能量响应曲线。响应曲线近似为线性，不同的CCD响应曲线斜率明显不同。编写了MATLAB程序对多像素事件进行处理，获得CCD的探测效率曲线。在不同的能点处，CCD的探测效率明显不同，在5.1 keV附近探测效率达到最大值。标定结果与XOP软件计算得到的吸收效率理论结果比较一致。该标定结果可用于超强激光打靶产生的K荧光光子产额和能谱的定量精确处理。Abstract: This paper introduces energy response and detection efficiency calibration of single-photon counting CCD by X-ray source. In the calibration experiment, several standard X-ray sources are adopted to radiate forward the CCD detector and the counts occur. Energy response curve of CCD is close to linear, but the curve slope of different CCD is evidently different. The MATLAB program for studying the detection efficiency and the split pixel event is set up. The detection efficiency of CCD changes with photon energy in the range of 3.1-24.9 keV, and the detection efficiency obtained from the calibration experiment is in agreement with absorption efficiency that is offered by XOP software.
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Key words:
- single-photon counting /
- energy response /
- detection efficiency /
- calibration /
- X-ray source
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