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开展了通用公司Typhoon FLA 7000型成像板扫描仪的灵敏度曲线标定实验。利用超短脉冲激光-固体靶相互作用产生的超热电子源同时辐照了成像板与已标定的LiF热释光探测器(TLD),通过相对标定方法得到该扫描仪在光电倍增管不同倍增电压下的灵敏度曲线,并对测得的灵敏度曲线进行了数值拟合。拟合结果表明,灵敏度曲线随电压增大呈双指数规律减小,且与已有文献报道的利用标准放射源标定获得的结果一致。该方法为在无标准放射源情况下成像板扫描仪灵敏度曲线标定提供了一种有效途径。
A sensitivity curve calibration experiment was conducted for the Typhoon FLA 7000 imaging plate scanner from General Motors. The imaging plate and the calibrated LiF thermoluminescence detector (TLD) were simultaneously irradiated by the superheated electron source generated by the interaction of the ultrashort pulse laser-solid target. The relative calibration method was used to obtain the difference between the multiplier of the photomultiplier tube Voltage sensitivity curve, and the measured sensitivity curve was numerically fitted. The fitting results showed that the sensitivity curve showed a double exponential law with the increase of voltage, and it was consistent with the results obtained from the standard calibration of radioactive sources reported in the literature. This method provides an effective way to calibrate the sensitivity curve of imaging plate scanner without standard radioactive sources.