成像板扫描仪的灵敏度曲线标定

摘要

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.%The calibration of the sensitivity function of the GE Typhoon FLA 7000 image plate scanner was studied using hot electron in this paper.The hot electron was generated from the interaction of a short pluse laser with a solid target.Both image plate and absolutely calibrated LiF TLD were exposed to the same hot eletron source,and the sensitivity function of the scanner was calibrated relatively by image plate and LiF TLD.The fitting result shows that the sensitivity function of the scanner decreases slowly in two-component exponentail function,which is consistent with the previously reported results obtained by standard radioactive source.This method provides a reliable approach for calibrating the sensitivity function of the image plate scanner.