一种因参考光源强度变化导致的热释光剂量测量结果偏差的修正方法

A Method for Correcting Measured Value Changed Varied with the Intensity of Ref-lighting in the Measurement of Thermoluminescence

在热释光剂量测量中,参考光源强度是影响测量结果的重要因素之一。对参考光源强度的调整往往通过调整测量仪器的高压来实现,但调高高压参数会导致测量仪器暗电流增加,进而导致测量值偏差增大。频繁的调整高压参数,也可能会使仪器的稳定性变差。针对参考光源强度变化导致的测量偏差,提出利用测量时的参考光源强度值与校准测量时参考光源强度值的变化求出相应的修正系数,进行测量结果修正。该方法经标准值样片测量检验,其测量值更准确、误差更小,与标准辐照值的偏差小于5%,表明该方法可行,可在实际工作中应用。

In the measurement of thermoluminescence dose, the intensity of reference light source is one of the most important factors. The adjustment of the intensity of the reference light source is often realized by adjusting the high voltage of the measuring instrument. However, the increase of the high voltage parameter value often leads to the increase of the dark current of the measuring instrument, which leads to the increase of the deviation of the measured value. Frequent adjustment of high-voltage parameters may also make the performance of the instrument worse. In view of the measurement deviation caused by the change of the reference light source intensity, a measurement correction method is proposed, that is, the corresponding correction coefficient is obtained by using the change of the reference light source intensity value in the measurement and the reference light source intensity value in the scale measurement. The method is proved to be more accurate and less error by the test of standard value sample, and is applied in practical work.