低空气比释动能率系列过滤X射线辐射质的测量与研究

以ISO 4037中推荐的低空气比释动能率系列过滤X射线参考辐射为研究对象,设计合理的半值层测量实验,测量获取第一半值层的值;对建立的辐射质,利用碲锌镉能谱仪测量其过滤X射线能谱,将测量得到的脉冲高度谱经过数据处理和转换,计算出平均能量;根据X射线在材料铝和铜中的衰减规律,拟合单能X射线衰减曲线,计算出该系列过滤X射线...

Measurement and Research for the Filtered X-ray Radiation Quality of Low Air Kerma Rate Series

The filtered X-ray reference radiation of low air kerma rate series recommended by ISO 4037 was selected as the research object, the reasonable half-value layer measurement experiment was designed,the values of the first half-value layers were obtained. For the established radiation quality, the filtered X-ray energy spectrum was measured by CdZnTe spectrometer, then the measured pulse height spectrum was processed and converted to calculate the average energy. According to the attenuation law of X-ray in the material aluminum and copper, a single-energy X-ray attenuation curve was fitted to calculate the effective energy of the series of the filtered X-rays. The measured and calculated results were compared with the recommended values, and both are in good agreement. Compared with the half value layer of ISO, the deviations are less than 5.0%.