新型诊断剂量仪的能量响应特性研究

摘要

Objective: To carry out comparative study on energy respond characteristics of 4 kinds of medical diagnostic X-ray dosimeters that included general new imported equipment and domestic equipment.Methods: In the standard radiation field of secondary standard dosimetry laboratory(SSDL)of IAEA,substitution method was adopted to complete contrast measurement of 10 kinds of X-ray diagnosis radiations which voltage were 60-150 kV,tube current were 10 mA and 2.5 mmAl was used as filterable addition.Results: The results of energy respond performances of domestic RD-98 diagnosis dosimeter and imported dosimeter indicated that all of these responses of different energy to dose were within ±5％when X-ray range was 6-150 kV.Conclusion: The energy response characteristics of 4 kinds of new diagnosis X-ray dosimeter were better,and the response of different energy to dose conforms to the requirement of IEC in diagnosis dosimeters of semiconductor detector and air ionization chamber.%目的:对常用4种新型进口及国产医用诊断X射线剂量仪的能量响应特性进行比较研究.方法:在国际原子能机构(IAEA)北京二级标准剂量学实验室(SSDL)的标准辐射场中,采用替代法分别完成10种管电压为60～150 kV、管电流为10 mA、用2.5 mmAl(毫米铝)做附加过滤的X射线诊断辐射线质进行比对测量.结果:国产RD-98诊断剂量仪与进口剂量仪的能量响应性能,在60～150 kV的X射线范围内,不同能量对剂量的响应均在±5％以内.结论:4种新型诊断X射线剂量仪的能量响应特性均良好,半导体探测器的诊断剂量仪与空气电离室剂量仪,不同能量对剂量的响应均符合国际电工委员会(IEC)的要求.