【摘要】 <正> 介绍了该实验室建立的低能X射线(10～100kV)自由空气电离室。该电离室设计了三个不同宽度的收集极用于不同kV值的X射线测量。电离室测量照射量的总不确定度对25～100kV估计为0.39％(K=1),对10kV估计为0.45％(K=1)。该自由空气电离室与英国NE公司生产的治疗级次级标准剂量计NPL-2560比对,其结果与英国国家物理实验室更多还原

【Abstract】 The Free-Air Chamber for low energy X-rays and its correction factors and results are introduced. The total uncertainty of the exposure measurement of this chamber is estimated being 0. 39% (K=1) for 25-100 kV,and 0. 45% for 10 kV X-rays, respectively. Calibration of the secondary standard dosimeter NPL-2560 produced by NE company,U. K. with this chamber shows a systematic difference lower than the results given by NPL in March, 1983, but little higher than that given by the China National Institute Metrology. However,they are still agreed within 1%.更多还原