【摘要】 环境辐射监测仪表作为微弱放射性监测计量器具,它的量值溯源是一个急需解决的问题。由于环境辐射剂量率低且电离信号微弱,故通常采用大体积电离室或者充压电离室进行测量。依托60～250 k V X射线空气比释动能基准电离室,在完成重过滤窄谱X射线辐射质空气比释动能绝对测量的基础上,通过逐级替代法完成大体积环境辐射监测仪器的校准。测量结果不确定度为5.6%(k=2),实现环境水平X射线空气比释动能测量量值溯源,为国内环境辐射监测仪器在低剂量率水平的性能评价提供计量保障。更多还原

【Abstract】 As a measuring instrument for weak radioactivity monitoring, the traceability of the environmental monitoring is an urgent problem to be solved. Because the environmental radiation dose rate is low and the ionization signal is weak,it is usually measured by large volume ionization chamber or charging pressure ionization chamber. On the based of primary standards of 60 ～ 250 k V X-ray air kerma and absolute measurement of the air kerma under the narrow spectrum series X-ray radiation quality,radiation environmental monitoring instruments were calibratied by successive substitution method. The uncertainty of measurement measurement result is better than 5. 6%( k = 2). It realize the traceability of environmental level X-ray air kerma measurement,and provide metrological support for the performance evaluation of environmental radiation monitoring instruments at low dose rate level.更多还原