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一、氧和氧子体剂量学历史吸入氡和氡子体所致肺组织剂量的计算,从1940年Evans等人公布第一个氡致肺组织剂量计算开始,至今已有40余年的历史,其剂量学发展大致可分为三个阶段;第一阶段1940～1951年,认为该阶段氡致肺组织剂量的计算主要来自于肺内氡的衰变,并假定氡衰变的子体全部沉着在肺内。一个氡原子衰变释放的α能量初期取6.95MeV,后期取19.2MeV,这个能量被35～50微米厚(组织重量取9.4～14
First, the oxygen and oxygen dose history of inhalation Radon and radon progeny lung dose calculation, from the 1940 Evans et al. Announced the first dose of radon caused lung dose calculation, has been more than 40 years of history, The dosimetry development can be roughly divided into three stages; the first phase from 1940 to 1951, that the calculation of the dose of radon caused lung tissue during this stage mainly from the decay of radon in the lung, and assume that radon decay progeny all calm in the lung Inside. The alpha energy released by a radon atomic decay is 6.95 MeV in the initial stage and 19.2 MeV in the latter stage. The energy is 35-50 micrometers thick (the tissue weight is 9.4-14