Crawford-Brown D J
Health Phys. 1987 Feb;52(2):149-56. doi: 10.1097/00004032-198702000-00003.
The U.S. Environmental Protection Agency currently is considering regulatory standards limiting the concentration of 222Rn in public drinking water supplies. As part of this effort, a criteria document has been prepared detailing the health risks expected to occur from the presence of 222Rn in water used in homes. The present report examines the dose equivalent delivered to lung tissue following direct ingestion of 222Rn in water. Irradiation from both in-situ decay of 222Rn in lung tissue and the decay of 222Rn in lung air passages following exhalation are examined and results presented for ages from neonate through adult. These results indicate that the risk of lung cancer from inhalation of airborne progeny following emanation of 222Rn from water into home air is significantly greater than the risk from both irradiation pathways considered in ingestion at all ages.
美国环境保护局目前正在考虑制定监管标准，以限制公共饮用水供应中222Rn的浓度。作为这项工作的一部分，已编制了一份标准文件，详细说明了家庭用水中存在222Rn可能产生的健康风险。本报告研究了直接摄入水中222Rn后肺部组织所接受的剂量当量。研究了肺部组织中222Rn原位衰变以及呼出后肺部气道中222Rn衰变产生的辐射，并给出了从新生儿到成年人各年龄段的结果。这些结果表明，222Rn从水中散发到室内空气中后，吸入空气中的子体导致肺癌的风险在所有年龄段都显著高于摄入时所考虑的两种辐射途径带来的风险。
