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The Mechanism Study of Radioactive Microparticles in the Body by Respiration and the Risk Assessment of Internal Exposure by using an Improved Model

放射性微粒呼吸进入体内的机制研究及改进模型内照射风险评估

基本信息

批准号：
19J14291
负责人：
HU JUN
金额：
$ 1.09万
依托单位：
Hirosaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2019
资助国家：
日本
起止时间：
2019-04-25 至 2021-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19J14291/
关键词：
222Rn and 220Rn EERC and EETC radioactive particles radon internal exposure

项目摘要

Based on the results of the last year’s exposure experiment, a comparison of the testing of the deposition velocities of 222Rn and 220Rn progenies with previous studies was carried out. The results indicated that the results were acceptable in this research. An improved passive CR-39 based direct 222Rn/ 220Rn progeny monitor was also calibrated in this exposure system, which are suitable to assess the 222Rn and 220Rn exposure in dwellings. Based on development of the improved 222Rn/ 220Rn progeny monitor, a survey was carried out in Beijing, Changchun, China and Aomori, Japan in 2018. The inhalation exposure was estimated by using the calibrated progeny monitor, and then used to analyze the relevance of the outdoor PM2.5 to the behavior of indoor 222Rn and 220Rn. The result indicated which indicates that the indoor PM2.5 concentration performs positively correlated with EERC and EETC, and EETC is more correlated compared to EERC. It can be explained as the ambient particles whose sizes are larger than the indoor aerosol source, can enter indoor by natural ventilation and infiltration. The 220Rn progeny has a relatively longer half-life than the 222Rn and its progeny. Therefore, 220Rn progeny is more affected by the deposition and attachment process of aerosol, which performed stronger relevance to PM2.5 concentration. In the future, more continuous measurements on environmental factors include both indoor and outdoor PM2.5 exposure and particle size need to be considered to analyze the connection between 222Rn, 220Rn and PM2.5 exposures.

根据去年的暴露实验结果，对222 Rn和220 Rn子体的沉积速度的测试结果与以往的研究结果进行了比较。结果表明，本研究的结果是可以接受的。本系统还标定了一种改进的基于CR-39的被动式直接222 Rn/220 Rn子体监测仪，适用于住宅内222 Rn和220 Rn的暴露评估。基于改进的222 Rn/220 Rn子代监测仪的开发，2018年在中国北京、长春和日本青森进行了调查。利用校准后的子体监测仪估算吸入暴露量，并分析室外PM2. 5与室内222 Rn和220 Rn行为的相关性。结果表明，室内PM2.5浓度与EERC和EETC呈正相关，且EETC的相关性比EERC更强。这可以解释为粒径大于室内气溶胶源的环境颗粒物通过自然通风和渗透进入室内。220 Rn子体的半衰期比222 Rn及其子体相对更长。因此，220 Rn子体受气溶胶沉积和附着过程的影响更大，与PM2.5浓度表现出更强的相关性。在未来，对环境因素的更连续的测量包括室内和室外PM2.5暴露和颗粒大小需要考虑分析222 Rn，220 Rn和PM2.5暴露之间的联系。