中文摘要：

氡子体未结合态份额直接影响环境中氡暴露剂量。为了弄清楚现场环境氡子体未结合态份额,准确评价氡暴露剂量,利用累积式氡子体未结合态份额测量装置对环境中氡子体未结合态份额进行了现场测量,对不同环境氡暴露剂量和未结合态氡子体的影响进行了评价。研究表明,尽管不同环境氡子体浓度有较大差别,室内外氡子体未结合态份额差别不是太明显,室内外环境氡子体未结合态份额变化范围9.27%～16.87%,未结合态氡子体对氡子体暴露有效剂量贡献的份额在30.22%～46.24%变化,矿山环境氡子体未结合态份额和剂量贡献份额明显高于室内环境。

英文摘要：

The unattached fraction of indoor radon progeny is one of the most important factors working on radon exposure evaluation.For a precise evaluation and analysis on radon exposure,detail information on radon progeny,especially its unattached fraction in real indoor environments is necessary to understand.In this paper,a new type of portable,low cost,reusable integrating monitor with etched track detector（CR-39） for field measurement on unattached fraction of radon progeny was deployed for a pilot survey on unattached fraction,and evaluation on radon exposure in different indoor environments was carried out.It was indicated by the results that the dose contribution of unattached fraction to that of total radon progeny is obvious,around 36%—62%.No big difference of dose contribution of unattached fraction was found in different indoor environments,and the biggest contribution of unattached fraction was found in coal mine.