Measurements of thoron and radon progeny concentrations in Beijing, China
Measurements of thoron and radon progeny concentrations in Beijing, China
复制标题
中国北京钍气和氡气子体浓度的测量
DOI：
10.1088/0952-4746/28/4/n02
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发表时间：
2008-12-01
影响因子：
1.5
通讯作者：
Guo, Qiuju
中科院分区：
文献类型：
--
作者：
Zhang, Lei;Liu, Cuihong;Guo, Qiuju
据报道，中国的钍气水平高于世界平均水平，因此可能对自然本底辐射剂量产生重大影响。因此，我们于 2006 年春季在中国北京地区对钍气和氡气子体的浓度进行了试点研究。调查期间使用了带有CR-39探测器的新型便携式24小时积分监测仪。调查期间测量了 70 处住宅和 8 个室外地点。对于由红砖和泥浆建造的乡村房屋，钍气和氡气的平均平衡当量浓度（EEC）分别为1.02±0.48和16.41±9.02 Bq m−3，而对于由水泥块和楼板建造的城市住宅，钍气和氡气的平均平衡当量浓度（EEC）分别为0.48±0.47和11.50±6.99 Bq m−3，分别。对于室外空气，钍气和氡子体的浓度分别为 0.29 ± 0.28 和 7.05 ± 2.68 Bq m−3。还评估了钍气和氡子体的辐射暴露；在乡村住宅和城市住宅中，钍气子体与氡气子体的剂量贡献比估计分别为28%和17%。
It has been reported that thoron levels in China are above the world average and may therefore make a significant contribution to the natural background radiation dose. We therefore conducted a pilot study of concentrations of both thoron and radon progeny during the spring of 2006 in the Beijing area, China. A new type of portable 24 h integrating monitor with a CR-39 detector was used during the survey. Seventy dwellings and eight outdoor sites were measured during the survey. For country houses built of red bricks and slurry, the average equilibrium equivalent concentrations (EEC) of thoron and radon were 1.02 ± 0.48 and 16.41 ± 9.02 Bq m−3, respectively, whereas for city dwellings built of cement blocks and floor slabs, the results were 0.48 ± 0.47 and 11.50 ± 6.99 Bq m−3 for thoron and radon, respectively. For outdoor air, concentrations of thoron and radon progeny were 0.29 ± 0.28 and 7.05 ± 2.68 Bq m−3, respectively. Radiation exposures from thoron and radon progeny were also evaluated; the ratio of dose contribution from thoron progeny to that of radon progeny was evaluated to be 28% and 17% in country houses and city dwellings, respectively.