Radon (²²²Rn) concentration in indoor air near the coal mining area of Nui Beo, North of Vietnam

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• 作者：Dang Duc Nhan^a ; ^{dangducnhan50@gmail.com} ; Carvalho P. Fernando^b ; Nguyen Thi Thu Ha^c ; Nguyen Quang Long^c ; Dao Dinh Thuan^d ; Heloisa Fonseca^b
• 关键词：Radon ; Indoor 222Rn concentration ; Mining area ; Radon Action Level
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：August, 2012
• 卷：110
• 期：Complete
• 页码：98-103
• 文件大小：685 K

摘要

Concentrations of radioactive radon gas (²²²Rn) were measured using passive monitors based on LR115 solid state track detectors during June-July 2010 in indoor air of dwellings in the Nui Beo coal mining area, mostly in Cam Pha and Ha Long coastal towns, Quang Ninh province, in the North of Vietnam. Global results of ²²²Rn concentrations indoors varied from 鈮? to 145聽Bq聽m^鈭? averaging 46聽卤聽26聽Bq聽m^鈭? (n聽=聽37), with a median value of 47聽Bq聽m^鈭?. This was similar to outdoor ²²²Rn concentrations in the region, averaging 43聽卤聽19聽Bq聽m^鈭? (n聽=聽10), with a median value of 44聽Bq聽m^鈭?. Indoor ²²²Rn concentrations in the coastal town dwellings only were in average lower although not significantly different from indoor ²²²Rn concentrations measured at the coal storage field near the harbor, 67聽卤聽4聽Bq聽m^鈭? (n聽=聽3). Furthermore, there was no significant difference in the average ²²²Rn concentration in indoor air measured in the coastal towns region and those at the touristic Tuan Chau Island located about 45聽km south of the coal mine, in the Ha Long Bay. The indoor ²²²Rn concentration in a floating house at the Bai Tu Long Bay, and assumed as the best estimate of the baseline ²²²Rn in surface air, was 27聽卤聽3聽Bq聽m^鈭? (n聽=聽3). Indoor average concentration of ²²²Rn in dwellings at the Ha Noi city, inland and outside the coal mining area, was determined at 30聽Bq聽m^鈭?. These results suggest that ²²²Rn exhalation from the ground at the Nui Beo coal mining area may have contributed to generally increase ²²²Rn concentration in the surface air of that region up to 1.7 times above the baseline value measured at the Bai Tu Long Bay and Ha Noi. The average indoor concentration of ²²²Rn in Cam Pha-Ha Long area is about one-third of the value of the so-called Action Level set up by the US EPA of 148聽Bq聽m^鈭?. Results suggest that there is no significant public health risk from ²²²Rn exposure in the study region.