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| A survey of terrestrial γ radiation level in high background radiation area of Yangjiang, Guangdong |
| LI Xiaoliang1, ZHAO Xipeng1, ZHAO Yuqian1, ZHU Weiguo1, HUANG Zhibiao2, CHEN Chisong3, LEI Shujie1, SUN Quanfu1 |
1. Key laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088 China;
2. Yangjiang Center for Disease Control and Prevention;
3. Enping Center for Disease Control and Prevention |
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Abstract Objective To obtain the levels of terrestrial γ radiation in the high background radiation area (HBRA) of Yangjiang and its control area of Enping.Methods A total of 112 houses in the HBAR and 147 houses in Enping were selected through multi-stage sampling. The in-room and at-gate γ radiation level swere measured by a survey meter(FH40G+FHZ672E-10). Meanwhile, the levels of outdoor γ radiation of selected villages were also measured.Results The indoor and outdoor γ radiation levels in the HBRA were (0.36±0.06) μSv/h and (0.16±0.06) μSv/h, while the levels in Enping were (0.13±0.05) μSv/h and (0.09±0.03) μSv/h, respectively. The levels of indoor and outdoor γ radiation in the HBRA are about 3 and 2 times of those in Enping, respectively, and the differences were statistically significant. The levels of indoor γ radiation in the HBRA were (0.34±0.05) μSv/h and (0.38±0.05) μSv/h for the new houses and the old houses, respectively. While the values in the control area were (0.18±0.02) μSv/h and (0.09±0.03) μSv/h, respectively. The differences between the new and old houses were both significant in the two areas.Conclusion The level of γ radiation in the HBRA of Yangjiang is much higher than that of control area, but the difference between the two areas is decreasing.
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Received: 18 June 2018
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