广东阳江高本底地区γ辐射水平调查

A survey of terrestrial γ radiation level in high background radiation area of Yangjiang,Guangdong

目的调查阳江高本底地区和对照地区地表γ辐射水平。方法采用多阶段抽样的方法,选择阳江高本底地区112所房屋,恩平对照地区147所房屋,使用便携式X、γ剂量率仪(FH40G+FHZ672E-10)测量屋内和门口的γ辐射水平,同时测量选定管区的室外γ辐射水平。结果高本底地区室内外γ辐射水平分别为(0. 36±0. 06)μSv/h和(0. 16±0. 06)μSv/h,对照地区分别为(0. 13±0. 05)μSv/h和(0. 09±0. 03)μSv/h,高本底地区室内外γ辐射水平约为对照地区的3倍和2倍,差异均具有统计学意义。高本底地区新房屋室内γ辐射水平为(0. 34±0. 05)μSv/h,低于老房屋室内γ辐射水平(0. 38±0. 05)μSv/h;对照地区的新房屋室内γ辐射水平为(0. 18±0. 02)μSv/h,高于老房屋室内γ辐射水平(0. 09±0. 03)μSv/h,两者的差异均有统计学意义。结论阳江高本底地区γ辐射水平显著高于对照地区,但两地区差异较上世纪有所减小。

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( FH40 G +FHZ672 E-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.