塔克什肯口岸土壤放射核素含量调查研究

Investigation of Natural Radionuclide Content in Soil of TakeShiken Port

利用高分辨半导体能谱分析方法分析了新疆塔克什肯口岸土壤天然放射性核素铀238、镭226、钍232、钾40和人工放射性核素铯137的含量,共选取8个采样点16个土壤样品及4个煤炭及废旧金属样点。结果表明:进口货物道路各采样点其铀238、钾40及铯137均比非进口货物道路各点高,镭226、钍232含量则相反,而煤炭和废金属的各样品的铀238、镭226、钍232、钾40都高于进出口道路和非进口道路,Cs137则相反,表明进口煤炭和非金属对天然放射性核素产生了较大影响,而对人工放射性核素影响较小。和新疆及全国背景值比,进口道路和非进口道路土壤中各放射性核素含量均未超过天然本底值范围,进口煤炭和废金属虽然各放射性核素含量则略高于背景值,表明试验点没有受到放射性污染,对当地居民和进出境人员不会产生辐射伤害。

16 samples from 8 sampling points and 4 coal combined with waste metals points were selected to study the contents of natural radionuclides ^226U, ^226Ra, ^232Th, ^40K and artificial radionuclide ^236Cs in the soil of TakeShiken Port , Xinjiang province, by high resolution semiconductor gamma spectroanalysis. The results showed that： the contents of ^238U, ^40K and ^137Cs in import roads were higher than those of non-import roads, while ^226Ra and ^232Th showed opposite trend. Samples of coal combined with waste metals had the higher contents of ^238U, ^2366Ra, ^232Th and ^40K than those of import-export roads and non-import roads, while contents of ^137Cs got less, indicating that importing coal and waste metals had great influence on natural radionuclide. Compared with the background of Xinjiang province arid national values of natural radionuclide, contents of radionuclide in import roads and non- import roads were in the range of natural background values, importing coal and waste metals made the contents of radionuclide a bit higher than background. It indicated that the radioactive contamination didn＇t influence the port, the local residents and persons leaving or entering the country, would not be harmed from radiation.