Relationship among cancer,indoor radon and geology from Gejiu area

Ｒｅｌａｔｉｏｎｓｈｉｐａｍｏｎｇｃａｎｃｅｒ，ｉｎｄｏｏｒｒａｄｏｎａｎｄｇｅｏｌｏｇｙｆｒｏｍＧｅｊｉｕａｒｅａＬｕＷｅｉ（卢伟），ＡｎＳｈｕ－Ｑｉｎｇ（安树清）（ＴｉａｎｊｉｎＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙａｎｄＭｉｎｅｒａｌＲｅｓｏｕｒ...

NATURAL BACKGROUND RADIOACTIVITY LEVELS IN THE TERRESTRIAL ENVIRONMENT OF HONG KONG

This paper analyses and summarizes the natural radionuclide contents of soil and building materials, radon concentrations and the penetrating radiation levels in Hong Kong. From these, a thorough and objective assessment for the terrestrial background irradiation level of Hong Kong was made. Finally, the annual effective dose equivalent received by Hong Kong people due to the natural background irradiation was calculated to be 3.2 mSv.

个旧地区环境中氡水平及其与地质特点的关系

为了研究个旧地区环境中氡的浓度及分布、运移规律，采用ＳＳＮＴＤ方法，于１９９０－１９９２年间在个旧地区进行了氡的环境地质野外考察和土壤、居室内布点监测，共获４７９个数据。结果表明，尽管在个旧地区未发现铀、钍矿物，土壤氡水平普遍超过世界地壳土壤氡水平均值。居民室内氡水平均值高达４７１．９Ｂｑ·ｍ－３，远高于我国部分省、市近年来所测氡水平值，位于断裂带的居室氡水平高于远离断裂带的居室。个旧地区室内氡夏季高，冬季低，与一些国内、外有关报道结果相反。氡水平与楼层高度呈正相关，顶层为底层的２．７０倍。调查结果可能与个旧地区的环境地质因素有关。建议采取远离地质断裂带建房和防止上升气流逸入室内的防氡辐射进而防癌的措施。