X射线探伤临时作业与公众安全性

目的 估算阳江高本底辐射慢性照射可能导致的实体癌超额相对危险。方法 基于自然村室内、外环境剂量和性别年龄别居留因子，估算研究群组每一个成员的累积剂量。假定剂量与癌症危险间存在线性关系，利用1979－1995年的癌症死亡率资料，按照Poisson模型计算超额相对危险。结果 全部实体癌超额相对危险（ERR）为－0．11（95％CI，－0．67，0．69）／Sv。肝癌、鼻咽癌、肺癌和胃癌等前4位癌症的ERR（95％CI）／Sv分别为－0.99(-1.60,0.10),0.10(-1.21,3.28),-0.68(-1.58,1.66)和-0.27(-1.37,2.69)。结论 未发现实体癌超额相对危险与剂量有关。

Excess relative risk for solid cancer mortality during prolonged exposure to high-background natural radiation in Yangjiang area of China

Objective To estimate the excess relative risk for solid cancer associated with chronically exposure to high-background natural radiation in Yangjiang area of China. Methods Based on hamlet-specific environmental doses and sex-and age-specific occupancy factors,we calculated cumulative doses for each cohort member.Assuming a linear dose response relationship and using cancer mortality data for the period 1979-1995 and Poisson model,we estimated the excess relative risk(EER)for solid cancer. Results The ERR per Sv of all solid cancer is estimated to be -0.11(95% CI,-0.67,0.69 to 95%).The corresponding figures for cancers of liver,nasopharynx,lungs and stomach are -0.99(-1.60,0.10),0.10(-1.21,3.28),-0.68(-1.58,1.66) and -0.27(-1.37,2.69)respectively. Conclusion The association between ERR of solid cancer and dose can not be found.;