摘要
根据“核能源与其他能源对健康、环境和气候改变影响的比较研究”课题组的要求,对浙江省部分石煤矿的放射性水平进行了调查。第一阶段从2002年12月至2004年7月,对浙江安仁锦江煤矿按季节进行的4次测量结果表明,石煤中的238U2、26Ra2、32Th4、0K平均含量分别为786、734、16和620 Bq/kg。井下全年平均222Rn浓度为141 Bq/m3;在自然通风状况下呈现出夏季最高,冬春最低的变化规律;γ辐射剂量率平均值为549 nGy/h,且变化不大。第二阶段为2005年7月对浙江锦江煤矿、新兴煤矿和红星煤矿的调查,发现井下222Rn浓度是矿工个人年有效剂量的主要来源;在自然通风良好的煤矿中,矿工年有效剂量在2 mSv/a以下;在机械通风不足的煤矿中,矿工年有效剂量达到28 mSv/a以上,超过了辐射防护标准规定的职业照射剂量限值要求,必须改善通风条件,切实保障矿工的健康。
According to the research program on comparison the effect of nuclear energy and other energies on health, environment and climate change, radioactivity level and radiation dose to the miner in Zhejiang Bone Coal Mine was investigated. The first stage, started from December 2002 to July 2004, conducted 4 times measurement. The results show that ^238U,^226Ra,^232Th,^40K contents in bone coal are 786 Bq/kg, 734 Bq/kg, 16 Bq/kg and 620 Bq/kg respectively. The annual average of ^222Rn content is 141 Bq/m^3 in the mine, with the highest value in summer and the lowest in winter-spring under the natural ventilation. The annual average γ dose rate is 549 nGy/h. The second stage investigation in July 2005 was carried out for three mines. It is found that the ^222Rn content in mine is the major contributor to the annual effective dose to miners. The dose to the miner can be maintained below 2 mSv/a under well controlled ventilation, while the dose may exceed 28 mSv/a if the ventilation dose not work well. It is necessary to improve ventilation in order to safeguard miner＇s health.
出处
《辐射防护》
CAS
CSCD
北大核心
2007年第3期163-170,187,共9页
Radiation Protection
基金
国防科工委“核能源与其他能源对健康、环境和气候影响比较研究”课题的子课题.
