吉林省某矿区放射性监测及评价

Monitoring and evaluation of Radiation in a Mining Area of Jilin Province

目的了解吉林省某矿区环境放射性水平,并做出环境辐射评价。方法采样及测量方法均按照国家规定的方法对矿区周围环境进行放射性监测。结果矿井内氡浓度为4140～8290Bq/m3,最高浓度是标准限值的21倍;环境γ剂量率在规定限值内;天然放射性核素只有238U超出本底30.84Bq/kg,其余均在吉林省本底范围内。结论矿井下氡浓度超过标准限值,说明井下通风系统在现有情况下不能满足降低氡及其子体的要求;γ和天然放射性核素对人员和环境的影响可忽略。

[ Objective] To understand the radioactive levels of environment of a mining area, and make evaluation of environmental radiation. [ Methods] Sampling and measurement methods were in accordance with the provisions of the national approach. [ Results] Radon concentration in mine was 4140 - 8290 Bq / m^3. The high level was 21 times of Standard limit; environmental γ dose rate was within the standard limit; natural radioactive nuclide ＂238U＂was beyond the environment normal for 30.84 Bq/kg, the rest were in the limit range of Jilin Province. [ Conclusion]The radon concentration of the mine is over the standard limit which shows that the present mine ventilation system can not meet the requirements of low Raton. The impacts of γ and natural radioactive nuclide on personnel and environment can be neglected.