CAJ | 학술논문

目的调查山东省典型非铀矿山井下22Rn浓度并估算矿工接受年有效剂量.方法利用固体径迹探测器CR-39累积测量金矿、铁矿、煤矿井下220Rn、222Rn浓度,利用高纯锗γ谱仪分析矿石226Ra、232Th、40K活度浓度.结果山东非铀矿山井下220Rn浓度平均值由高到低依次为金矿、铁矿、煤矿、黏土矿,分别为1200、280、120和40 Bq/m3;煤矿、金矿、黏土矿和铁矿的226Ra、232Th、40K活度浓度基本处于我国土壤天然放射性核素浓度范围内;222Rn及其子体所致井下矿工年有效剂量,金矿最高为7.7 mSv,铁矿次之,为1.7 mSv,煤矿和黏土矿均低于1mSv.结论金矿和铁矿应采取加大通风能力等措施降低井下氡浓度,井下矿工应该作为职业照射人员进行管理.
목적 조사산동성전형비유광산정하22Rn농도병고산광공접수년유효제량.방법 이용고체경적탐측기CR-39루적측량금광、철광、매광정하220Rn、222Rn농도,이용고순타γ보의분석광석226Ra、232Th、40K활도농도.결과 산동비유광산정하220Rn농도평균치유고도저의차위금광、철광、매광、점토광,분별위1200、280、120화40 Bq/m3;매광、금광、점토광화철광적226Ra、232Th、40K활도농도기본처우아국토양천연방사성핵소농도범위내;222Rn급기자체소치정하광공년유효제량,금광최고위7.7 mSv,철광차지,위1.7 mSv,매광화점토광균저우1mSv.결론 금광화철광응채취가대통풍능력등조시강저정하동농도,정하광공응해작위직업조사인원진행관리.
Objective To measure 222Rn and 220Rn concentrations in the underground non-uranium mines in Shandong Province,and to estimate the annual effective dose to the miners.Methods Concentrations of 222Rn and 220Rn in selected gold,iron,coal and clay mines were determined by passive time-integrating detectors with CR-39.Activity concentrations of 226Ra,232Th and 40K were determined using gamma spectrometry equipped with HPGe detector.Results The average concentrations of 220Rn in the gold,iron,coal and clay mines were estimated to be 1200,280,120 and 40 Bq/m3,respectively.The activity concentrations of 226Ra,232Th,40K in the ores for gold,iron,coal and clay mines ranged the same as the soil in China.The annual effective dose due to radon exposure in gold and iron mine was 7.70 mSv and 1.74 mSv,respectively.The annual doses received by miners in the coal and clay mines were lower than 1 mSv.Conclusions Underground miners in some gold and iron mines should be treated as workers occupationally exposed to ionizing radiation.The measurement such as increasing ventilation should be implemented to reduce underground radon concentration in these mines.