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长白山火山熔岩覆盖地区环境γ辐射外照射水平杨文土皆张守志张冠英（吉林省卫生防疫站，长春１３００２１）１一般概况长白山火山熔岩覆盖地区位于吉林省东南部，有１４４座火山口，地处东经１２６°７′４″～１２８°１６′３５″，北纬４１°３３′２５′～４２°４...
Environmental radiation level of γ radiation in the area covered by volcanic lava in Changbai Mountain YANG Wen-tao, ZHANG Shou-zhi, ZHANG Guan-ying (Jilin Provincial Health and Epidemic Prevention Station, Changchun 130021) 1 General situation The Changbaishan volcanic lava area is located in the southeastern Jilin Province with 144 caldera ° 7’4 “~ 128 ° 16’35” north latitude 41 ° 33’25 ’~ 42 ° 4 ...