We make measurements of radioactive gas Rn and Th on 12 measuring lines by using gaseous chemical method in Wudalianchi region.

• 用气体化学方法,在五大连池药泉山、卧虎山、笔架山、老黑山、东、西龙门山之间进行了氡、钍放射性气体测量,布设了12条测线。