Radon concentration in groundwater was measured at 18 points including two continuous recording stations.
测量了包括两个连续记录台站在内共18个点的地下水的氡浓度。
Radon is a gaseous substance of radioactive. It exists widely in groundwater and atmosphere: or in pores of soil and rock.
前言：氡是气态的放射性物质，它广泛存在于岩石和土壤的孔隙中、地下水中和空气中。
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