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根据放射性物质的活度和特性,把它们主要划分为强放射性和低放射性两类污染物。划分的标准是每立方英尺1居里放射性强度,低于此标准的所有物质划为低放射性废物。开采和水冶排放的废水及废气属于第二类。
According to the activity and characteristics of radioactive material, they are mainly divided into two kinds of pollutants: strong radioactive and low radioactive. The division criteria is 1 Curie radioactivity per cubic foot. All substances below this standard are classified as low-level radioactive waste. Wastewater and gas emissions from mining and hydropower plants fall into the second category.