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据测定，目前四川省燃煤电厂煤灰渣中的天然放射性核素２３８Ｕ、２３２Ｔｈ、２２６Ｒａ、４０Ｋ等的水平较原煤高出一倍以上；大部分燃煤电厂排放灰渣中的放射性水平超过了我国《建筑材料放射卫生防护标准》（ＧＢ６５６６－８６）所规定的限值［１］，限制了煤灰渣在建筑上?
It has been determined that at present the natural radionuclides 238U, 232Th, 226Ra, 40K and so on in the coal ash residue of the coal-fired power plants in Sichuan Province are more than twice as high as the raw coal; and the radioactivity levels of most coal-fired power plants discharging ash exceed China’s “building materials Radiation Health Protection Standards” (GB6566-86) provided for the limit [1], limiting the ash in the construction?