摘要
对我国主要国营建材厂建材成品按10％随机抽样425个进行放射性检测,结果表明:建材产品中^(226)Ra、^(232)Th和^(40)K的比活度范围值及算术均值(括号内)分别为4～1339(74.8)、5～250(51.8)、27～1151(429.0)BqKg^(-1)。按《建筑材料用工业废渣放射性物质限制量标准》(GB6763—86)衡量,4.7％的建材产品不适于民用住宅建筑,其原因是由于添加了放射性水平较高的铀尾矿渣,赤泥及石煤等。
We collected randomly 425 samples from main buiding material factories in China,in the proportion of 10％.The content limits and averages of the building products ^(226)Ra、^(232)Th、^(40)K are 4～1339(74.8), 5～250(51.8),27～115l(429.0) BqKg^(-1).According to the 'Standard of Limit on radioactive substance for industrial waste slags used in building materials',4.7% of buidling materials are not suitable for civil building.The reason is that slags contained ^(223)U, red soil, bone coal so on are added, which radioactive level is high.
关键词
建筑材料
放射性
评价
Radioactive level
Assessment
Collect randomly samples
