进口花岗岩石材中天然放射性水平检测分析

Analysis on Natural Radioactivity Levels in Import Granite Building Materials

[目的 ]分析进口花岗岩石材等建筑材料中天然放射性核素的比活度 ,探讨辐射水平与人体受照有效剂量关系 ,为合理使用建筑材料提供依据。[方法 ]用γ谱仪测量样品中2 2 6Ra、2 3 2 Th和40 K的放射性比活度 ,并计算出样品的Ra当量浓度 (ECRa)及外照射年有效剂量HE。[结果 ]不同产地、品种的进口花岗岩石材样品中 ,天然放射性核素的比活度与普通建筑材料比有较大差别。而进口花岗岩石材 3 5个样品的ECRa和HE均值 ,与国产花岗岩及其它建筑材料相比 ,除与福建产花岗岩的HE值比差异有显著性 (P <0 0 5 )外 ,其余差异均有高度显著性 (P <0 0 1)。 [结论 ]进口花岗岩石材样品中天然放射性核素的比活度 ,高于国产同类产品及其它普通建筑材料 (除矿渣CRa外 ) ;应加大建筑材料放射性知识宣传和建材产品监测监督力度 ,保障广大群众的身体健康。

Objective \] To analyze the specific activities of natural radionuclides in import granites and other building materials and explore the relationship between radioactivity levels and its effective dose to human body, the building materials can be reasonably selected by the people \[ Methods \] The specific activities of 226 Ra, 232 Th and 40 K were measured by γ ray spectrometer and EC Ra and H E were calculated \[ Results \] The activities of natural radionuclides in import granites from different area and kinds were significantly different from general building materials EC Ra and H E in 35 import samples were significantly different (P<0 01) from other homemade granites except H E in Fujian granites (P<0 05) \[ Conclusion \] The specific activities of natural radionuclides in import granite are higher than those in homemade products and other general building materials except C Ra of scoriae It's necessary to strengthen the education of radiation knowledge in building materials and monitor the products for people's health protection