128 samples of granites of decorative building materials from 5 cities in Guangxi were gathered, and the parameters such as specific activity, internal exposure index and external exposure index of 226Ra, 232Th, 40K were measured by gamma spectrometer. According to measured results, level A was 115 samples accounting for 89. 8% , level B was 11 samples accounting for 8.6% , level C were 2 samples accounting for 1.6%. The analysis result showed that mostly granites were safe which can be directly used for interior decoration, but about 10% granites were unsafe.%对广西5个城市建筑装修材料市场的各种花岗岩石材进行抽样,共抽取了128个花岗岩石材样品,用低本底多道γ能谱仪测定其放射性核素226 Ra,232 Th,40 K的放射性比活度、内照射指数和外照射指数,并据此进行分类,其中A类装饰装修材料样品为115个,占89.8%;B类装饰装修材料样品为11个,占8.6%;C类装饰装修材料样品为2个,占1.6%.调查结果表明,绝大部分花岗岩石材是安全的,可直接用于居家室内装修,但也有约10%的花岗岩石材不能用于居家室内装修.
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