摘要
天然石材用作饰面材料时，应按《天然石材放射防护分类控制标准》（ＪＣ５１８—９３）进行放射性评价。在石材矿山和石材产品放射性评价中，可采用核地球物理中地面γ能谱和γ总量（照射量率）检测方法，γ照射量率检出上限为５２ｎＣ／ｋｇ·ｈ。石材产品按内外照射限制值ＣＲａ和ＣｅＲａ的高低分为Ａ、Ｂ、Ｃ３大类。ＣｅＲａ超过１０００Ｂｑ／ｋｇ的石材不可用作饰面材料。
atural stone as building materials ought to be surveied and assessed according to the radiological protection standard for stone products. The methods of γ ray spectrum and gamma survey could be used in geological survey of stone bed or for stone products. The limit of γ ray radioactivity is 52nC/kg·h. The stone products are divided into three grades(A, B,C). The stone products with C e Ra ≥1000Bq/kg could not be used as in door decorator materials.
出处
《现代地质》
CAS
CSCD
北大核心
1998年第2期277-282,共6页
Geoscience
关键词
天然石材
放射性评价
放射性分类
控制值
natural stone, radioactivity estimation, grading values of radiological protection
