List of Radioactive Strength of Common Stone Materials
In 2000, the country issued the "Standards for Radiological Health Protection of Building Materials", which redefined the building materials into three categories: the production, marketing and use of Class A products are not restricted; Class B products cannot be used for buildings (such as residential buildings, factory buildings, public living rooms, etc.), but can be used for structures (such as fences, gatehouses, pavilions, pavilions, verandas, memorial archways, patios, water towers, chimneys, poles, dams, roads, warehouses, etc.); The sales of Class C products must be restricted and can only be used for subgrade, culvert, dam, seawall, buried pipeline works and other structures outside residential areas. That is to say, Class B and C stone products are not used for interior decoration of homes and offices.