In the "Classification Control Standard for Radiation Protection of Natural Stone Products" promulgated by the state, according to the radium equivalent concentration of stone, the radioactivity of stone is divided into three categories: A, B and C. Class A is used for interior decoration and Class B is used for other decorations. The interior decoration, Class C can only be used for the exterior finish of all buildings. According to the latest inspection results of relevant departments, the radioactivity level of marble is relatively low, and the radioactivity of granite is relatively high. The emission level of most of China's stone meets the requirements of the standard and is suitable for room decoration.
There are many ways to detect the radioactivity of stone. The more common and simple method is to use the Geiger counter. In addition, chemical analysis can be used in combination with physical methods. Experts remind consumers to ask for the product radioactive certificate at the time of purchase. For consumers who have used stone, they can contact Peking University Environmental Science and Technology Testing Center and Beijing Radiation Health Protection Department to ask experts to do standard testing of stone radioactivity. .
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