In the decoration of various buildings, stone is one of the main choices of materials, but the radioactive elements contained in the stone are people's concerns. In nature we can say that any substance contains radioactive elements. Let's take a look at the National Standard for Radioactive Stones. Stone radioactive national standards In order to protect the physical and mental health of consumers, as early as in 1994, the National Building Materials Industry Bureau promulgated JC518-1993 "Standard for Control of Radioactive Protection Classification of Natural Stone Products". In 2001, the General Administration of Quality Supervision, Inspection and Quarantine formulated the "Radioactive Nuclide Limits for Building Materials". †According to the radioactive level of the decoration materials, the decoration materials are divided into A, B, and C categories. 1. Class A decoration materials. The scope of use of such products is not limited. 2. Class B decoration materials. This kind of stone products can not be used for the interior surface of Class I civil buildings, but can be used for the exterior surfaces of Class I civil buildings and the interior and exterior finishes of all other buildings. 3, Class C decoration materials. This type of product can only be used for exterior decoration of all buildings and other outdoor use. Home decoration must not only create a home for the United States and the United States, but also pay attention to safety, poor quality marble radiation is relatively large, the harm to the human body is also large, so we still have to keep in mind the national standards of radioactive stone, choose the marble of the standard to decorate their home . Method for detecting stone radioactive The more common and convenient method is to use a Geiger counter, and it can also be calculated using chemical analysis combined with physical methods. Experts remind consumers that they must ask the manufacturer for a radioactive certificate at the time of purchase. For consumers who have already used stone, they can contact the Peking University Environmental Technology Testing Center and the Beijing Radiation Protection Department. . Home decoration has a lot of emissive stone 1. Marble As a part of home improvement, marble is an irreplaceable effect. Marble in home improvement stone is the first choice for many home improvement building materials. Marble has good rigidity, high hardness, strong abrasion resistance, small temperature deformation, and marble is widely used in laying kitchens, bathrooms, living rooms and other floors and countertops. It is widely used in homes. However, marble contains trace amounts of helium, which is a radioactive inert gas and has strong radioactivity. It emits x and gamma rays. When the human body inhales, it is affected by internal radiation exposure. 2, tiles Tiles are one of the other building materials used in the renovation. Some tiles contain radioactive elements that are harmful to human health. Therefore, when choosing tiles, pay attention to them. According to the experts’ proposal, besides buying tiles, consider prices, Apart from quality and color, don’t forget to check its radioactivity test report. The ultra-white bricks in the polished tiles are the most radiant in all tiles; the precipitating rate of radioactive elements on the surface of the glazed tiles is higher than that of ordinary tiles. The effects of x and γ rays on humans are mainly caused by DNA fragmentation. How to choose stone, reduce indoor radiation hazards? When buying marble, be careful to use red and brown series of granite, marble, if you use, the best area of ​​the shop does not exceed 40 square meters; try not to buy "mobile stalls" of marble, because a lot of marble are It is stained, and there is a problem with the safety of the paint; when it is selected on the spot, there are three methods: eye view, ear hearing, and ink drip. 1, eye view The fine stone material with a uniform fine structure has a delicate texture, and is a stone product; coarse and unequal grained stones have poor appearance. Under normal circumstances, the radioactivity of stone can be seen from the color. The radioactivity from high to low is red, green, meat red, gray white, white and black. 2, ear listening The sound of good quality stone knocking is crisp and sweet; if the interior of the stone is slightly cracked or weathered causes loose contact between particles, the knocking sound is coarse and dumb. 3, drop ink A small amount of ink is dropped on the back of the stone. If the ink quickly spreads out and leaches out, it indicates that the internal particles of the stone are loose or have gaps. The quality of the stone is not good; if the ink drops are not moving in place, it means that the stone material is good. Summary: The above is the content of the national standards for radioactive materials in stone that Xiaobian introduced to everyone. I hope that we can effectively help everyone. For more information, please pay attention to this site. 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