Decorated with natural stone floor room, walls, is there any pollution?

In recent years, as people gradually understand the natural stone, natural stone decorated with the ground, the walls of the family is increasing. According to the January 2002 implementation of the "building materials radionuclide limit" Gb6556-2001 standard requirements: marble, slate, sandstone stone, can decorate the home. The granite is divided into ABC three categories: A class, in more than 600 granite varieties, more than 95% pollution-free, can be used for home decoration; B, can not be used for residential, apartments, nurseries, schools, hospitals and other interior decoration ; Class C, can only be used outside the building exterior and outdoor locations. In the selection of granite to be careful, careful selection of red, green or with a large red spots and varieties of black slate.

Natural stone radioactive pollution, mainly refers to the natural radioactive elements in the nuclear decay process of radon. Radon is absorbed by the body, will cause harm to the lungs. But the radon half-life of only 3.2 days, if you have decorated with B or C family of stone, as long as the indoor air circulation, radon content will be reduced, such as ventilation for more than half an hour its content is almost equal to zero. In this particular reminder: In the purchase of stone, be sure to ask the seller to green proof.