Some families will use the natural stone materia as decorative material in TV-wall, balcony, toilet countertop, in order to chase the high level interior decoration to add the effect strongly. The natural stone material has certain radioactive substances, but according to the national standards, the radioactive substances is harmless for people. According to " The Controled Radioactive Classification Of Natural Stone Material " requirements, only the natural stone material in level A standard can be used indoor. Everyone must be carefull when choosing the natural stone material. Generally speaking, the mian natural composition of stone is radioactive radium, and the red, deep red stone has much radium. If a simple family decoration only has a little radioactive radium is not harmful for our health.