Indoor environmental experts have shown that there are two main hazards in natural stone, namely, in vivo and in vitro radiation. Radiation in the body is mainly derived from the decay of radioactive radiation in the air. Into the human respiratory system caused by radiation damage, induced lung cancer. In addition, radon also has a high affinity for body fat, thus affecting the nervous system, make people depressed, be sleepy straws. In vitro radiation mainly refers to the radiator direct exposure to natural stone in the human body to produce a biological effect, will cause damage on the human body's hematopoietic organs, nervous system, reproductive system and digestive system.
Marble radioactive material radon, harmful to the human bodyRadon is a colorless and odorless undetectable inert gas. The cement, brick Rizal, marble, tiles and other building materials is the main source of radon geological fault zone will also have a lot of radon. Radon in the air enter the body, or attached to the tracheal mucosa and lung surface, or enter into body fluids tissue formation in vivo radiation induced lung cancer, leukemia and respiratory disease. The WHO research shows that radon is only to lung cancer caused by smoking second carcinogens.
In order to protect the physical and mental health of the people, the natural stone products are divided into three categories: A, B, C.A class a product can be used in any situation, including office and family rooms;Class B product radioactivity level higher than Class A, can not be used in the interior of the room, can be used for all other buildings in the interior and exterior decoration;C class product radioactivity level is higher than A, B two kinds, can only be used for building exterior decoration.More than C standard control value of natural stone, can only be used for the seawall, piers and stone and other purposes.
