In 2015, a well-known Chinese evening newspaper published an article titled "Is a large natural marble at home the Suspected culprit of a couple suffering from lung cancer six months apart?" The report of... The article mentioned that the two elderly people do not smoke, the usual diet is also very healthy, but also adhere to exercise, but within six months has been diagnosed with lung cancer in the late stage. When the doctor helped trace the cause, he found that the old man's home decoration was more luxurious, and he used a very large natural marble, and the doctor suspected that the problem was on this marble.
How on earth is marble linked to lung cancer? The problem is a radioactive inert gas called radon. Radon is the only natural radioactive inert gas produced by the decay of radioactive elements such as radium and thorium. It is colorless and odorless and can be found in stones, soil and water. Radon gas is currently recognized as the second leading cause of lung cancer after tobacco. The amount of radiation caused by radon to the human body accounts for about 55% of the total amount of radiation received by the human body in a lifetime, and the World Health Organization lists it as one of the 19 major environmental carcinogens. The relative risk of lung cancer is linearly related to the level of radon exposure. Statistics show that about 50,000 people die from radon-induced lung cancer in China every year.
It seems plausible, then, that radon radiation in marble can cause cancer. So how much radon is in marble? Is it really enough to cause cancer? Is there a cancer risk from using marble in home improvement?
Experts said that residents do not have to worry too much about the marble decoration in the home, the presence of marble does not mean that it will release excessive radon, and, in general, the probability of indoor radon exceeding the standard is very small. In fact, as early as 2013, the China Stone Association, the National Stone Quality Supervision and Inspection Center and the National Stone Standardization Technical Committee jointly issued the "Notice on the non-radioactive hazards of marble products to the human body", which explained that marble is mainly composed of carbonate minerals, and the formation process is not directly related to radioactive substances. No radioactive hazard to human body. As for the radiation amount of radioactive substances in marble, at the release of the "China Natural Marble White Paper" held in Xiamen in 2014, the president of the China Stone Association said that everything in nature may actually have a certain amount of radioactivity, but it is necessary to distinguish whether this radioactivity is harmful to the human body. Various stone products made of natural marble will not cause any radioactive harm to the human body. China National Stone Quality Supervision and Inspection Center in the past 10 years on the market commonly used more than 100 kinds of domestic and imported marble samples conducted radioactivity test results show that the average radionuclide specific activity of all tested marble samples is 0.02. It is only one-fiftieth of the category A index in the national standard "Radionuclide Limit for Building Materials" (the scope of production, marketing and use is not restricted), which is completely negligible.
It can be seen that the claim that marble radiation causes cancer is indeed exaggerated. Compared with the international radioactivity indicators, China's indicators are relatively strict, but in recent years, the relevant departments have cancelled the radioactivity detection of marble, which fully explains the safety of domestic marble products. Therefore, consumers can rest assured to buy marble products in the process of home improvement. However, it is recommended that consumers in the purchase of stone decoration materials, still remember to check its analysis by the State Bureau of Technical Supervision of the test qualification of the "CMA radioactive analysis test certificate" and the scope of application of the product, and buy products produced by regular manufacturers.
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