At present, the personalized decoration of the home has become a common trend of the urban middle class. Originally used for the natural stone of the building façade, the residential lobby and the public space of the hall, it began to enter a private home space. The high-grade stone has natural patterns and beautiful colors, which can provide interior designers with a wide range of creative elements. However, in daily use, many people often neglect reasonable maintenance, and there are many misunderstandings.
Last year, Lin Xiaoyu’s actor Chen Xiaoxu passed away. Some people were shocked that she was suffering from breast cancer due to the luxuriously decorated marble in her home. It caused a great uproar on the Internet. The stone radioactivity was even considered to be “indoor stealth killerâ€, which made it fearful to avoid it. . Although later medical experts came out to clarify, this speculation is not reliable. But is there any radioactive material in natural stone? Can it cause harm to people? It is still a problem that plagues many ordinary decorators.
Natural stone radiation is not terrible
There is almost no radioactive material in the material world, including soil, air, water and the human body itself. According to experts from global stone technology, the stone is taken from nature and contains radioactive materials that are positive and normal. Stone radioactivity mainly refers to the radioactive substances produced by the three radioactive elements of radium, thorium and potassium contained in the stone, which are mainly “氡†gas. According to the "Classification Control Standard for Radiation Protection of Natural Stone Products" issued by the National Building Materials Bureau in 1993, 80% of the stone samples are currently classified as Class A stones that can be used in any occasion.
Will the stone cause harm to the human body? Experts explain that the radioactive level of stone is low-dose radiation, and it cannot and will not lead to a deterministic effect soon (in the short term). "Because even the stone that exceeds the standard, the radiation emitted by the body is completely absorbed by the human body, it is also a low-dose irradiation, which is unlikely to be the chief culprit of infertility, nasal cancer, and laryngeal cancer." It is understood that the radiation value must be five years in a row. At 20msv, it will cause more damage to the human body. The probability of causing cancer with increasing dose is generally a few hundred thousandths, which is no more dangerous than taking a car or taking a train.
Good ventilation, effective radiation protection
Natural stone is often mistaken for the only "source of pollution" in the room and was demolished. In fact, the radon emitted by the ground soil is also one of the main sources of indoor radon concentration, so the radon content in the basement and semi-basement of bungalows and buildings is relatively high; and in the wall bricks made from coal ash slag, The amount of radioactive material is sometimes higher than some granites. In the paints and decoration materials used in interior decoration, the release of formaldehyde and benzene is also very harmful to the human body. In addition, a small amount of micro-radiation is released from TVs, refrigerators, computers, air conditioners, and microwave ovens.
“Maintaining good ventilation in the room is the easiest and most effective way to eliminate all radiation.†In the interview, experts said that if you do not understand the state of radioactive materials in natural stone, or mistakenly mistake the “B†stone (can be used in the room) The interior and exterior finishes of all buildings outside the interior are not to be alarmed. According to him, as long as you pay attention to indoor ventilation and keep the indoor air fresh, such as every morning after getting up in the morning and every night before going to sleep every window for half an hour to one hour, many pollution problems can be easily solved.
Misunderstanding:
Determine the radioactivity size by color
Many people think that light-colored stone is more radioactive than dark stone. In fact, this is not absolute. The radiation of many dark stones (such as red) is not higher than the standard specified in Class A, and is lower than some light-colored stones. In fact, the source of stone radioactivity is mainly related to the magma formation process. It is related to the mine from which the material is taken, and is related to its chemical composition, but has no direct relationship with its color. Marbles, most of the slate, dark series (including black, blue, dark green) and gray series of granites have low radioactivity and can be confirmed as "Class A" products even without testing.
More than standard stone is a B product
According to national regulations, Class A, B, and C are all stone that meets the standards, but the scope of use is different. The so-called super-standard stone, most of which are Class B products, only a few of Class C products. In general, more than 80% of domestic stone materials are used to meet the needs of the people's home decoration. In fact, for the use of stone, such as stoves, window sills, etc., there is no need to consider the size of the radioactivity. In some places, it is unscientific to take the household inspection. Generally, it is required to be in a lead room with a thickness of about 100 mm (shield gamma ray) to eliminate the interference and accurately determine the stone type.
Stone conservation
Note three bogey
Avoid washing directly with water
Natural stone, like natural wood, is a porous material that breathes, so it is easy to absorb water or dissolve it through water to immerse it in pollution. If the stone absorbs too much water and pollution, it will inevitably cause various stone lesions, such as: cracking, weathering, falling off, floating, spitting yellow, water spots, rust spots, white Hua, matte surface and other annoying problems. Therefore, the stone should be washed away with water or washed with a mop. That is to use a good stone special protective agent, it is not possible to block pollution for a long time, so immediately remove the pollution.
Avoid contact with non-neutral items
All stones are afraid of acid and alkali. For example, acid often causes oxidation of sulphur iron minerals in granite to cause spitting. The acid will decompose the calcium carbonate contained in the marble, causing the surface to be eroded. The alkali will also erode the feldspar and quartz in the granite. The grain boundary of the crystal of the object causes the phenomenon of grain peeling. For example, non-neutral detergents or water-based waxes, oily waxes, acrylic waxes and other waxes generally contain acid and alkali. If used for a long time, the surface gloss of the stone will be lost, and residual chemicals will cause future stone lesions.
Avoid long-term cover debris
In order to keep the stone breathing smoothly, it should avoid covering the carpet and debris for a long time on the stone surface. Otherwise, the moisture under the stone cannot be volatilized through the pores of the stone. Then the stone will be annoying stone lesions due to excessive moisture and increased water content. If you must lay carpets and pile up debris, please don't forget to keep it clean and clean. From time to time, dust collectors and electrostatic drags are used for dust removal and cleaning. Whether it is hard granite or soft marble, it is not resistant to sand and soil particles.
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