1. Compared with other radiation sources inside and outside the house, the radioactivity of granite countertops poses little risk to human body. A few years ago, regarding the natural granite countertops for residential use, the radioactivity of granite countertops poses little risk to the human body from other radiation sources inside and outside the house.
2. Granite is a kind of stone with high possibility of containing radioactive elements, but not all granites contain high radiation. Generally speaking, granite will not be used as interior decoration materials, and the stone materials for interior decoration are mostly marble, so it is less likely that radioactive elements will exceed the standard.
In fact, stones are radioactive, which depends on the content of radioactive elements. It should be treated scientifically based on the test data. As long as the stone does not exceed the standard of Radionuclide Limit of Building Materials (GB6566-20 10), it is safe.
4. The standard divides natural decorative stone into three grades according to the radiation intensity. The production, sale and use of Class A decorative materials are not restricted, and can be used for decoration anywhere.
5. Class B decoration materials can not be used for the interior decoration of civil buildings, but can be used for the exterior decoration of civil buildings and the interior and exterior decoration of all other buildings.
6. Class C decoration materials can only be used for external decoration and other outdoor purposes of buildings, and their sales must be restricted, that is, they can only be used for outdoor decoration.
7. According to the test, different colors of stone materials have different radioactivity, generally with high dark radiation and low bright radiation. The highest ones are red and green, and the lowest ones are white and black. Therefore, we should carefully choose red, green or red granite varieties.
Extended data:
Granite procurement:
1. Check whether the stone provided is natural stone, and whether its material performance meets or is better than that of natural granite (JB/T 7974—200 1).
2. Quality inspection requirements: specified value or allowable deviation of overall dimensions: length ≤ 1mm, width and thickness ≤ 1mm, surface flatness ≤0.5mm and diagonal ≤ 0.5 mm..
3. Whether the appearance quality of granite platform is superior, and whether the color, color difference and pattern of block are harmonious and unified.
4. Whether there are any appearance defects such as missing edges, corners, cracks, spots, color lines and pits on the platform surface.
5. Whether the platform surface is coated with six-sided stone protective coatings to ensure the waterproof and antifouling performance of the stone.
6. Whether the stone has passed the relevant tests of the National Stone Quality Monitoring Center, including physicality, radioactivity and freeze-thaw. , and have the relevant inspection report.
7. Origin and name of the stone.
References:
Granite _ Baidu Encyclopedia?