Experts talking about the radioactive granite countertops
    Granite countertops, thus far, and "radioactive radiation" often linked to many would like to use the granite panels because " granite panels radioactive" flinch at the sight, which has been in use granite panels of the people are on tenterhooks, readers often call to where the detect radioactive of granite panels? If the home has granite panels of the how to do? Anxious meaning was written on his face. Radioactive of granite panels in the end is how one thing, can rest assured that they will use at home, the reporter recently visited the Chinese Geology University (Beijing) Application of the geophysical Associate Professor Hou victory.
    Any decorative materials are natural radioactivity, only exceeded the standard only harm. Professor Hou said: nature of any substance contains natural radioactive elements, but in different substances in different radioactive elements. We in the environment surrounding soil, water or air are radioactive elements, non - decorative stone construction materials such as cement, steel, bricks, floor tiles, panels and granite countertops as they contained radioactive elements. Take brick, it is clay and other materials from manufactured from, clay is formed by the weathering of rock, clay and granite panels, like granite countertop are naturally formed, if the radioactive elements in the clay is relatively high, then by firing in the brick radioactive elements will also correspondingly high, so that only granite panels contain radioactive and other materials do not contain radioactive view is not correct. The Ministry of Health has long issued the "Health Protection standard building materials", the construction materials of natural radioactive elements in the activity has also been limited requirements to ensure that the use of security. 80% of the granite panels can be assured in the indoor use of low radioactive granite panels can radiation shielding other materials
    When a reporter asked about what granite stone suitable for use at home, how to choose, said Professor Hou: As early as the 1993 national building materials Council promulgated the "natural granite stone products Radiological Protection Classification control standards," according to the natural radioactive granite stone was high or low levels of classification, will be days Ran granite stone is divided into A, B, C three categories of products, Class A product can be used in any occasion, B products can be used in addition to room interiors of all buildings other than the internal and external finishes and industrial facilities, C standard only as a granite stone buildings outside finishes. From our nearly 200 samples of the test results, 80% of the granite stone samples belong to any occasion can be used in category A granite stone. Among them were part of the granite stone radioactive content very low, or even than ordinary cement floors, brick radioactive content also low, in the indoor use of this granite countertop can play a role in shielding to reduce indoor total radiation, have environmental protection role.
    Because some people lack the knowledge radioactive, have formed a number of one-sided understanding, as some people now think light-colored granite panels than dark-colored granite panels of radioactive low, in fact it is not absolute, and many T dark granite panels (such as red) no higher than the level radioactive Class A the required standards, than some light-colored granite panels also low, which we have done in the test can be proved.
How to detect radioactive indoor whether beyond of standard.
    How to detect indoor materials whether out of standard many people concerned about. According to Professor Hou, conventional testing methods mainly indoor gamma radiation energy spectrum analysis and chemical analysis method to test the samples grind, like closure, analysis cycle in 20 days or so, long life cycle cost analysis also relatively high. In view of this situation, at the national quality monitoring center stone, with the support of China University of Geosciences (Beijing) and the application of geophysical Stone Industry Association, China has been developed China's first radiation detector Stone measurement method and its related technologies, and adopted a national building materials, the experts, quality and Technical Supervision in Beijing was awarded the certificate. Reporters in the Department of Geology University geophysical see this apparatus, equipped with instruments like a probe flashlight, a small outer display tester, this portable device which can be taken to the test site, does not require destruction of finished products can be placed directly on the testing range is 50 × 50 cm , and detection time is short, generally require about 10 minutes can be measured. Finally, Professor Hou said that the home environment as a whole, as long as the macro-environment of radioactive indicators up to standard, would not have an impact on the human body, not for fear of a certain kind of radioactive are beyond standard and materials for the blind removed the waste and unnecessary trouble.
"Beijing Youth Daily"