Recently, the reporter learned from the Municipal Quality Supervision Bureau that the quality of stone products in our city has been steadily improved, and radioactivity is no longer a stumbling block to the upgrading and development of the stone industry in our city. Before 2006, the qualified rate of sampling quality of national, provincial and prefecture-level stone products in our city has been low, and the awareness of product quality is weak. The lack of understanding or misunderstanding of stone radioactivity is widespread. In order to completely change the situation of the low quality of stone products in our city, the Provincial Quality Supervision Bureau held a special quality analysis meeting for stone products in the city in June 2007, and at the same time issued a special rectification task for stone products quality that lasted for 3 years. . The special rectification work for the quality of stone products, the Yunfu Municipal Government attaches great importance to it. After one and a half years of rectification, the quality of stone products in our city has been greatly improved.
According to the statistics of the Municipal Quality Supervision Bureau, the qualified rate of quality inspection of stone products in our city has increased from 22% in 2001 to 85.56% in 2008. The coverage of random inspection enterprises has also increased from 2.5% in 2001 to 82.8% in 2008. The radioactive classification mark (sales) of stone has already begun to show results. At present, among the stone products sold in the market, more than 250 marble varieties, more than 10 sandstone varieties, and artificial granite and quartz stone are all national regulations. For Class A products subject to restricted use, more than 78% of the more than 320 granite species belong to Class A products, about 20% of granite belongs to Class B products, and only 2% of granite belongs to Class C products. And super C products. In order to standardize the classification and labeling (sales) of stone products in our city, with the strong support of the municipal government, the stone enterprises in our city have basically been able to post radioactive classification marks or issue product quality inspection reports in accordance with relevant national regulations.
Nowadays, many media have reported inaccurate reports on the radioactivity of stone, saying that the radioactivity exceeding the standard is misleading consumers. According to experts from the Guangdong Provincial Stone Products Quality Supervision and Inspection Station: virtually all inorganic non-metallic materials (such as cement, sand, clay, red brick, glass, ceramics, stone, etc.) are radioactive, but most of the inorganic Non-metallic materials have low levels of radioactivity and do not endanger human health. Whether the radioactivity of building materials has reached the endangered human health, China, Russia, the European Union, the United States, Japan and many other countries have standard regulations. According to the national mandatory standard GB6566-2001 "Limits of radionuclides for building materials", granite, ceramic tiles and other building decoration materials are sold according to the internal and external exposure index, A, B, C and super C. use. Class A products are not restricted in terms of production, sales and use; Class B products are not used in the interior of Class I civil buildings such as houses, schools, nurseries, senior apartments, hospitals, etc., but can be used for exterior finishes of Class I civil buildings and others. The inner and outer finishes of all buildings; Class C products can only be used for exterior finishes of buildings and other outdoor applications; Super C products can only be used in places such as seawalls, piers and monuments that are rarely touched by humans. That is to say, each type of product has its scope of use, and there is no such saying that "radioactivity exceeds the standard".
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