Natural stone 1 Scope This standard applies to natural granite, marble and slate used as building main body, building decoration and decoration materials, and paving stones; this standard does not apply to natural stone used in contact with food. 2. Reference standard The provisions contained in the following standards constitute provisions of this standard by reference in this standard. The versions shown are valid at the time of publication. All standards will be revised and parties applying this standard should explore the possibility of using the latest version of the following standards. GB6566-2001 Radionuclide limited edition of building materials GB/T9966.3-2001 Test Methods for Natural Finished Stones - Test Method for Bulk Density, True Density, True Porosity, Water Absorption Rate 3. Definition This standard uses the following definition 3.1 Internal exposure index The internal exposure index in this standard refers to the specific activity of the natural radionuclide radium-226 in natural stone, divided by the limit specified by the national standard. The expression is: IRa= CRa/200 In the formula: IRa - internal exposure index; CRa - the specific activity of the radioactive natural radionuclide radium-226 in natural stone, in Baker/kg (Bq·kg-1) 200——Only consider the radioactivity specific activity limit of natural radionuclide ra-226 in natural stone specified by national standard, in Beck/kg (Bq·kg-1). 3.2 External exposure index The external exposure index in this standard refers to the sum of the radioactive specific activities of natural radionuclides ra-226, é’-232, and potassium-40 in natural stone divided by the limits specified by national standards when they are separately present. . The expression is: In the formula: Iγ - external exposure index: CRa, CTh, CK————The specific radioactivity of natural radionuclides radium 226, é’-232 and potassium-40 in natural stone, the unit is Beck/kg (Bq·kg-1). 370, 260, 4200 - respectively, only the external exposure, the natural radionuclides in the natural stone specified by the national standards, radium-226, é’-232, and potassium-40, are specified in the national standards when they exist separately. The unit is Beck/kg (Bq·kg-1). 3.3 Radioactivity specific activity The radioactivity specific activity of a certain nuclides refers to the quotient of the radioactivity of a certain nuclides in a substance divided by the mass of the substance. expression: In the formula: C——specific activity of radioactivity, the unit is (Bq·kg-1); A——nuclear radioactivity, in units of Bq; m - the mass of the substance in kilograms of kg. 4. Evaluation criteria 4.1 Environmental Behavior Assessment Project 4.1.1 Waste treatment Corporate pollutant emissions must meet the requirements of national or local pollutant discharge standards. The production plant shall have measures to properly treat the discharged stone powder and waste materials so as not to cause pollution and damage to the surrounding environment or personal health. Inspection method: The document reviews the monitoring report of the local environmental protection department, and checks the corresponding equipment and measures on site. 4.1.2 Saving water resources The cooling water of the production plant must use the circulating water system. After the cooling water is precipitated, it can be reused and cannot be discharged at will, avoiding waste of water resources. Inspection method: On-site inspection of the corresponding regulations, facilities, and water-saving effects. 4.1.3 Saving stone resources Manufacturers should not discard the non-conforming products and scraps, and have specific measures to reuse them (for example, stone pavers, stone mosaics, artificial pebbles, etc.). Inspection method: The document is reviewed for the existence of such regulations, purchase and sales contracts and other similar documents, and the corresponding measures and results are on-site. 4.1.4 Saving energy The production equipment of the enterprise meets the requirements of low energy consumption, and the production efficiency has reached the domestic advanced level. Inspection method: Document the corresponding certification documents, check the production efficiency level of production equipment on site, and evaluate the energy consumption ratio of finished products. 4.2 Product Specifications 4.2.1 Radioactivity The internal and external exposure indices of the product must be met simultaneously: IRa≤0.7 Iγ≤1.0 4.2.2 Water absorption rate The water absorption of the product should be less than or equal to 0.50% 4.3 quality standards Other technical indicators of the product must meet the requirements of the corresponding product quality standards. 5. Inspection 5.1 radioactivity The radioactive detection of the product is carried out in accordance with the method specified in GB6566-2001. 5.2 water absorption rate The water absorption rate of the product is carried out in accordance with the method specified in GB/T9966.3-2001. 5.3 Environmental standards and quality standards The environmental standards and quality standards of the products are carried out in the form of review documents. 6. Non-assessment comprehensive evaluation reference project 6.1. Energy conservation: As a non-assessment item inspection, depending on the company's situation. 6.2, water absorption rate: slate, sandstone, travertine marble as a non-assessment item inspection.
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