Natural radioactivityNatural radioactivityGenerally speaking aboutradioactivity of stone, the conversation should immediately be reduced to the radioactivity of granites. The fact is that granites were formed as a result of the effusion of magma, and therefore they contain a certain amount of radioisotopes, just like almost everything that is extracted from the earth's interior, for example, in concrete or tap water. As for various sedimentary and metamorphic rocks of sedimentary origin (marbles, limestones, sandstones, shales, quartzites, etc.), then it is generally incorrect to talk about their radioactivity. In Russia, there are "Radiation Safety Standards for the Population" under which all materials made of natural stone are divided into 3 radiosafety classes. Standardization is carried out according to the parameter "Specific Effective Activity". Materials classified as the first class are used in newly constructed residential and public buildings, while the specific effective activity (Aeff m) should not exceed 370 Bq / . The second class - materials used in road construction within the territory of populated areas and areas of prospective development, as well as in the construction of industrial facilities, Aeff m should not exceed 740 Bq/kg. For materials used in road construction outside populated areas and corresponding to the third class, Aeff m should not exceed 1500 Bq/kg.Radioactivity of stonesRadioactivity of stonesThere are two more classesradio safety. If the specific effective activity has a value from 1500 Bq/kg to 4000 Bq/kg (class IV), the possibility of using materials is decided in each case separately with the federal bodies of the State Sanitary and Epidemiological Supervision. If Aeff m exceeds 4000 Bq/kg, the materials should not be used in construction. Granite is allowed on the Russian construction market only with a special certificate. At the same time, wholesalers who care about their reputation, as a rule, play it safe and take samples of the purchased stone themselves. Thus, the possibility of using granites that do not comply with the "Radiation Safety Standards of the Population" is practically excluded.

Comments

comments