The Krasnoyarsk region mineral sources radiation safety for farm animals

The purpose of the study is to determine the radiation safety of the sources of mineral substances in the Krasnoyarsk Region used for feeding farm animals. The objects of study are the raw materials of the Krasnoyarsk Region used in the diets of farm animals. The specific activity of NRN in belite sludge, an industrial waste from the Achinsk alumina refinery, was estimated; oxidized brown coal of the Balakhtinskoye deposit and vermiculite of the Tatar deposit. Determination of the specific activity of natural radionuclides was carried out in the conditions of the radiation monitoring laboratory "SHANECO Sibir". Measurements of the specific activity of NRN in the samples were carried out on a gamma spectrometer MKGB-01 RADEK and a dosimeter-radiometer MKS-AT6130. Regulatory and methodological documentation that determines the procedure for performing measurements: GOST 30108-94 “Construction materials and products. Determination of specific effective activity of natural radionuclides”; Methodology for measuring the specific activity of natural radionuclides, cesium-137, strontium-90 in samples of environmental objects and products of enterprises using the spectrometer-radiometer of gamma and beta radiation MKGB-01 RADEK and the gamma spectrometer MKSP-01 RADEK (certified FSUE VNIIM, certificate No. 126/210-(01.00250-2008)-2011). Measurement conditions: Tair = +20…21 °C, P = 743-746 mm Hg. Art., humidity - 25 %. The measurements were carried out in the geometry of the Marinelli vessel, the measurement time was 3600 s, the ambient dose equivalent rate of gamma radiation on the surface of the container (counting sample) was 0.10-0.11 μSv/h (without deducting the gamma background of the measurement site). Samples of mineral substances based on the results of gamma spectrometry, according to paragraph 5.3.4. SanPiN 2.6.1.2523-09 "Radiation Safety Standards NRB-99/2009", in terms of radiation safety, they refer to class I materials. The effective activity of natural radionuclides (Aeff) of belite sludge is less than 51.6 Bq/kg; vermiculite - 126.2±11.1; oxidized brown coal - less than 28.5 Bq/kg. According to SanPiN 2.6.1.2800-10, the tested sources of mineral substances are classified as industrial waste of the 1st category. Belite sludge is an industrial waste of the Achinsk alumina refinery, oxidized brown coal of the Balakhta deposit, vermiculite of the Tatar deposit do not increase the total absorbed dose of farm animals, this allows them to be used as a feed additive.