%0 Journal Article %T The Use of Natural Materials with a Low Content of Radionuclides as Protection from the External Background During Laboratory Gamma-Ray Spectrometric and Radiometric Measurements %A Povarov, V.P. %A Rosnovsky, S.V. %A Yurchenko, E.I. %A Karasev, V.N. %A Dobrynin, V.V. %A Sokolov, F.G. %A Smorodinov, A.A. %K gamma-ray spectrometry, radiometry, shielding, calcium carbonate, laboratory, radiation control %J ANRI %D 2025 %N 0 %P 8 %I Scientific-Production Enterprise “Dosa”