Content of radionuclides (226Ra, 232Th, 40K, 137Cs) in soils of the North-West region of Russia formed on three types of soil forming rocksElena Mingareeva, Boris Aparin, Elena Sukhacheva, Natalia Sanzharova, Evgeny Shevchuk, Vitaly Terleev, Aleksandr Nikonorov and Luka AkimovE3S Web Conf., 175 (2020) 09018DOI: https://doi.org/10.1051/e3sconf/202017509018