RETRACTED: Natural radioactivity of forest landscape soils Tatiana Kramareva, Nadezhda Gorbunova, Arkady Gromovik, Dmitry Lyubashevsky and Elena Kulikova E3S Web Conf., 420 (2023) 04015 Published online: 04 September 2023 DOI: 10.1051/e3sconf/202342004015