1. N. P. Laverov, M. V. Shumilin, I. V. Mel’nikov, and I. A. Luchin, Geologist’s Handbook for Prospecting and Exploration of Uranium Deposits (Nedra, Moscow, 1989) [in Russian].
2. V. I. Baranov and N. A. Titaeva, Radiogeology (Mosk. Gos. Univ., Moscow, 1973) [in Russian].
3. E. V. Bugaev, A. Misaki, V. A. Naumov, T. S. Sinegovskaya, S. I. Sinegovsky, and N. Takahashi, Phys. Rev. D 58, 054001 (1998).
4. N. Agafonova et al. (LVD Collab.), Phys. Rev. D 100, 062002 (2019).
5. N. Yu. Agafonova (on behalf of the LVD Collab.), arXiv: 1701.04620