Study of naturally occurring radionuclides in the ECHo set-up A. Göggelmann, J. Jochum, L. Gastaldo, F. Mantegazzini, A. Barth and R. Hammann Eur. Phys. J. C, 82 2 (2022) 139 Published online: 15 February 2022 DOI: 10.1140/epjc/s10052-022-10112-7