Optimization of 210Pb gamma-ray spectrometry determination in NORM samples Tereza Doksanská, Miroslav Hýža and Mahulena Kořistková Eur. Phys. J. Plus, 140 5 (2025) 432 Published online: 23 May 2025 DOI: 10.1140/epjp/s13360-025-06372-3