Continuous diurnal radon measurements in Bulgarian caves and dose assessment B. Kunovska, K. Ivanova, D. Djunakova, N. Chobanova, J. Djounova and Z. Stojanovska Eur. Phys. J. Spec. Top., 232 10 (2023) 1617-1623 Published online: 30 May 2023 DOI: 10.1140/epjs/s11734-023-00874-w