Measurements of natural radioactivity in soil samples collected in the Kampinoski National ParkAneta Łukaszek-Chmielewska, Martin Girard, Olga Stawarz, Barbara Piotrowska, Karol Wojtkowski and Krzysztof IsajenkoE3S Web Conf., 100 (2019) 00052DOI: https://doi.org/10.1051/e3sconf/201910000052