Measurement of radon Gas Concentrations and Radon Exhalation Rate in Cement Samples Using a Nuclear Trace Detector (CR-39). Journal of the College of Basic Education, [S. l.], v. 29, n. 120, p. 328–323, 2023. DOI: 10.35950/cbej.v29i120.10774. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/10774.. Acesso em: 6 jun. 2026.