“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 29, no. 120 (September 22, 2023): 328–323. Accessed August 8, 2026. https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/10774.