Yasir Kh. Mohammad, Farqad F. Idan, Rajaa S. Najim, and Fareed M. Mohammed, “Concentration Of Radon In The Rain Falls In Salah-Din Province / Iraq”, JWSM, vol. 13, no. 2, pp. 23–31, Apr. 2020, doi: 10.31185/jwsm.472.