1. S. Kaiser, "Radiological protection principles concerning the natural radioactivity of building materials - Radiation Protection 112," Eur. Comm., pp. 1–16, 1999.
2. Arthur Y. Smith, "The Use of Gamma Ray Data To Define the Natural Radiation Environment," Int. At. Energy Agency, p. 49, 1990.
3. A. A. Abid, A. A. MraityHussien, A. A. Husain, and M. Wood, "Estimation of the excess lifetime cancer risk from radon exposure in some buildings of Kufa Technical Institute, Iraq," 51aep1a rpi3uKa ma e1epzemuKa, no. 18, 2 3, pp. 276–286, 2017.
4. Attributable risk of lung cancer deaths due to indoor radon exposure
5. G. Akerblom, L. Mjones, M. Annanmaki, S. Magnusson, T. Strand, and K. Ulbak, "Naturally Occurring Radioactivity in the Nordic Countries-Recommendations," Radiat. Prot. Authorities Denmark, Finland, Iceland, Norw. Sweden, pp. 50–64, 2000.