1. Beck H, de Planque G (1968) The radiation field in air due to distributed gamma-ray sources in the ground. Report HASL-195. Health and Safety Laboratory. US Atomic Energy Commission, New York
2. Bell GI, Glasstone S (1970) Nuclear reactor theory. Van Nostrand Reinhold Company, New York
3. Brown JE, Alfonso B, Avila R, Beresford NA, Copplestone D, Pröhl G, Ulanovsky A (2008) The ERICA Tool. J Environ Radioact 99(9):1371–1383
4. Eckerman KF, Ryman JC (1993) External exposure to radionuclides in air, water, and soil. Federal Guidance Report No. 12. EPA-402-R-93-081. US Environmental Protection Agency, Washington, DC
5. Hillmann U, Schimmack W, Jacob P, Bunzl K (1996) In situ gamma-spectrometry several years after deposition of radiocesium. Part I. Approximation of depth distributions by the Lorentz function. Radiat Environ Biophys 35(4):297–303