1. Moss, C. E., Health Physics, 25, 197–198, (1973).
2. Sodd, V. J., Velten, R. J., and Saenger, E. L., J. nucl. Medicine, 15, 534 (1974).
3. Lowman, F. G., Rice, T. R., and Richards, T. R. in Radioactivity in the Marine Environment (US National Academy of Sciences, 1971).
4. Merril Eisenbud, Environmental Radioactivity, second ed. (Academic, 1973).
5. Measurement of Low-Level Radioactivity, 1972 (International Commission on Radiation Units and Measurements, Report 22, 1972).