REFERENCES Lowder, W. M., Beck, H. L., and Condon, W. Spectrometric Determination of Dose Rates Nature, 202, 745-749 (1964) J. Beck, H. L., Condon, W. J., and Lowder, W. M. Spectrometric Techniques for Measuring Environmental Gamma Radiation USAEC Report HASL-150, October (1964) Beck, H. Condon, L., W. Lowder, W. M., Bennett, B. G., and J. Further Studies of External Environmental Radiation USAEC Report HASL-170, March (1966) Beck, H. L. Environmental Gamma Radiation from Deposited Fission Products, 1960-1964 Health Physics, 12, 313-322 (1966) Beck, H. L. and de Planque, G. The Radiation Field in Air Due to Distributed Gamma-Ray Sources in the Ground USAEC Report HASL-195, May (1968) Gale, H. J., Humphreys, D. L. U., and Fisher, The Weathering of Caesium 137 in Soil AERE-R-4241, July (1963) M. R. a Long Term cpaAishasme AIS mere Squire, H. M., and Middleton, L. Jd. Behaviour of Cs’°” in Soils and Pastures; Experiment Radiation Botany, 6, 413-423 (1966) E. -~ 44 - oe por eeEE agn RT ‘ *