28 thn etal REETSe Selle sane base tee 7. Gustafson, F., Kastner, J., and Luetzelschwab, J. Environmental Radiation Measurement of Dose Rates Science, 145, 44-47 (1964) 8. Beck, Harold L. Environmental Gamma Radiation from Deposited Fission Products, 1960-1964 Health Physics, 12, 313-322 (1966)