Accession Number : AD0612029


Title :   GAMMA-RAY ENERGY AND ANGULAR DISTRIBUTIONS NEAR THE AIR/GROUND INTERFACE FROM PLANE FALLOUT AND POINT CO60 SOURCES,


Corporate Author : RADIATION RESEARCH ASSOCIATES INC FORT WORTH TEX


Personal Author(s) : French,R. L. ; Garrett,C. W.


Report Date : 01 JUN 1964


Pagination or Media Count : 30


Abstract : Monte Carlo techniques were applied in a detailed study of the gamma radiation environment three feet above the air/ground interface due to two types of gammaray sources: (1) fallout uniformly distributed on the ground surface, and (2) a Co60 point source also three feet above the ground at separation distances of 100 to 800 feet. In each case, the scattered and direct-beam fluxes were computed in each of ten receiver energy intervals between 0.04 and 3.5 Mev and eighteen equal receiver angle intervals between 0 (nadir) and 180 degrees (Zenith). All results were integrated over azimuthal angle at the receiver to reflect distribution in polar angle only. The source energy was used as a parameter in the fallout calculations and the results thus computed for each of ten different source energies may be weighted and combined to obtain data for fallout of any desired age. Comparisons of the Monte Carlo data with measured data and with other calculated data, both for fallout and for Co60 point sources, show favorable agreement. (Author)


Descriptors :   (*FALLOUT, GAMMA RAYS), (*GAMMA RAY SCATTERING, MONTE CARLO METHOD), (*MONTE CARLO METHOD, GAMMA RAY SCATTERING), SOURCES, COBALT, ISOTOPES, DISTRIBUTION, PHOTONS


Distribution Statement : APPROVED FOR PUBLIC RELEASE