Atmospheric Transport of X-Rays.
GULF ENERGY AND ENVIRONMENTAL SYSTEMS INC SAN DIEGO CALIF
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Due to the lack of measured data for checking calculational results, an experimental program was initiated at Gulf General Atomic GGA for studying the atmospheric transport properties of X-rays by using liquid nitrogen to simulate air. Measurements of the photon spectrum and angular distribution were made as a function of source-detector separation distance in an infinite medium of liquid nitrogen provided by a large cryogenic dewar. Radioactive isotopes of 241Am, 141Ce, and 203Hg were used as sources of approximately monoenergetic photons with energies of 60 keV, 145 keV and 279 keV, respectively. A 20 cc cm GeLi detector was used to measure photon spectra for energies from approximately 20 keV to the source energy. Measurements were made for source detector distances of 1-15 mfp for each source energy. Transport calculations were made for comparison with the measurements using the PHOTRAN Monte Carlo code and the 1DF discrete ordinates code. Author
- Atmospheric Physics