Abstract
Data were presented comparing the absorbed dose in tissue exposed to beams of fast neutrons as measured by ion chambers and tissue-equivalent proportional counters. The fast neutron beams studied include 14 MeV monoenergetic beams and those generated by high energy deuterons incident on beryllium. The ion chamber approaches include the tissue-equivalent plastic, tissue-equivalent gas and polyethylene wall-ethylene gas systems. The proportional counters were of the tissue-equivalent wall-tissue-equivalent gas type. Sources of uncertainty were discussed, including values of stopping power ratios, W for the gases, differences in atomic composition between the wall and the gases, and separation of the photon component of the total dose.
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