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Sort Title : Report No. 137
ISBN : ISBN 0-929600-70-3
Scientific Committee :
Report No. 137 (2001) describes how long-term space missions of the future will subject space travelers to a unique radiation environment not experienced by Earth-bound populations. The space radiation environment is dominated by high-energy protons, helium ions, and to a lesser extent heavier ions. These particles are highly penetrating and many can traverse the shielding provided by the spacecraft and the self-shielding of the travelers' bodies. This circumstance plus the nuclear fragmentation of those particles that do interact create a radiation environment containing a relatively large component of highly ionizing radiation. Because it is known that different biological effects can occur from different particles of the same linear energy transfer (LET), it was suggested that perhaps introducing another formulation allowing explicitly for the variation of risk with particle type as well as LET might provide advantage over the conventional treatment utilizing the singled-valued quality function versus LET formulation. Report No. 137 explores two possible methodologies to circumvent this problem, the fluence-based approach and the microdosimetric approach. A description of the methodologies is presented, and advantages and disadvantages of each are identified.
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Book | PDF, Hard copy, Hard copy & PDF |