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Extra info for Fluence-Based and Microdosimetric Event-Based Methods for Radiation Protection in Space (Ncrp Report, No. 137)

Example text

For a limited range of LET and particle types, the cross sections are expected to vary smoothly with the atomic number (Z). This will give confidence that the total data set depicting the dependence of the risk cross sections on LET (or energy) will fit into a coherent picture. This will keep the amount of data to be collected to a minimum. LET spectra can be easily calculated for use with the conventional risk assessment method. In fact, one can consider the fluence-based approach as just the conventional approach reoriented to emphasize particle fluence rather than absorbed dose, with the additional feature that different ‘‘quality weighting’’ functions are provided for each particle type, thus allowing different risks from different particle types having the same LET.

This study estimated the initial slope of the relationship between tumor yield and irradiation dose. 6 keV ␮m‫מ‬1) and 56Fe ions (350 MeV amu‫מ‬1, 253 keV ␮m‫מ‬1; and 600 MeV amu‫מ‬1, 193 keV ␮m‫מ‬1) and were compared to 60Co gamma-ray data. 3, 20 and 40, respectively. Preliminary data for several additional ions are also reported including neon (25 keV ␮m‫מ‬1) and niobium (464 keV ␮m ‫מ‬1 ). , 1994). The data from these experiments were used to calculate fluencebased risk coefficients expressed as cross sections.

This would yield linear fluence-response curves. The second requires knowledge of the incident particle energy spectra of identified particles plus the use of radiation transport codes (adequately validated) to transport the radiation through known shielding configurations to the points of interest. The spectra can be obtained either from prior knowledge of the environment (for risk prediction purposes) or from appropriately placed particle spectrometers outside the spacecraft or habitat (for risk assessment purposes).

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