TISSUE DOSAGES FROM ALPHA PARTICLES AND HEAVY NUCLEI IN SOLAR PARTICLE BEAMS IN SPACE.
NAVAL SCHOOL OF AVIATION MEDICINE PENSACOLA FLA
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Recordings of several large flare events indicate that solar particle beams contain, in addition to H and He, also heavy nuclei. For the November 13, 1960 flare in particular, complete rigidity spectra for H and He and C, N, O, F nuclei have been reported. Evaluation of these spectra in terms of tissue depth doses behind 0.1 gsq cm. shielding shows that, while the He component contributes substantially to exposure in near-surface regions, the dose fraction of the medium heavy component remains, even in the tissue surface, on the level of a few per cent. In view of the smallness of this contribution, it seems unnecessary to extend the spectral resolution of LET sensors up to the Bragg peaks of medium heavy nuclei 1000 kevmicron T. Author