Cosmic-Ray Tracks in Plastics: The Apollo Helmet Dosimetry Experiment

Science  09 Apr 1971:
Vol. 172, Issue 3979, pp. 154-157
DOI: 10.1126/science.172.3979.154


Counts of tracks from heavy cosmic-ray nuclei in helmets from Apollo missions 8 and 12 show variations caused by solar modulation of the galactic cosmic-ray flux. Specific estimates of the biological damage to certain nonreplaceable cells by track-forming particles during these space missions indicate that the fraction of deactivated cells could range from a lower limit of 3 x 10-7 to an upper limit of 1.4 x 10-4.