Solar particle event organ doses and dose equivalents for interplanetary crews: variations due to body size

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Proper assessments of spacecraft shielding requirements and concomitant estimates of risk to critical body organs of spacecraft crews from energetic space radiation require accurate, quantitative methods of characterizing the compositional changes in these radiation fields as they pass through the spacecraft and overlying tissue. When estimating astronaut radiation organ doses and dose equivalents it is customary to use the Computerized Anatomical Man (CAM) model of human geometry to account for body self-shielding. Usually, the distribution for the 50 th percentile man (175cm height; 70kg mass) is used. Most male members of the U. S. astronaut corps are taller and nearly all have heights that deviate from the 175cm mean. In this work, estimates of critical organ doses and dose equivalents for interplanetary crews exposed to an event similar to the October 1989 solar particle event are presented for male body sizes that vary from the 5 th to the 95 th percentiles. Overall the results suggest that calculations of organ dose and dose equivalent may vary by as much as ∼15% as body size is varied from the 5 th to the 95 th percentile in the population used to derive the CAM model data.