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aluminum shield 0.5 Alva August 1972 SPE average breast exposure BFO Avg body self-shielding breast cancers breast centerline Breast Geometry Breast in Space breast is developed breast size breast tissue cosmic radiation Council on Radiation Dose equivalent exposure February 1956 SPE February 23 female breast finite-tissue equivalent slab g/cm glandular tissue high-energy Johnson Space Center Langley Research Center long-term missions mandate low Earth orbit magnetic-storm conditions male model mandate a priori Mark Shavers model considers geomagnetic model include proton NCRP Rep Onset organs BFO Performing Organization Poston Protection and Measure radiation exposure Radiation Protection Radionuclides recently developed proton relatively high radiosensitivity Research Center Hampton Rockwell International Shavers and John single parameter allowing Solar Cosmic Ray solar event solar flare Space Missions space suit Space Transportation Systems spacecraft orbital parameters spacecraft shielding stroma STS DLOC2 STS orbiter-shielding distribution surface along midline Texas A&M University truncated sphere placed William Atwell