The occupational health effects of exceeding the guidelines may have various consequences, depending on how far the guidelines have been exceeded, such as nausea, vomiting and fatigue, diarrhea, reduction in lymphocytes and neutrophils, hemmorhage, inflammation of mouth and throat, fever and death. Once the allowable dose limit is set, the minimum equivalent aluminum shell thickness can be determined by reading from Figures 4, 5, and 6. Note that for the same allowable dose limit the shielding thickness required for GEO is about an order of magnitude higher than that required for LEO. Radiation in a space vehicle can be reduced below the levels shown in Figures 4, 5, and 6 by using a sandwich method fusing different metals; i.e., aluminum and lead. Sandwich metal walls will work to lower the Bremsstrahlung radiation as well as to lower the overall radiation as compared to straight aluminum. The drawback is in the weight problem of the metals. A great deal more research and development into the makeup of the walls of the various spacecraft will be necessary. This will be needed to determine the dose to a space worker on his long-term stay (perhaps 6 months) in space. Also, a designed ’’storm cellar” will be needed for any time there is a solar flare. This is needed to survive the storms due to the large increase in radiation. A ’’storm cellar" would have extremely thick walls and give the personnel the protection needed.
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