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Radiation Protection Studies of International Space Station Extravehicular Activity Space SuitsThis publication describes recent investigations that evaluate radiation shielding characteristics of NASA's and the Russian Space Agency's space suits. The introduction describes the suits and presents goals of several experiments performed with them. The first chapter provides background information about the dynamic radiation environment experienced at ISS and summarized radiation health and protection requirements for activities in low Earth orbit. Supporting studies report the development and application of a computer model of the EMU space suit and the difficulty of shielding EVA crewmembers from high-energy reentrant electrons, a previously unevaluated component of the space radiation environment. Chapters 2 through 6 describe experiments that evaluate the space suits' radiation shielding characteristics. Chapter 7 describes a study of the potential radiological health impact on EVA crewmembers of two virtually unexamined environmental sources of high-energy electrons-reentrant trapped electrons and atmospheric albedo or "splash" electrons. The radiological consequences of those sources have not been evaluated previously and, under closer scrutiny. A detailed computational model of the shielding distribution provided by components of the NASA astronauts' EMU is being developed for exposure evaluation studies. The model is introduced in Chapters 8 and 9 and used in Chapter 10 to investigate how trapped particle anisotropy impacts female organ doses during EVA. Chapter 11 presents a review of issues related to estimating skin cancer risk form space radiation. The final chapter contains conclusions about the protective qualities of the suit brought to light form these studies, as well as recommendations for future operational radiation protection.
Document ID
Document Type
Technical Publication (TP)
Cucinotta, Francis A. (NASA Johnson Space Center Houston, TX, United States)
Shavers, Mark R. (NASA Johnson Space Center Houston, TX, United States)
Saganti, Premkumar B. (Prairie View Agricultural and Mechanical Coll. TX, United States)
Miller, Jack (California Univ., Lawrence Berkeley National Lab. Berkeley, CA, United States)
Date Acquired
September 7, 2013
Publication Date
December 1, 2003
Subject Category
Space Radiation
Report/Patent Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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NameType 20040031719.pdf STI