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Characterization of the Radiation Shielding Properties of U.S. and Russian Extravehicular Activity SuitsReported herein are results from the Eril Research, Inc. (ERI) participation in the JSC-sponsored study characterizing the radiation shielding properties of the two types of space suit that astronauts are wearing during the EVA on-orbit assembly of ISS. Measurements using passive detectors were carried out to assess the shielding properties of the U.S. EMU Suit and the Russian Orlan-M suit during irradiations of the suits and a tissue-equivalent phantom to monoenergetic proton and electron beams at LLUMC. During irradiations of 6 MeV electrons and 60 MeV protons, absorbed dose as a function of depth was measured using TLDs exposed behind swatches of the two suit materials and inside the two EVA helmets. Considerable reduction in electron dose was measured behind all suit materials in exposures to 6 MeV electrons. Slowing of the proton beam in the suit materials led to an increase in dose measured in exposures to 60 MeV protons. During 232 MeV proton irradiations, measurements were made with TLDs and CR-39 PNTDs at five organ locations inside a tissue-equivalent phantom, exposed both with and without the two EVA suits. The EVA helmets produce a 13% to 27% reduction in total dose and a 0% to 25% reduction in dose equivalent when compared to measurements made in the phantom head alone. Differences in dose and dose equivalent between the suit and non-suit irradiations for the lower portions of the two EVA suits tended to be smaller. Proton-induced target fragmentation was found to be a significant source of increased dose equivalent, especially within the two EVA helmets, and average quality factor inside the EMU and Orlan-M helmets was 2% to 14% greater than that measured in the bare phantom head.
Document ID
20040065983
Acquisition Source
Johnson Space Center
Document Type
Other
Authors
Benton, E. R.
(Eril Research, Inc. San Rafael, CA, United States)
Benton, E. V.
(Eril Research, Inc. San Rafael, CA, United States)
Frank, A. L.
(Eril Research, Inc. San Rafael, CA, United States)
Date Acquired
August 21, 2013
Publication Date
December 1, 2003
Subject Category
Man/System Technology And Life Support
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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