Record Details

Characterization of the Radiation Shielding Properties of U.S. and Russian Extravehicular Activity Suits. Chapter 4
Offline Availability: Go to Request Form
Author and Affiliation:
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)
Abstract: Reported 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.
Publication Date: Dec 01, 2003
Document ID:
(Acquired May 27, 2004)
Document Type: Technical Report
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: Eril Research, Inc.; San Rafael, CA, United States
Description: 26p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
› Back to Top
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed
Find Similar Records
NASA Logo, External Link

NASA Official: Gerald Steeman

Sponsored By: NASA Scientific and Technical Information Program

Site Curator: STI Support Services

Last Modified: October 28, 2011

Privacy Policy & Important Notices Disclaimers, Copyright, Terms of Use Freedom of Information Act NASA OCIO Free Adobe PDF Reader Free MS Word Viewer