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Estimation Of Organ Doses From Solar Particle Events For Future Space Exploration MissionsRadiation protection practices define the effective dose as a weighted sum of equivalent dose over major organ sites for radiation cancer risks. Since a crew personnel dosimeter does not make direct measurement of the effective dose, it has been estimated with skin-dose measurements and radiation transport codes for ISS and STS missions. If sufficient protection is not provided near solar maximum, the radiation risk can be significant due to exposure to sporadic solar particle events (SPEs) as well as to the continuous galactic cosmic radiation (GCR) on future exploratory-class and long-duration missions. For accurate estimates of overall fatal cancer risks from SPEs, the specific doses at various blood forming organs (BFOs) were considered, because proton fluences and doses vary considerably across marrow regions. Previous estimates of BFO doses from SPEs have used an average body-shielding distribution for the bone marrow based on the computerized anatomical man model (CAM). With the development of an 82-point body-shielding distribution at BFOs, the mean and variance of SPE doses in the major active marrow regions (head and neck, chest, abdomen, pelvis and thighs) will be presented. Consideration of the detailed distribution of bone marrow sites is one of many requirements to improve the estimation of effective doses for radiation cancer risks.
Document ID
20060026148
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Kim, Myung-Hee
(Wyle Labs., Inc. Houston, TX, United States)
Cucinotta, Francis A.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Space Radiation
Meeting Information
Meeting: 11th Workshop on Radiation Monitoring for the ISS
Location: Oxford
Country: United Kingdom
Start Date: September 6, 2006
End Date: September 8, 2006
Distribution Limits
Public
Copyright
Other

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