NDLI: Comparison of integrated radiation transport models with TEPC measurements for the average quality factors in space flights

Content Provider	IEEE Xplore Digital Library
Author	Kim, M.-H.Y. Hooshang Nikjoo Dicello, J.F. Pisacane, V.L. Cucinotta, F.A.
Copyright Year	2007
Description	Author affiliation: Univ. Space Res. Assoc., Houston (Kim, M.-H.Y.; Hooshang Nikjoo)
Abstract	The purpose of this work was to test our theoretical model for the interpretation of radiation data measured in space. During the space missions astronauts are exposed to the complex field of radiation type and kinetic energies from galactic cosmic rays (GCRs), trapped protons, and sometimes solar particle events (SPEs). The tissue equivalent proportional counter (TEPC) is a simple, time-dependent approach to radiation monitoring for astronauts on board the International Space Station. Another and a newer approach to microdosimetry is the use of silicon-on-insulator (SOI) technology launched on the MidSTAR-1 mission in low Earth orbit (LEO). In the radiation protection practice, the average quality factor of a radiation field is defined as a function of linear energy transfer (LET), $Q_{avg}(LET).$ However, TEPC measures the average quality factor as a function of the lineal energy y, $Q_{avg}(y),$ defined as the average energy deposition in a volume divided by the average chord length of the volume. Lineal energy, y, deviates from LET due to energy straggling, delta-ray escape or entry, and nuclear fragments produced in the detector volume. Using an integrated space radiation model (which includes the transport codes BRYNTRN and HZETRN, and the quantum nuclear interaction model QMSFRG) and the response distribution functions of the walled-TEPC, we compared model calculations with the walled- TEPC measurements from NASA missions in LEO in order to develop a method of accurate exposure predictions for the lunar and the Mars missions. Good agreement was found for $Q_{avg}(y)$ between the model and measured spectra from past NASA missions. The $Q_{avg}(y)$ values for the trapped or the solar protons over-estimate the $Q_{avg}(LET)$ values, and the quantities increase with shield thickness due to nuclear fragmentation. The $Q_{avg}(y)$ for the complete GCR spectra measured from flight TEPCs under-estimate the $Q_{avg}(LET).$ The values for the GCR decrease with the shield thickness. Our analysis for a proper interpretation of observed data supports the use of TEPCs for monitoring the space radiation environment.
Starting Page	2362
Ending Page	2367
File Size	307846
Page Count	6
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4436619
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Q factor Extraterrestrial measurements Low earth orbit satellites Q measurement Predictive models Space missions Protons Radiation monitoring Silicon on insulator technology NASA
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Comparison of integrated radiation transport models with tepc measurements for the average quality factors in spaceflights

Interpretation of tepc measurements in space flights for radiation monitoring

Heterogeneous Spacecraft Networks: Performance analysis for low-cost Earth Observation missions

Measurements of the radiation belts from Mir and STRV 1994-1997

Radiation Protection Research Recommendations for Missions Beyond LEO

Radiation monitoring in medium Earth orbit over the solar minimum period

Space Radiation Damage Measurements in the Earth Synchronous Orbit

Energetic Proton Maps for the South Atlantic Anomaly

Proton Flux Anisotropy in Low Earth Orbit

Comparison of integrated radiation transport models with TEPC measurements for the average quality factors in space flights

Similar Documents

Comparison of integrated radiation transport models with tepc measurements for the average quality factors in spaceflights

Interpretation of tepc measurements in space flights for radiation monitoring

Heterogeneous Spacecraft Networks: Performance analysis for low-cost Earth Observation missions

Measurements of the radiation belts from Mir and STRV 1994-1997

Radiation Protection Research Recommendations for Missions Beyond LEO

Radiation monitoring in medium Earth orbit over the solar minimum period

Space Radiation Damage Measurements in the Earth Synchronous Orbit

Energetic Proton Maps for the South Atlantic Anomaly

Proton Flux Anisotropy in Low Earth Orbit

Comparison of integrated radiation transport models with TEPC measurements for the average quality factors in space flights