Fast Neutron Dosimeter for the Space Environment

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$599,993.00
Award Year:
2011
Program:
SBIR
Phase:
Phase II
Contract:
NNX11CA24C
Award Id:
n/a
Agency Tracking Number:
094841
Solicitation Year:
2009
Solicitation Topic Code:
X14.01
Solicitation Number:
n/a
Small Business Information
MA, Watertown, MA, 02472-4699
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
073804411
Principal Investigator:
JamesChristian
Principal Investigator
(616) 668-6897
jchristian@rmdinc.com
Business Contact:
GeraldEntine
President
(617) 617-6800
gentine@rmdinc.com
Research Institute:
Stub




Abstract
Model calculations and risk assessment estimates indicate that secondary neutrons, with energies ranging between 0.5 to>150 MeV, make a significant contribution to the total absorbed dose received by space crews during long duration space missions [1-3]. Advanced scintillation materials, which exhibit radiation type and mass dependent emission times, coupled to SSPM detectors, provide the optimum volume to payload performance and the ability to easily discriminate between the fraction of dose, which results from secondary neutrons, and that which results from exposure to energetic charged particles and background gamma-rays.The Phase-1 effort successfully characterized the critical components of the proposed dosimeter, specifically, the response of the scintillation material to irradiation by gamma-rays, protons, and neutrons, as well as the performance of the SSPM detector. The Phase-1 modeling studies provide a critical foundation for assessing the anticipated signals in the space radiation environment. The proposed dosimeter would overcome many of the limitations in the current generation of neutron dosimeters, and would provide baseline information on the physics, needed with the information from biological studies, to assess risk in future human-space-exploration missions to the moon and Mars.

* information listed above is at the time of submission.

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