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Improved Stability of Mercuric Iodide Detectors for Anticoincidence Shields

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX11CE78P
Agency Tracking Number: 105951
Amount: $99,984.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: S1.05
Solicitation Number: N/A
Timeline
Solicitation Year: 2010
Award Year: 2011
Award Start Date (Proposal Award Date): 2011-02-18
Award End Date (Contract End Date): 2011-09-29
Small Business Information
19355 Business Center Drive, Suite 10
Northridge, CA -
United States
DUNS: 153098871
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Neal Hartsough
 Principal Investigator
 (818) 280-0177
 neal.hartsough@dxray.com
Business Contact
 Peter Lee
Title: Business Official
Phone: (818) 280-0177
Email: peter.lee@dxray.com
Research Institution
 Stub
Abstract

We propose to utilize guard ring electrode structures and a new film growth technique to create improved polycrystalline mercuric iodide detectors for background suppression by active anticoincidence shielding in gamma-ray spectrometers. Two proposed NASA missions will require anticoincidence shielding for x-ray and gamma-ray spectrometers: the High Energy Telescope of the EXIST (Energetic X-ray Imaging Survey Telescope) mission, and the Space Science Vision Mission expected to visit Titan, one of Saturn's moons. Shielding improves the performance of x-ray and gamma-ray spectrometers by reducing the effect of charged particle interactions which cannot be distinguished from true x-ray and gamma-ray interactions by the spectrometer. Active shields produce a blanking signal when a charged particle is detected, so that the signal from the spectrometer can be ignored during the spectrometer's charged-particle interaction. While it is well know that this technique produces significant improvement in x-ray and gamma-ray spectrometer performance, the technology to implement it is lacking. The attributes of mercuric iodide make it an excellent candidate for anticoincidence shielding detectors. Because of its detection characteristics, light weight, small size, low cost, robustness, and ease of application to non-planar geometries, this material can replace the costly, heavy, and bulky scintillator/photomultiplier tube (PMT) systems currently in use.

* Information listed above is at the time of submission. *

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