Low-cost Individual Digital Dosimeters using Solid State Photomultipliers

Award Information
Agency: Department of Defense
Branch: Defense Threat Reduction Agency
Contract: HDTRA1-07-C-0045
Agency Tracking Number: T051-007-0068
Amount: $749,999.00
Phase: Phase II
Program: SBIR
Awards Year: 2006
Solicitation Year: 2005
Solicitation Topic Code: DTRA05-007
Solicitation Number: 2005.1
Small Business Information
RADIATION MONITORING DEVICES, INC.
44 Hunt Street, Watertown, MA, 02472
DUNS: 073804411
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 James Christian
 Group Leader
 (617) 668-6801
 jchristian@rmdinc.com
Business Contact
 Gerald Entine
Title: President
Phone: (617) 668-6801
Email: gentine@rmdinc.com
Research Institution
N/A
Abstract
U.S. forces working in low-level radiation environments have unsatisfactory choices for monitoring radiation exposure. A solid-state photomultiplier (SSPM) uses an array of silicon based avalanche photodiodes (APD) to collect light and produce a signal proportional to the amount of light collected. The ability to produce arrays of APD’s in a CMOS (Complimentary Metal Oxide Semiconductor) environment makes possible the production of miniaturized arrays integrated with the dosimeter electronics in a small silicon chip – the dosimeter on a chip. This technology represents a novel approach for collecting the signal produced from radiation incident on a scintillating material. Additionally, the small size of the integrated system allows large cost reduction after production scale-up. In Phase I, we demonstrated that a scintillating crystal coupled to an SSPM provides a basis for a low-cost, energy responsive, digital dosimeter that is sensitive to low radiation fields. We also demonstrated that Individual pixels operated at 10-15% above breakdown voltage are insensitive to temperature changes that can disable currently used dosimeters.

* information listed above is at the time of submission.

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