A TUNABLE, MONOCHROMATIC X-RAY GENERATOR FOR EXPLOSIVES DETECTION

Award Information
Agency: Department of Transportation
Branch: N/A
Contract: N/A
Agency Tracking Number: 26944
Amount: $99,995.00
Phase: Phase I
Program: SBIR
Awards Year: 1994
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
2181 Park Blvd, Palo Alto, CA, 94306
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr Melvin A Piestrup
 President
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
PARAMETRIC X-RADIATION (PXR) IS PROPOSED AS AN INTENSE, TUNABLE, MONOCHROMATIC HARD-X-RAY SOURCE FOR THE DETECTION OF EXPLOSIVES. THIS RADIATION IS HIGHLY COLLIMATED, HAS A BANDWIDTH OF 0.1, AND AN INTENSITY EQUAL TO THAT OF SYNCHROTRON RADIATION ON A PER ELECTRON BASIS. PXR GENERATION IS ACHIEVED BY PLACING CRYSTALS INTO THE PATH OF ELECTRON BEAMS WITH ENERGY OF 6 MEV OR GREATER. THE VIRTUAL PHOTONS ASSOCIATED WITH THE FIELDS OF THE ELECTRONS ARE BRAGG REFLECTED BY THE CRYSTAL LATTICE AND REAL X-RAYS APPEAR AT THE BRAGG ANGLE. THE PRODUCTION IS THUS ANALOGOUS TO X-RAY DIFFRACTION EXCEPT THAT THE X-RAY BEAM INCIDENT AT THE BRAGG ANGLE IS REPLACED BY A RELATIVISTIC ELECTRON BEAM. PREVIOUS RESEARCH BY US AND OTHERS HAVE DEMONSTRATED THAT X-RAYS WITH ENERGIES OF E < 15 KEV CAN BE PRODUCED. HOWEVER, THEORETICAL ANALYSES SHOW THAT HARDER X-RAYS (E > 50 KEV) CAN BE PRODUCED WITH GOOD EFFICIENCY. DURING THE PHASE I RESEARCH WE WILL DESIGN RADIATORS FOR 50 KEV EMISSION, CALCULATE THEIR THEORETICAL X-RAY FLUX, AND MEASURE EXPERIMENTALLY THEIR HARD-R-RAY SPECTRUM USING PULSE HEIGHT ANALYSIS.

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

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