A TUNABLE, MONOCHROMATIC X-RAY GENERATOR FOR EXPLOSIVES DETECTION

Award Information
Agency:
Department of Transportation
Branch
n/a
Amount:
$99,995.00
Award Year:
1994
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
26944
Agency Tracking Number:
26944
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
2181 Park Blvd, Palo Alto, CA, 94306
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Melvin A Piestrup
President
() -
Business Contact:
() -
Research Institute:
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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