IMAGING NEUTRON ACTIVATION ANALYSIS

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$49,780.00
Award Year:
1990
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
11755
Agency Tracking Number:
11755
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
301 Chesapeake Drive, Redwood City, CA, 94063
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Ronald H Fleming
Senior Scientist
() -
Business Contact:
() -
Research Institute:
n/a
Abstract
WE PROPOSE TO CONSTRUCT AND TEST AN IMAGING NEUTRON ACTIVATION ANALYSIS DETECTOR CAPABLE OF DISCERNING ELEMENT CONCENTRATIONS ON A POINT-BY-POINT BASIS. NEUTRON ACTIVATION ANALYSIS IS AN EXTREMELY POWERFUL METHOD FOR MEASURING MAJOR, MINOR, AND TRACE ELEMENT CONCENTRATIONS IN A WIDE VARIETY OF SAMPLES. IN THIS METHOD, ANALYTE ELEMENTSABSORB A NEUTRON TO FORM A RADIONUCLIDE WHICH USUALLY DECAYS BY EMITTING A BETA-PARTICLE AND A GAMMA-RAY. THE GAMMA-RAY ENERGIES ARE CHARACTERISTIC OF THE ANALYTE ELEMENTAND THEY ARE NORMALLY MEASURED WITH A GERMANIUM DETECTOR. SECONDARY ELECTRONS PRODUCED AT A SAMPLE SURFACE AS A BETA-PARTICLE PASSES OUT OF A THIN SAMPLE CAN BE ACCELERATEDAND IMAGED. WHEN GAMMA-RAYS AND BETA-PARTICLES ARE DETECTEDIN COINCIDENCE, THE GAMMA-RAY ENERGY ANSWERS THE QUESTION "WHAT" AND THE SECONDARY ELECTRON POSITION ANSWERS THE QUESTION "WHERE" FOR AN INDIVIDUAL RADIONUCLIDE DISINTEGRATION. THIS INFORMATION WILL BE ORGANIZED INTO ELEMENT MAPS AND LOCAL AREA GAMMA-RAY SPECTRA. IMAGING NEUTRON ACTIVATION ANALYSIS WILL BE USEFUL FOR ANALYSIS OF HETEROGENEOUS SOLIDS. WE ANTICIPATE WIDESPREAD APPLICATIONSIN FIELDS SUCH AS GEOLOGY, BIOLOGY, MATERIALS SCIENCE, AND PARTICLE ANALYSIS.

* information listed above is at the time of submission.

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