LOGGING

Award Information
Agency:
Department of Energy
Branch:
N/A
Amount:
$50,000.00
Award Year:
1983
Program:
SBIR
Phase:
Phase I
Contract:
N/A
Agency Tracking Number:
377
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Radiation Monitoring Devices
44 Hunt Street, Watertown, MA, 02172
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
N/A
Principal Investigator
 GERALD ENTINE PH.D.
 PRESIDENT
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
NUCLEAR TECHNIQUES ARE POWERFUL TOOLS FOR OIL WELL LOGGING BUT ARE LIMITED IN MANY WAYS BY THE HIGH AMBIANT TEMPERATURES THE DETECTORS MUST WITHSTAND. PRESENT SENSORS REQUIRE EITHER CRYOGENIC COOLING OR THE USE OF BULKY PHOTOTUBES WHICH ARE NOT COMPATIBLE WITH MODERN MINIATURIZEDLOGGING INSTRUMENTATION. THE MOST COMMONLY USED ROOM TEMPERATURE SOLID STATE NUCLEAR SENSOR, CDTE, HAS CLEARLY DEMONSTRATED THE REDUCTIONS IN INSTRUMENT SIZE AND COMPLEXITY POSSIBLE WHEN THE NEED FOR COOLING IS ELIMINATED.CDTE HOWEVER, IS LIMITED TO TEMPERATURES ONLY SLIGHTLY ABOVE ROOM TEMPERATURE. AN ALTERNATIVE SEMICONDUCTOR FOR NUCLEAR SENSORS IS ZNTE, WHICH IS CHEMICALLY AND ELECTRICALLY VERY SIMILAR TO CDTE. HOWEVER, ITS WIDER BANDGAP WILL ALLOW A ZNTE DETECTOR TO OPERATE AT THE HIGHER TEMPERATURES ENCOUNTERED IN DOWNHOLE LOGGING. A PROGRAM IS PROPOSED TO MAKE ZNTE DEVICES USING THE SAME GROWTH AND FABRICATION PROCEDURES WHICH HAVE BEEN SO SUCCESSFUL FOR CDTE. PHASE I OF THIS PROGRAM WILL INVESTIGATE THE PHYSICAL, MATERIAL AND ELECTRICAL PROPERTIES OF ZNTE GROWN BY THE TRAVELLING HEATER METHOD AND WILL DETERMINE THE STEPS NEEDED TO BRING ABOUT THE FULL POTENTIAL OF THE ZNTE DEVICES WHICH WILL OPERATE NEAR 200 DEGREES C. ACTUAL ZNTE GAMMA RAY SENSORS WILL BE MADE TO DEMONSTRATE THE BASIC FEASIBILITY OF THIS APPROACH.

* information listed above is at the time of submission.

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