Transcript Borehole Radiometrics

Past, Present and Future
John R. Stowell & James J. LoCoco
Mount Sopris Instrument Company
Total
Gamma
GM-Tubes
Scintillation
NaI,CsI,BGO
Spectral
Gamma
Scintillation
MultiChannel
Analyzers
G-M Tubes
Schematic Diagram of Geiger-Muller Tube
downhole probes historically used at
Athabasca U3O8 sites.
Portable logging unit in operation at uranium mine site
Basic Total Count Gamma Tool
SP & Resistance Electrode
High Voltage Power Supply & Pulse Conditioning Circuitry
Photo-multiplier Tube & Scintillition Crystal
Combinable with other measurements,
deviation, resistivity, induction, etc…..
Analog Pulse Tool
Analog Gamma Pulses
Real-time monitoring of analog
gamma pulse tool
Modern Multi-Detector Digital Tools
Multi-Channel Spectral Gamma
Uranium Calibration Model
Uranium CPS vs. Grade
U cps vs. Grade
3
2.636
2.5
y = -6E-09x3 + 7E-06x2 + 0.003x - 0.020
ore grade %u308
2
1.5
1.229
1
0.5
0.4516
0.231
0
0
0
100
200
300
-0.5
cps in U channel
400
500
600
Model CPS vs. Polynomial Fit Grade
Grand Junction N5 Multi-Layer Model
Field Results-Modern Systems
Future of Uranium Logging ??
Mount Sopris, Colorado USA