The NGT-B Gamma-ray tool is used to make depth corrections to logs by identifying the location of naturally radioactive rock formations behind casing that can be correlated with open-hole logs.
It uses a super-sensitive hermetically-sealed scintillator crystal and photomultiplier for maximum log quality.
Mechanical design techniques derived from MWD tools ensure a rugged and reliable tool.
The Titanium housing not only provides maximum protection in sour-gas environments, but minimizes attenuation of gamma-rays due to the low density.
The electronics are fully temperature compensated to maintain constant count-rates at all rated temperatures.
The NGT-B is available with the CBG Digital Telemetry, or as a Pulse output tool.
The graph below shows the vertical resolution of the gamma ray tool.