In addition to its primary role as a lithological or clay indicator, a natural
gamma measurement is frequently used as the basis for establishing correlations
between boreholes and to ensure accurate depth matching between different
logging runs made in the same borehole. For these reasons, many LIM probes
provide this measurement as an additional log along with other parameters.
The GRT38 probe provides a solution for cases where only a basic, total counts
natural gamma log is required and also provides a borehole fluid temperature
measurement useful for correcting certain other logs.
Based on a ø25 x 50 mm NaI(Tl) scintillation crystal detector coupled to a
high-performance photomultiplier tube, the probe boasts excellent sensitivity
(±1.2 cps / API unit) and provides a high quality final result.
For clients requiring this additional parameter, the probe can be factory fitted
with a casing collar locator (CCL) detector.
Lim designs, produces and commercializes measuring instruments and solutions dedicated to drilling.