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 diferent logging runs made in the same borehole. For these
reasons, many Electromind 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 ø 25 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 fnal result.
For clients requiring this additional parameter, the probe can be factory
ftted with a casing collar locator (CC)) detector.
Optionally, the probe can be provided with a calibration certifcate
allowing the raw counts per second results to be converted to industry-
standard API units.
LIM is a leader company specialised in instrumentations during and after drilling