TGR-IC is a combined logging tool of TCT-IC 100Kb/s Telemetry Sub and GRS-IC Natural Gamma Ray Logging Tool. The function of the TCT is to provide, in conjunction with a telemetry module, a standardized interface between the surface acquisition system and digital down logging tools.
The Natural Gamma Ray Logging Tool (GRS) measures of the total Gamma Ray in the formation. It is an independent tool, or combined with TCT-IC being TGR-IC.