Initial gain estimation for gamma detector

A computer program product having a series of operating instructions stored on a non-transitory computer-readable medium that directs a data processing apparatus when executed thereby to perform operations to determine a gamma detector gain of a gamma detector inserted into a wellbore of a well site, the operations comprising:

• determining a high voltage range utilizing the gamma detector and subterranean formation information of the well site;
• sweeping through the high voltage range utilizing a high voltage step value to determine one or more high voltage data collection points, wherein the high voltage step value is determined by one or more of an approximate distribution of steps across the high voltage range, and a variable distribution of steps utilizing portions of the high voltage range;
• counting detected gamma events at each high voltage data collection point utilizing the gamma detector, wherein the counting is performed for a detecting time interval prior to adjusting the high voltage data collection point to a subsequent high voltage data collection point utilizing the high voltage step value;
• and
• estimating a high voltage knee value utilizing the count of detected gamma events.