Only talking... Maybe you can't put all this big apparatus into a handle pistol, so is not practical here. If you work in oil company, don't know why you don't know about this spontaneous potential occurs in Earth causes by ores and oxidized metals...
These are not the same as the isotope detectors used in oil well heads. The probes sent down an oil shaft are used to identify changes in the composition of the soil, in hopes of determining what kind of soil conditions and probablility of oil below. The gamma sensors built by the rocket scientists were designed to be used above ground. They are designed to be used for surveying a large area of land for minerals by using the detector on foot, in car, in airplane, or in a satellite. From foot distance or from satellite distance, the detector can pinpoint ore deposits up to 5000 feet deep below the surface. It has been used to locate petroleum deposits up to 10,000 feet deep.
The early isotope detectors of the 1970s were bulky, taking the space of 4-5 cubic feet. But in the 1980s a portable version was built that was the size of a laptop computer of 4 inches depth which ran on rechargeable nicad batteries. It had a sensor head 1-1/2 inch diameter x 10 inch long connected by a cable 6 feet long. Most of the space inside this 1980s detector was taken by discrete logic chips used to discriminate and for counting and driving displays. Only a small high voltage section for the photomultiplier.
If this same device was built today using modern display drivers, it could easily be built much smaller, maybe the size of a pistol detector, with the sensor head mounted inside.
Best wishes,
J_P

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