For that, you need something like this gamma-ray spectroscope ... [mihai.cuciuc] took inspiration for the Pomelo from this DIY spectrometer as well as the CosmicPi.

We don’t know why [stoppi71] needs to do gamma spectroscopy. We only know that he has made one, including a high-voltage power supply, a photomultiplier tube, and–what else–an Arduino.

Novel radiation detectors and applications, Gamma ray spectrometry, Neutron and Gamma based techniques for Nuclear Safeguards and Radioactive Waste Assay, Neutron Activation Analysis, Monte Carlo ...

All depth measurements reported are down-hole and true thicknesses are yet to be determined.

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