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Detector sensitivity to galena?

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Hello, I found what I believe is a (8.5+ g) piece of weathered galina with my VLF detector (GM 1000), but we noticed that a GPX 4500 couldn’t pick it up (11” mono coil).  The 4500 was working fine and could sense tiny bullet flakes during the test also. Curious if this is typical of other PI detectors. Does anyone have experience with something like this?

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