The peak you see at around 80 keV could be X-ray fluorescence from the lead in the shield. This line appears whenever we measure something inside a lead shield. The background gamma radiation also ionizes and excites the lead in the shield, which then emits fluorescence X-rays. Part of this radiation is also detected by the device.
@PedroGomes1974 Absolutely, That's how you can identify unknown metallic materials that become ionized as a result of a radioactive source that's behind a lead shield from the detector but not the sample
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The peak you see at around 80 keV could be X-ray fluorescence from the lead in the shield. This line appears whenever we measure something inside a lead shield. The background gamma radiation also ionizes and excites the lead in the shield, which then emits fluorescence X-rays. Part of this radiation is also detected by the device.
@PedroGomes1974 Absolutely, That's how you can identify unknown metallic materials that become ionized as a result of a radioactive source that's behind a lead shield from the detector but not the sample