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Intrinsic efficiency
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The intrinsic efficiency relates the counts in the spectrum to the number of gamma ray photons incident on the detector.

Intrinsic efficiency is defined as:

Intrinsic efficiency = Absolute efficiency (4p/W)

where W is the solid angle of the detector seen from the actual source position.


Have a go! Move the source (sphere) closer to the detector by dragging it down using the mouse.

[ Intrinsic efficiency applet here ]


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