
4. Energy resolution
4.1 Scintillator + photomultiplier
Let n Φ photons of luminescence emitted by the scintillator,
n K photoelectrons emitted by the photomultiplier photocathode,
n A electrons collected on the photomultiplier anode.
It is assumed that fluctuations in n
Φ
(for the same energy loss in the scintillator) are poissonian, as are fluctuations in n
K
, hence :
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