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BUT

Irradiation produces

luminiscence

Light is guided through optical fiber

to a photomultiplier

The signal is proportional to

absorbed dose

When we irradiate optical

fiber Cerenkov light is

produced

Cerenkov light depends on the

length of fiber irradiated, not

proportional to dose

Cerenkov light and luminiscence

have different wave lenghts

Spectral

discrimination

method

Organic scintillator

(W1 Standard Imaging)