Why in Phoswich detectors the scintillators are usually chosen to have different decay times?
Added by Gabriel S.
Step 1
Step 1: Understand the structure of a Phoswich detector, which consists of two or more scintillators optically coupled to a single photodetector. Show more…
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(a) Two annihilation $\gamma$ rays in a PET scan originate at the same point and travel to detectors on either side of the patient. If the point of origin is 9.00 $\mathrm{cm}$ closer to one of the detectors, what is the difference in arrival times of the photons? (This could be used to give position information, but the time difference is small enough to make it difficult.) (b) How accurately would you need to be able to measure arrival time differences to get a position resolution of 1.00 $\mathrm{mm} ?$
Explain why fluorescence emission is always at a longer wavelength than fluorescence excitation. Why is phosphorescence emission always at a longer wavelength than fluorescence emission? Why is the excited state lifetime much longer for phosphorescence processes (up to 100 seconds) compared to typical fluorescence processes (typically ns to mns)?
David C.
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