Lecture19 - ENU 4612C/5615C Nuclear Radiation Detection and...

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ENU 4612C/5615C Nuclear Radiation Detection and Instrumentation Lecture 19 Inorganic Scintillators
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Incident quantum interacts in scintillator, deposits all or part of its kinetic energy. Electrons and charged particles interact directly, neutrons and gamma-rays indirectly. Characterized by “Detection Efficiency” Step 1 in Scintillation Detection of Radiation β γ e Photodetector (PM tube or photodiode) scintillator
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Excited species in scintillator (created by deposited energy) emit UV or visible light as they de-excite to lower energy state. These “scintillation photons” are emitted in all directions. Characterized by “Scintillation Efficiency” Step 2 in Scintillation Detection of Radiation step) slowest the is (Generally seconds 10 to 10 scale Time 6 - 9 -
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Scintillation photons are reflected and scattered until they are absorbed or escape from the scintillator. Absorption can be either at surface or in the bulk of the scintillator. Characterized by “Light Collection Efficiency” Step 3 in Scintillation Detection of Radiation photon absorbed photon escapes directly photon escapes after reflection(s)
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Scintillation photons reaching photodetector may be converted into electrical charges. In photomultiplier tube, charges are electrons emitted from the photocathode. In photodiode, charges are electron-hole pairs formed in diode semiconductor volume. Characterized by “Quantum Efficiency”
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This note was uploaded on 12/10/2011 for the course ENU 4612c taught by Professor Ghita during the Fall '11 term at University of Florida.

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Lecture19 - ENU 4612C/5615C Nuclear Radiation Detection and...

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