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Scintillation Counter

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... state by emitting light (usually in blue wavelength) ... Blue light is detected by photomultiplier tube (usually two PMT are used to minimize PMT errors. ... – PowerPoint PPT presentation

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Title: Scintillation Counter


1
Scintillation Counter
  • Scintillation Cocktail contains solvent and fluor
    (or solute) molecules.
  • Solvent is good at capturing energy of ?-particle
    (electron), but often does not produce light.
  • A fluor molecule enters an excited state
    following interaction with excited solvent.
  • The excited fluor molecule decays to ground state
    by emitting light (usually in blue wavelength)
  • Blue light is detected by photomultiplier tube
    (usually two PMT are used to minimize PMT errors.

2
?-Energy and Light Intensity
Stronger ? emitters generate stronger pulses of
light, so that 3H , 14C, and 32P can all be
distinguished and counted at the same time.
3
Quenching
Effects of Quenching
4
Beckmans H
Compton electrons
H-Number
The larger the H number the greater the quenching
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