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Scintillation Counter

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.

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Scintillation Counter

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  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. Beckman’s H# Compton electrons H-Number The larger the H number the greater the quenching

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