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Numbers of scintillation photons produced in NaI(Tl) and plastic scintillator by gamma-rays

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3 Author(s)
Miyajima, M. ; Nat. Lab. for High Energy Phys., Ibaraki, Japan ; Sasaki, S. ; Tawara, H.

The WS-value, which is defined as an average energy expended per scintillation photon, is determined to be 17.2±0.40 eV for a NaI(Tl) phosphor and 60.8±4.3 eV for a plastic scintillator (NE-102A). These are obtained from the numbers of photoelectrons measured with several combinations of a photomultiplier tube and a NaI(Tl) or a NE-102A scintillator. The number of photoelectrons, which are measured by the photomultiplier tube as a vacuum photodiode, are converted to the number of scintillation photons by using an averaged quantum efficiency of each photomultiplier photocathode and a calculated collection efficiency of the scintillation photons at the photocathode. The above values do not include the uncertainties due to the unknown exact emission spectra and the photomultiplier response curves

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Nuclear Science, IEEE Transactions on  (Volume:40 ,  Issue: 4 )