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Title of article :
The photoionization-reduced energy in LSC
Author/Authors :
A. Grau Carles، نويسنده , , E. Günther، نويسنده , , A. Grau Malonda، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
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Abstract :
The atomic rearrangement cascade that follows the electron-capture decay process in low-Z radionuclides involves X-rays which have high photoelectric interaction probabilities. When the K-shell binding energy of the ionized atom (e.g., hydrogen) is significantly lower than the energy of the X-ray photon, the detector response to a photon-equivalent energy electron and the whole photoionization process are very similar. This is not the case when the scintillator cocktail contains larger atoms (e.g., oxygen and phosphorus in Ultima GoldTM). For larger Z atoms, the reduced energy of the whole photoionization process is less than the reduced energy of the interacting photon due to the nonlinear effects of ionization quenching. This paper shows the convenience of including a more detailed simulation of the photoionization process in the atomic rearrangement detection model for electron-capture nuclides such as 55Fe, 51Cr and 54Mn. The need for more elaborate atomic rearrangement models is a consequence of the analysis of 125I data.
Keywords :
Liquid scintillation counting , photoionization , Electron-capture
Journal title :
Applied Radiation and Isotopes
Serial Year :
Link To Document :