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- W2604314201 abstract "Abstract The factors causing the distortion of the 128I s− spectrum detected by a self-activated CsI(Tl) scintillator were studied to verify the correctness of the spectral shape and the appropriateness of the discrimination setting for s−-particle counting by the scintillator. These criteria are essential for the correct evaluation of radioactivity generated in a scintillator volume by the self-activation method, which was recently proposed by our group. A pulse height defect caused by the partial escape of s− particles from the surface of the scintillator crystal shifts the s− spectrum toward the lower-energy region when smaller CsI(Tl) scintillators are used (the s−-escape effect). For larger CsI(Tl) scintillators, an increase in pulse height caused by the summing of 0.443 MeV prompt γ -rays from the excited state of the 128I daughter nuclide (128Xe) affects the shape of the s− spectrum considerably, resulting in a shift toward the higher-energy region (the γ -summing effect). The extent of the contributions of these two effects was examined by a Monte Carlo simulation of various cubical CsI(Tl) crystals of different sizes. It was found that the distortions caused by those two effects effectively cancel each other out for a medium-size cubical CsI(Tl) crystal with a side length of approximately 3 cm. This finding is very useful for the practical applications of the self-activation method. In addition to the factors mentioned above, the efficiency of scintillation light collection by the photodetectors also affects the shape distortion of the s− spectrum slightly through spectral line broadening due to the degradation of the energy resolution. This effect was estimated using a simple model with different discrimination settings for s− pulse counting." @default.
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- W2604314201 date "2017-11-01" @default.
- W2604314201 modified "2023-09-28" @default.
- W2604314201 title "Shape distortion of 128 I ß − spectrum observed by a self-activated CsI(Tl) scintillator for high-sensitivity neutron measurements" @default.
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- W2604314201 doi "https://doi.org/10.1016/j.nima.2017.04.013" @default.
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