Pulse shape analysis of individual gamma events—Correlation to energy resolution and the possibility of its improvement

The measurement in 2014 of the nonproportionality of each decay component in CsI:Tl found opposite slopes of the fast and tail nonproportionality curves above about 10 keV. Somewhat earlier experiments on nonproportionality and resolution versus shaping time in NaI:Tl and CsI:Tl showed that proporti...

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Bibliographic Details
Published in:Journal of applied physics 2018-10, Vol.124 (15)
Main Authors: Gridin, S., Onken, D. R., Williams, R. T., Swiderski, L., Mianowska, Z., Syntfeld-Kazuch, A., Moszynski, M., Gayshan, V., Vasiukov, S., Gektin, A.
Format: Article
Language:English
Subjects:
Applied physics
Correlation analysis
Decay rate
Energy resolution
Pulse amplitude
Pulse shape
Scintillation
Scintillation counters
Weight
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Summary:The measurement in 2014 of the nonproportionality of each decay component in CsI:Tl found opposite slopes of the fast and tail nonproportionality curves above about 10 keV. Somewhat earlier experiments on nonproportionality and resolution versus shaping time in NaI:Tl and CsI:Tl showed that proportionality and intrinsic resolution could be improved by including the slower “tail” component of the scintillation pulse. The observed opposing nonproportionality trends of fast and tail components constitute a basis for improvement of scintillator nonproportionality if they are added in a suitable linear combination. We examine whether combining the rise and decay components pulse by pulse with an algorithm of optimized proportions may also improve energy resolution. The premise is that a scintillation pulse carries more information about the particle stopping event than is conveyed in a simple measurement of the pulse height. In this work, we measured pulse shapes of individual gamma events in CsI:Tl and other scintillators using an eMorpho multichannel analyzer as a digital oscilloscope. Decomposition of every scintillation pulse into a rise and three exponential decay components allowed us to represent the pulse height spectrum as a linear combination of them. We found that energy resolution of CsI:Tl can be altered and improved through changing the weight of decay components in the linear combination.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5048034