In this paper the response in term of pulse height linearity of two Hamamatsu photomultipliers is investigated, when coupled to a LaBr3:Ce scintillation crystal. The two photodetectors have high quantum efficiency and in particular 30% for R6231-01 and 42% for R7600-200 tube. The substantial difference is in the dynode structure, linear focused and metal channel for R6231 and R7600 respectively. In this work in order to verify the non-linearity effects on the pulse height distribution, due principally to the high and fast light production of LaBr3:Ce scintillator, we propose a ‘peak by peak’ procedure to calibrate the pulse height distribution. Utilizing a specific fragmentation of the calibration curve in subsets, the calculated energy values are very similar for both PMTs. This result confirmed the potentiality of the procedure to highlight the non-linearity effects on pulse height distribution.

Pulse height non-linearity in LaBr3:Ce crystal for gamma ray spectrometry and imaging

NAVARRIA, FRANCESCO LUIGI;LANCONELLI, NICO;
2011

Abstract

In this paper the response in term of pulse height linearity of two Hamamatsu photomultipliers is investigated, when coupled to a LaBr3:Ce scintillation crystal. The two photodetectors have high quantum efficiency and in particular 30% for R6231-01 and 42% for R7600-200 tube. The substantial difference is in the dynode structure, linear focused and metal channel for R6231 and R7600 respectively. In this work in order to verify the non-linearity effects on the pulse height distribution, due principally to the high and fast light production of LaBr3:Ce scintillator, we propose a ‘peak by peak’ procedure to calibrate the pulse height distribution. Utilizing a specific fragmentation of the calibration curve in subsets, the calculated energy values are very similar for both PMTs. This result confirmed the potentiality of the procedure to highlight the non-linearity effects on pulse height distribution.
R. Pani; M.N. Cinti; R. Pellegrini; P. Bennati; S. Ridolfi; R. Scafè; V. Orsolini Cencelli; F. De Notaristefani; A. Fabbri; F.L. Navarria; N. Lanconelli; G. Moschini; P. Boccaccio
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/103940
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