Comparative measurements on LaBr3(Ce) and LaCl3(Ce) scintillators coupled to PSPMT

Wonho Lee; David K. Wehe; Byoungjik Kim

Comparative measurements on LaBr₃(Ce) and LaCl₃(Ce) scintillators coupled to PSPMT

Wonho Lee, David K. Wehe, Byoungjik Kim

Research output: Contribution to journal › Conference article › peer-review

Abstract

We present the results of energy resolution measurements at 662 keV for a LaBr₃ crystal (3.67%) and a 6×6 array of LaCl₃ crystals (4.65%) coupled to a 5" diameter Hamamatsu PSPMT, and compare them to measurements on arrays of NaI (7.37%) and BGO (16.07%). The raw spectra obtained using the full PSPMT area were less impressive due to the well-known position-dependent sensitivity of the PSPMT. The raw energy resolution of the total area of LaCl₃ without collimation is poor (13%) but it is much improved by position dependent gain correction (5.85%).To avoid this complication, the spectra were acquired using a well-collimated source focused upon a small area of the detector. 2D flood-field radiation images from those scintillators were also obtained. The position distortion due to the light spreading in the scintillator and the non-uniformity of the PSPMT were corrected by several methods. Gaussian fitting was found to be superior to other methods but at the expense of increased processing time.

Original language	English
Pages (from-to)	861-864
Number of pages	4
Journal	IEEE Nuclear Science Symposium Conference Record
Volume	2
Publication status	Published - 2004
Externally published	Yes
Event	2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors - Rome, Italy Duration: 2004 Oct 16 → 2004 Oct 22

ASJC Scopus subject areas

Radiation
Nuclear and High Energy Physics
Radiology Nuclear Medicine and imaging

Cite this

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title = "Comparative measurements on LaBr3(Ce) and LaCl3(Ce) scintillators coupled to PSPMT",

abstract = "We present the results of energy resolution measurements at 662 keV for a LaBr3 crystal (3.67%) and a 6×6 array of LaCl3 crystals (4.65%) coupled to a 5{"} diameter Hamamatsu PSPMT, and compare them to measurements on arrays of NaI (7.37%) and BGO (16.07%). The raw spectra obtained using the full PSPMT area were less impressive due to the well-known position-dependent sensitivity of the PSPMT. The raw energy resolution of the total area of LaCl3 without collimation is poor (13%) but it is much improved by position dependent gain correction (5.85%).To avoid this complication, the spectra were acquired using a well-collimated source focused upon a small area of the detector. 2D flood-field radiation images from those scintillators were also obtained. The position distortion due to the light spreading in the scintillator and the non-uniformity of the PSPMT were corrected by several methods. Gaussian fitting was found to be superior to other methods but at the expense of increased processing time.",

author = "Wonho Lee and Wehe, {David K.} and Byoungjik Kim",

year = "2004",

language = "English",

volume = "2",

pages = "861--864",

journal = "IEEE Nuclear Science Symposium Conference Record",

issn = "1095-7863",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors ; Conference date: 16-10-2004 Through 22-10-2004",

}

TY - JOUR

T1 - Comparative measurements on LaBr3(Ce) and LaCl3(Ce) scintillators coupled to PSPMT

AU - Lee, Wonho

AU - Wehe, David K.

AU - Kim, Byoungjik

PY - 2004

Y1 - 2004

N2 - We present the results of energy resolution measurements at 662 keV for a LaBr3 crystal (3.67%) and a 6×6 array of LaCl3 crystals (4.65%) coupled to a 5" diameter Hamamatsu PSPMT, and compare them to measurements on arrays of NaI (7.37%) and BGO (16.07%). The raw spectra obtained using the full PSPMT area were less impressive due to the well-known position-dependent sensitivity of the PSPMT. The raw energy resolution of the total area of LaCl3 without collimation is poor (13%) but it is much improved by position dependent gain correction (5.85%).To avoid this complication, the spectra were acquired using a well-collimated source focused upon a small area of the detector. 2D flood-field radiation images from those scintillators were also obtained. The position distortion due to the light spreading in the scintillator and the non-uniformity of the PSPMT were corrected by several methods. Gaussian fitting was found to be superior to other methods but at the expense of increased processing time.

AB - We present the results of energy resolution measurements at 662 keV for a LaBr3 crystal (3.67%) and a 6×6 array of LaCl3 crystals (4.65%) coupled to a 5" diameter Hamamatsu PSPMT, and compare them to measurements on arrays of NaI (7.37%) and BGO (16.07%). The raw spectra obtained using the full PSPMT area were less impressive due to the well-known position-dependent sensitivity of the PSPMT. The raw energy resolution of the total area of LaCl3 without collimation is poor (13%) but it is much improved by position dependent gain correction (5.85%).To avoid this complication, the spectra were acquired using a well-collimated source focused upon a small area of the detector. 2D flood-field radiation images from those scintillators were also obtained. The position distortion due to the light spreading in the scintillator and the non-uniformity of the PSPMT were corrected by several methods. Gaussian fitting was found to be superior to other methods but at the expense of increased processing time.

UR - http://www.scopus.com/inward/record.url?scp=23844467443&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:23844467443

SN - 1095-7863

VL - 2

SP - 861

EP - 864

JO - IEEE Nuclear Science Symposium Conference Record

JF - IEEE Nuclear Science Symposium Conference Record

T2 - 2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors

Y2 - 16 October 2004 through 22 October 2004

ER -

Comparative measurements on LaBr₃(Ce) and LaCl₃(Ce) scintillators coupled to PSPMT

Abstract

ASJC Scopus subject areas

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