Journal ArticleDOI
Performance of 8 $\,\times\,$ 8 Pixel LaBr $_{3}$ :Ce and Gd $_{2}$ SiO $_{5}$ :Ce Scintillator Arrays Coupled to a 64-Channel Multi-Anode PMT
Shunsuke Kurosawa,Hidetoshi Kubo,Kaori Hattori,C. Ida,Satoru Iwaki,Shigeto Kabuki,Kentaro Miuchi,H. Nishimura,Y. Okada,Joseph D. Parker,Atsushi Takada,Michiaki Takahashi,Toru Tanimori,Kazuki Ueno,Y. Yanagida +14 more
TLDR
A LaBr3:Ce scintillator array consisting of 8 × 8 pixels, which serves as an absorber of scattered gamma rays with energies from 0.1 to 1 MeV in a Compton camera, and a Gd2SiO5: Ce (GSO:Ci) scintilla array, which is coupled to a 64-channel multi-anode PMT and measured with a single anode photomultiplier tube.Abstract:
We have developed a LaBr3:Ce scintillator array consisting of 8 × 8 pixels with a size of 5.8 mm×5.8 mm×15.0 mm, which serves as an absorber of scattered gamma rays with energies from 0.1 to 1 MeV in a Compton camera. The pixels were cut from two pieces of LaBr3:Ce crystal with a diameter of 38 mm and a length of 38 mm with full width at half-maximum (FWHM) energy resolutions of 4.1 ± 0.1% and 3.0 ± 0.1% at 356 and 662 keV, respectively, measured with a single anode photomultiplier tube (PMT). The crystal had the following volumetric uniformities: light outputs with a difference of 0.5% (standard deviation: SD) and energy resolutions with that of 2% (SD) at 356 keV. In contrast, for each pixel in the array, the average and SD FWHM energy resolutions over 64 pixels, measured with a single-anode PMT and a collimator, were 5.8 ± 0.9% at 356 keV. The array was then coupled to a 64-channel multi-anode PMT (Hamamatsu H8500), the anode pitch of which was the same as the LaBr3:Ce pixel pitch of 6.1 mm. When the 64 anodes were read out from four channels in a resistor chain by the charge division method, the FWHM energy resolution of all 64 pixels was 7.0 ± 0.5% at 662 keV, whereas that of the inner 6×6 pixels was 5.8 ± 0.4% at 662 keV. In addition, we measured a Gd2SiO5:Ce (GSO:Ce) scintillator array consisting of 8×8 pixels with a size of 5.9 mm×5.9 mm×13.0 mm to compare its performance with that of the LaBr3:Ce array. The FWHM energy resolution of all 64 GSO:Ce pixels was 10.8 ± 0.3% at 662 keV. With these energy resolutions, FWHM angular resolutions of the Compton camera using the LaBr3:Ce and GSO:Ce arrays are expected to be 4.6° and 5.3°, respectively, at 662 keV.read more
Citations
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Journal ArticleDOI
Observation of Diffuse Cosmic and Atmospheric Gamma Rays at Balloon Altitudes with an Electron-tracking Compton Camera
Atsushi Takada,Hidetoshi Kubo,Hironobu Nishimura,K. Ueno,Kaori Hattori,Shigeto Kabuki,Shunsuke Kurosawa,Kentaro Miuchi,Eiichi Mizuta,Tsutomu Nagayoshi,Naoki Nonaka,Yoko Okada,Reiko Orito,Hiroyuki Sekiya,Atsushi Takeda,Toru Tanimori +15 more
TL;DR: In this article, the SMILE-I detector was used to detect diffuse cosmic and atmospheric gamma rays at balloon altitudes with the Sub-MeV gamma-ray Imaging Loaded-on-Balloon Experiment I (SMILE) as the first step toward a future all-sky survey with a high sensitivity.
Journal ArticleDOI
Observation of diffuse cosmic and atmospheric gamma rays at balloon altitudes with an electron-tracking compton camera
Atsushi Takada,Hidetoshi Kubo,Hironobu Nishimura,K. Ueno,Kaori Hattori,Shigeto Kabuki,Shunsuke Kurosawa,Kentaro Miuchi,Eiichi Mizuta,Tsutomu Nagayoshi,Naoki Nonaka,Yoko Okada,Reiko Orito,Hiroyuki Sekiya,Atsushi Takeda,Toru Tanimori +15 more
TL;DR: In this article, the SMILE-I detector was used to detect diffuse cosmic and atmospheric gamma rays at balloon altitudes with the Sub-MeV gamma-ray Imaging Loaded-on-Balloon Experiment I (SMILE) as the first step toward a future all-sky survey with a high sensitivity.
Journal ArticleDOI
Performance of Ce-doped (La, Gd)2Si2O7 scintillator with an avalanche photodiode
TL;DR: In this paper, the scintillation properties of a Ce-doped (La, Gd) 2 Si 2 O 7 (Ce:La-GPS) crystal were measured with Si avalanche photodiode (APD, Hamamatsu S8664-55).
Journal ArticleDOI
3D Compton image reconstruction method for whole gamma imaging
Hideaki Tashima,Eiji Yoshida,Hidekatsu Wakizaka,Miwako Takahashi,Kotaro Nagatsu,Atsushi B. Tsuji,Kei Kamada,Katia Parodi,Taiga Yamaya +8 more
TL;DR: An image reconstruction method based on a list-mode ordered subset expectation maximization algorithm incorporating detector response function (DRF) modeling, random correction and normalization for either PET and Compton imaging is developed, supporting a future expectation that Compton imaging outperforms PET.
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TL;DR: The Gelfant 4 toolkit as discussed by the authors is a toolkit for simulating the passage of particles through matter, including a complete range of functionality including tracking, geometry, physics models and hits.
Journal ArticleDOI
GEM: A new concept for electron amplification in gas detectors
TL;DR: The gas electrons multiplier (GEM) as discussed by the authors is a composite grid consisting of two metal layers separated by a thin insulator, etched with a regular matrix of open channels, inserted in a gas detector on the path of drifting electrons.
Journal ArticleDOI
Über die Streuung von Strahlung durch freie Elektronen nach der neuen relativistischen Quantendynamik von Dirac
Oskar Klein,Y. Nishina +1 more
TL;DR: In this article, the Intensitat der Compton Streustrahlung is investigated, in which Lichtquants zu der Ruheenergie des Elektrons sind.
Journal ArticleDOI
ISGRI: The INTEGRAL soft gamma-ray imager
Francois Lebrun,J. P. Leray,P. Lavocat,J Crétolle,M. Arques,C. Blondel,C. Bonnin,A. Bouère,C. Cara,T. Chaleil,F. Daly,F. Desages,H. Dzitko,B. Horeau,Philippe Laurent,Olivier Limousin,F. Mathy,V. Mauguen,F. Meignier,F. Molinie,E. Poindron,M. Rouger,A. Sauvageon,T. Tourrette +23 more
TL;DR: In this article, a CdTe gamma-ray camera is operating in space for the first time in the history of high energy astronomy, and it shows no signs of degradation after 9 months in orbit.
Journal ArticleDOI
ISGRI: the INTEGRAL Soft Gamma-Ray Imager
Francois Lebrun,J. P. Leray,P. Lavocat,J Crétolle,M. Arques,C. Blondel,C. Bonnin,Andre Bouere,Christophe Cara,T. Chaleil,F. Daly,F. Desages,H. Dzitko,B. Horeau,Philippe Laurent,Olivier Limousin,F. Mathy,V. Mauguen,F. Meignier,F. Molinie,E. Poindron,M. Rouger,A. Sauvageon,T. Tourette +23 more
TL;DR: In this paper, the in-flight behavior and performance of a CdTe gamma-ray camera on board the IntEGRAL satellite is described. But the performance of the camera is not analyzed.
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