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Investigation on gamma-ray position sensitivity at 662 keV in a spectroscopic 3” x 3” LaBr3:Ce scintillator.

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Title: Investigation on gamma-ray position sensitivity at 662 keV in a spectroscopic 3” x 3” LaBr3:Ce scintillator.
Authors: Giaz, A.1 agnese.giaz@mi.infn.it, Camera, F.1,2, Birocchi, F.1,2, Blasi, N.1, Boiano, C.1, Brambilla, S.1, Coelli, S.1, Fiorini, C.1,3, Marone, A.3, Million, B.1, Riboldi, S.1,2, Wieland, O.1
Source: Nuclear Instruments & Methods in Physics Research Section A. Feb2015, Vol. 772, p103-111. 9p.
Subjects: Gamma ray sources, Doppler broadening, Sensitivity analysis, Scintillators, Lanthanum compounds, Imaging systems, Spectrum analysis
Abstract: The position sensitivity of a thick, cylindrical and continuous 3” x 3” (7.62 cm x 7.62 cm) LaBr 3 :Ce crystal was studied using a 1 mm collimated beam of 662 keV gamma rays from a 400 MBq intense 137 Cs source and a spectroscopic photomultiplier (PMT) (HAMAMATSU R6233-100SEL). The PMT entrance window was covered by black absorber except for a small window 1 cm x 1 cm wide. A complete scan of the detector over a 0.5 cm step grid was performed for three positions of the 1 cm x 1 cm window. For each configuration the energy spectrum was measured and the peak centroid, the FWHM, the area and peak asymmetry of the 662 keV gamma transition were analyzed. The data show that, even in a 3” thick LaBr 3 :Ce crystal with diffusive surfaces the position of the full energy peak centroid depends on the source position. We verified that, on average, the position of the full energy peak centroids measured in the three 1 cm x 1 cm window configurations is sufficient for the correct identification of the collimated gamma source position. [ABSTRACT FROM AUTHOR]
Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 100080733
AccessLevel: 6
PubType: Academic Journal
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  Data: Investigation on gamma-ray position sensitivity at 662 keV in a spectroscopic 3” x 3” LaBr3:Ce scintillator.
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Instruments+%26+Methods+in+Physics+Research+Section+A%22">Nuclear Instruments & Methods in Physics Research Section A</searchLink>. Feb2015, Vol. 772, p103-111. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Gamma+ray+sources%22">Gamma ray sources</searchLink><br /><searchLink fieldCode="DE" term="%22Doppler+broadening%22">Doppler broadening</searchLink><br /><searchLink fieldCode="DE" term="%22Sensitivity+analysis%22">Sensitivity analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Scintillators%22">Scintillators</searchLink><br /><searchLink fieldCode="DE" term="%22Lanthanum+compounds%22">Lanthanum compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Imaging+systems%22">Imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink>
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  Data: The position sensitivity of a thick, cylindrical and continuous 3” x 3” (7.62 cm x 7.62 cm) LaBr 3 :Ce crystal was studied using a 1 mm collimated beam of 662 keV gamma rays from a 400 MBq intense 137 Cs source and a spectroscopic photomultiplier (PMT) (HAMAMATSU R6233-100SEL). The PMT entrance window was covered by black absorber except for a small window 1 cm x 1 cm wide. A complete scan of the detector over a 0.5 cm step grid was performed for three positions of the 1 cm x 1 cm window. For each configuration the energy spectrum was measured and the peak centroid, the FWHM, the area and peak asymmetry of the 662 keV gamma transition were analyzed. The data show that, even in a 3” thick LaBr 3 :Ce crystal with diffusive surfaces the position of the full energy peak centroid depends on the source position. We verified that, on average, the position of the full energy peak centroids measured in the three 1 cm x 1 cm window configurations is sufficient for the correct identification of the collimated gamma source position. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.nima.2014.10.062
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        Text: English
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      – SubjectFull: Gamma ray sources
        Type: general
      – SubjectFull: Doppler broadening
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      – SubjectFull: Sensitivity analysis
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      – SubjectFull: Scintillators
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      – SubjectFull: Lanthanum compounds
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      – SubjectFull: Imaging systems
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      – SubjectFull: Spectrum analysis
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