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Empirical study of the spatial variation of recombination, polarity and polarization effects in ionization chambers.

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Title: Empirical study of the spatial variation of recombination, polarity and polarization effects in ionization chambers.
Authors: Butler, Duncan J.1 Duncan.Butler@arpansa.gov.au, Beveridge, Toby1, Lehmann, Joerg2,3,4, Oliver, Chris P.1, Bailey, Tracy E.1, Stevenson, Andrew W.5,6, Livingstone, Jayde5
Source: Nuclear Instruments & Methods in Physics Research Section A. Jan2019, Vol. 914, p15-24. 10p.
Subjects: Polarization (Nuclear physics), Ionization chambers, Electric fields, Synchrotron radiation, High resolution imaging
Abstract: Abstract We present measurements of the spatial response of two ionization chambers obtained by scanning them through a 0.1 mm diameter beam of synchrotron radiation (weighted-average energy 95 keV). The technique was used to investigate the spatial variation of effects associated with recombination, bias voltage and beam polarization on the signal. The chamber types investigated were the PTW model 30013 0.6 cm3 Farmer-type chamber and the Exradin model A5 100 cm3 spherical chamber. Recombination was found to vary according to the local electric field strength inside the chamber and the volume of air presented to the beam. The bias polarity effect was found to be small and relatively uniform across the chamber. Within the accuracy of the measurements, no difference could be determined between response scans with the electric field vector of the incident beam aligned parallel and orthogonal to the chamber axis. [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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 133189408
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Empirical study of the spatial variation of recombination, polarity and polarization effects in ionization chambers.
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  Data: <searchLink fieldCode="AR" term="%22Butler%2C+Duncan+J%2E%22">Butler, Duncan J.</searchLink><relatesTo>1</relatesTo><i> Duncan.Butler@arpansa.gov.au</i><br /><searchLink fieldCode="AR" term="%22Beveridge%2C+Toby%22">Beveridge, Toby</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lehmann%2C+Joerg%22">Lehmann, Joerg</searchLink><relatesTo>2,3,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Oliver%2C+Chris+P%2E%22">Oliver, Chris P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bailey%2C+Tracy+E%2E%22">Bailey, Tracy E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Stevenson%2C+Andrew+W%2E%22">Stevenson, Andrew W.</searchLink><relatesTo>5,6</relatesTo><br /><searchLink fieldCode="AR" term="%22Livingstone%2C+Jayde%22">Livingstone, Jayde</searchLink><relatesTo>5</relatesTo>
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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>. Jan2019, Vol. 914, p15-24. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Polarization+%28Nuclear+physics%29%22">Polarization (Nuclear physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Ionization+chambers%22">Ionization chambers</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+fields%22">Electric fields</searchLink><br /><searchLink fieldCode="DE" term="%22Synchrotron+radiation%22">Synchrotron radiation</searchLink><br /><searchLink fieldCode="DE" term="%22High+resolution+imaging%22">High resolution imaging</searchLink>
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  Data: Abstract We present measurements of the spatial response of two ionization chambers obtained by scanning them through a 0.1 mm diameter beam of synchrotron radiation (weighted-average energy 95 keV). The technique was used to investigate the spatial variation of effects associated with recombination, bias voltage and beam polarization on the signal. The chamber types investigated were the PTW model 30013 0.6 cm3 Farmer-type chamber and the Exradin model A5 100 cm3 spherical chamber. Recombination was found to vary according to the local electric field strength inside the chamber and the volume of air presented to the beam. The bias polarity effect was found to be small and relatively uniform across the chamber. Within the accuracy of the measurements, no difference could be determined between response scans with the electric field vector of the incident beam aligned parallel and orthogonal to the chamber axis. [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.2018.10.095
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      – Code: eng
        Text: English
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        PageCount: 10
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      – SubjectFull: Polarization (Nuclear physics)
        Type: general
      – SubjectFull: Ionization chambers
        Type: general
      – SubjectFull: Electric fields
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      – SubjectFull: Synchrotron radiation
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      – SubjectFull: High resolution imaging
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              Text: Jan2019
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