Calibration of plane parallel ionization chambers: a new service for secondary standard dosimetry laboratories?
Identifieur interne : 000A35 ( Istex/Corpus ); précédent : 000A34; suivant : 000A36Calibration of plane parallel ionization chambers: a new service for secondary standard dosimetry laboratories?
Auteurs : M. Arib ; H. Chekerker ; S. Benmokhtar ; A. MeghzifeneSource :
- Medical Dosimetry [ 0958-3947 ] ; 2001.
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- KwdEn :
Abstract
This paper presents the results of calibration of PTW Markus and NACP ionization chambers following the procedures outlined in the TRS 381 International Atomic Energy Agency code of practice. According to this dosimetry protocol, calibration of plane parallel chambers follows 2 methods. The first method uses a high-energy electron beam and consists of comparing the plane parallel chamber with a cylindrical chamber whose ND,air calibration factor, traceable to cobalt-60 (60Co), is known, while the second method applies to a 60Co gamma beam whose air kerma rate is known at the calibration point. As the second method is generally applied in Secondary Standard Dosimetry Laboratories, the consistency of calibrations free in-air and in a water phantom has been studied. A close agreement is shown between the 2 methods (the calibration factors differ by at most 0.98%). These results lead to the conclusion that either of the 2 calibration methods can be used, provided that the correction factors given by the TRS 381 code of practice are applied.
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DOI: 10.1016/S0958-3947(01)00077-2
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According to this dosimetry protocol, calibration of plane parallel chambers follows 2 methods. The first method uses a high-energy electron beam and consists of comparing the plane parallel chamber with a cylindrical chamber whose ND,air calibration factor, traceable to cobalt-60 (60Co), is known, while the second method applies to a 60Co gamma beam whose air kerma rate is known at the calibration point. As the second method is generally applied in Secondary Standard Dosimetry Laboratories, the consistency of calibrations free in-air and in a water phantom has been studied. A close agreement is shown between the 2 methods (the calibration factors differ by at most 0.98%). 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Chekerker, who assisted in the experimental work, and who died at the end of this work.</note><note type="content">Fig. 1: Phantom used for the in-water calibrations of the pp ionization chambers.</note><note type="content">Fig. 2: Device used for the accurate positioning of the pp chambers in the phantom.</note><note type="content">Fig. 3: Geometry used for the calibration of pp ionization chambers free-in-air.</note><note type="content">Fig. 4: Geometry used for the calibration of pp ionization chambers in a water phantom.</note><note type="content">Table 1: Calibration factors of the pp ionization chambers as determined by the free-in-air and the in-water calibration methods</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Calibration of plane parallel ionization chambers: a new service for secondary standard dosimetry laboratories?</title><author xml:id="author-1"><persName><forename type="first">M</forename><surname>Arib</surname></persName><email>amehenna@altavista.fr</email><note type="biography">Reprint requests to: M. 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According to this dosimetry protocol, calibration of plane parallel chambers follows 2 methods. The first method uses a high-energy electron beam and consists of comparing the plane parallel chamber with a cylindrical chamber whose ND,air calibration factor, traceable to cobalt-60 (60Co), is known, while the second method applies to a 60Co gamma beam whose air kerma rate is known at the calibration point. As the second method is generally applied in Secondary Standard Dosimetry Laboratories, the consistency of calibrations free in-air and in a water phantom has been studied. A close agreement is shown between the 2 methods (the calibration factors differ by at most 0.98%). 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Chekerker, who assisted in the experimental work, and who died at the end of this work.</ce:note-para></ce:footnote></ce:title><ce:author-group><ce:author><ce:given-name>M</ce:given-name><ce:surname>Arib</ce:surname><ce:cross-ref refid="COR1"><ce:sup>*</ce:sup></ce:cross-ref><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref><ce:e-address type="email">amehenna@altavista.fr</ce:e-address></ce:author><ce:author><ce:given-name>H</ce:given-name><ce:surname>Chekerker</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>S</ce:given-name><ce:surname>Benmokhtar</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>A</ce:given-name><ce:surname>Meghzifene</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>a</ce:label><ce:textfn>Laboratoire Secondaire des Etalons en Dosimétrie Centre de Radioprotection et de Sûreté, Alger Gare Alger, Algeria</ce:textfn></ce:affiliation><ce:correspondence id="COR1"><ce:label>*</ce:label><ce:text>Reprint requests to: M. Arib, Laboratoire Secondaire d’Etalons en Dosimétrie, Centre de Recherche Nucléaire d’Alger, 2 Bd. Frantz Fanon B.P. 399, Alger Gare, Alger 16000 – Algeria</ce:text></ce:correspondence></ce:author-group><ce:date-received day="10" month="7" year="2000"></ce:date-received><ce:date-accepted day="4" month="4" year="2001"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>This paper presents the results of calibration of PTW Markus and NACP ionization chambers following the procedures outlined in the TRS 381 International Atomic Energy Agency code of practice. According to this dosimetry protocol, calibration of plane parallel chambers follows 2 methods. The first method uses a high-energy electron beam and consists of comparing the plane parallel chamber with a cylindrical chamber whose N<ce:inf>D,air</ce:inf> calibration factor, traceable to cobalt-60 (<ce:sup>60</ce:sup>Co), is known, while the second method applies to a <ce:sup>60</ce:sup>Co gamma beam whose air kerma rate is known at the calibration point. As the second method is generally applied in Secondary Standard Dosimetry Laboratories, the consistency of calibrations free in-air and in a water phantom has been studied. A close agreement is shown between the 2 methods (the calibration factors differ by at most 0.98%). 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Arib, Laboratoire Secondaire d’Etalons en Dosimétrie, Centre de Recherche Nucléaire d’Alger, 2 Bd. 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According to this dosimetry protocol, calibration of plane parallel chambers follows 2 methods. The first method uses a high-energy electron beam and consists of comparing the plane parallel chamber with a cylindrical chamber whose ND,air calibration factor, traceable to cobalt-60 (60Co), is known, while the second method applies to a 60Co gamma beam whose air kerma rate is known at the calibration point. As the second method is generally applied in Secondary Standard Dosimetry Laboratories, the consistency of calibrations free in-air and in a water phantom has been studied. A close agreement is shown between the 2 methods (the calibration factors differ by at most 0.98%). These results lead to the conclusion that either of the 2 calibration methods can be used, provided that the correction factors given by the TRS 381 code of practice are applied.</abstract><note type="footnote">This paper is dedicated to the memory of Mr. H. Chekerker, who assisted in the experimental work, and who died at the end of this work.</note><note type="content">Fig. 1: Phantom used for the in-water calibrations of the pp ionization chambers.</note><note type="content">Fig. 2: Device used for the accurate positioning of the pp chambers in the phantom.</note><note type="content">Fig. 3: Geometry used for the calibration of pp ionization chambers free-in-air.</note><note type="content">Fig. 4: Geometry used for the calibration of pp ionization chambers in a water phantom.</note><note type="content">Table 1: Calibration factors of the pp ionization chambers as determined by the free-in-air and the in-water calibration methods</note><subject lang="en"><genre>Keywords</genre><topic>Plane parallel chambers</topic><topic>Calibration</topic><topic>SSDL</topic><topic>Absorbed dose</topic><topic>Air kerma</topic></subject><relatedItem type="host"><titleInfo><title>Medical Dosimetry</title></titleInfo><titleInfo type="abbreviated"><title>MDO</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">200124</dateIssued></originInfo><identifier type="ISSN">0958-3947</identifier><identifier type="PII">S0958-3947(00)X0028-3</identifier><part><date>200124</date><detail type="volume"><number>26</number><caption>vol.</caption></detail><detail type="issue"><number>4</number><caption>no.</caption></detail><extent unit="issue pages"><start>301</start><end>342</end></extent><extent unit="pages"><start>301</start><end>304</end></extent></part></relatedItem><identifier type="istex">41CC1799663B5B50312B95A549D81928152F80D1</identifier><identifier type="DOI">10.1016/S0958-3947(01)00077-2</identifier><identifier type="PII">S0958-3947(01)00077-2</identifier><accessCondition type="use and reproduction" contentType="copyright">©2001 American Association of Medical Dosimetrists</accessCondition><recordInfo><recordContentSource>ELSEVIER</recordContentSource><recordOrigin>American Association of Medical Dosimetrists, ©2001</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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