Constancy checks of HDR well-type ionization chambers in the linac era: Potential use of a 90Sr source

A methodology using a90Sr source, originally designed for constancy checks of parallel-plate ionization chambers, was proposed for constancy checks of HDR brachytherapy well-type ionization chamber (WTIC). The 90Sr source was positioned on the top of the WTIC, a reference reading value was establish...

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Bibliographic Details
Published inApplied radiation and isotopes Vol. 165; p. 109309
Main Authors Borguezan Neto, Euclydes, Lima, Fabrício Augusto de, Lopes Branco, Isabela Soares, Barbi, Gustavo Lázaro, Colello Bruno, Alexandre, Viani Arruda, Gustavo, Pavoni, Juliana Fernandes
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2020
Subjects
90Sr source
Brachytherapy
Constancy check
Quality assurance
Well-type ionization chamber
Quality assurance
Brachytherapy
90Sr source
Constancy check
Well-type ionization chamber
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Summary:A methodology using a90Sr source, originally designed for constancy checks of parallel-plate ionization chambers, was proposed for constancy checks of HDR brachytherapy well-type ionization chamber (WTIC). The 90Sr source was positioned on the top of the WTIC, a reference reading value was established, and the constancy variation was calculated by the difference between each subsequent measurement and the reference value. This methodology was validated by calibrated 192Ir sources measurements and an acceptable tolerance limit for constancy variation of 1.5% was suggested.
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ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2020.109309