Comparison of D^sub w^ measurements by alanine and synthetic diamond dosimeters in photon beams with 1 cm × 1 cm field size

For photon beam sizes lower than 2 cm x 2 cm no absorbed-dose-to-water (D...) primary standards are available for determining the possible influence of field size on the dosimeter response. In this work, D... measurements performed in 1 cm x 1 cm photon beams at PTB using alanine and synthetic diamo...

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Bibliographic Details
Published inMetrologia Vol. 49; no. 5; p. S211
Main Authors Pimpinella, M, Anton, M, Rouijaa, M, Stravato, A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.10.2012
Subjects
Atoms & subatomic particles
Cancer therapies
Comparative analysis
Measurement
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Summary:For photon beam sizes lower than 2 cm x 2 cm no absorbed-dose-to-water (D...) primary standards are available for determining the possible influence of field size on the dosimeter response. In this work, D... measurements performed in 1 cm x 1 cm photon beams at PTB using alanine and synthetic diamond dosimeters were compared in order to assess the reliability of the two dosimetric systems in such a small field size. The ratio of D... values measured by diamond dosimeters to D... values measured by alanine was 0.991 ± 1.5% (1 SD) and 1.007 ± 1.3% (1 SD) for 6 MV and 10 MV photon beams, respectively. This shows that both systems are capable of accurately measuring D... in small fields. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0026-1394
1681-7575