Journal Article

Absorbed dose in ion beams: comparison of ionisation- and fluence-based measurements

Julia-Maria Osinga, Stephan Brons, James A. Bartz, Mark S. Akselrod, Oliver Jäkel and Steffen Greilich

in Radiation Protection Dosimetry

Volume 161, issue 1-4, pages 387-392
Published in print October 2014 | ISSN: 0144-8420
Published online February 2014 | e-ISSN: 1742-3406 | DOI: https://dx.doi.org/10.1093/rpd/ncu004
Absorbed dose in ion beams: comparison of ionisation- and fluence-based measurements

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A direct comparison measurement of fluorescent nuclear track detectors (FNTDs) and a thimble ionisation chamber is presented. Irradiations were performed using monoenergetic protons (142.66 MeV, ϕ=3×106 cm−2) and carbon ions (270.55 MeV u−1, ϕ=3×106 cm−2). It was found that absorbed dose to water values as determined by fluence measurements using FNTDs are, in case of protons, in good agreement (2.4 %) with ionisation chamber measurements, if slower protons and Helium secondaries were accounted for by an effective stopping power. For carbon, however, a significant discrepancy of 4.5 % was seen, which could not be explained by fragmentation, uncertainties or experimental design. The results rather suggest a W-value of 32.10 eV±2.6 %. Additionally, the abundance of secondary protons expected from Monte-Carlo transport simulation was not observed.

Journal Article.  2722 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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