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

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=3×10(6) cm(-2)) and carbon ions (270.55 MeV u(-1), ϕ=3 × 10(6) cm(-2)). It was found that absorbed dose...

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Veröffentlicht in:Radiation protection dosimetry 2014-10, Vol.161 (1-4), p.387-392
Hauptverfasser: Osinga, Julia-Maria, Brons, Stephan, Bartz, James A, Akselrod, Mark S, Jäkel, Oliver, Greilich, Steffen
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Sprache:eng
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Zusammenfassung: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=3×10(6) cm(-2)) and carbon ions (270.55 MeV u(-1), ϕ=3 × 10(6) 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.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncu004