Absorbed Dose in Ion Beams: Comparison of Ionisation and Fluence-based Measurements
| Autor: | Osinga, Julia-Maria, Brons, Stephan, Bartz, James A., Akselrod, Mark S., Jäkel, Oliver, Greilich, Steffen |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Radiation Protection Dosimetry 161 (2014), 387-392 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/rpd/ncu004 |
| Popis: | 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, 3*10^6 1/cm2) and carbon ions (270.55 MeV/u, 3*10^6 1/cm2). 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 ionization 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. Comment: 6 pages, 1 figure |
| Databáze: | arXiv |
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