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| Home > Publications database > Direct determination ofkQfor Farmer-type ionization chambers in a clinical scanned carbon-ion beam using water calorimetry. |
| Home > Publications database > Direct determination ofkQfor Farmer-type ionization chambers in a clinical scanned carbon-ion beam using water calorimetry. |
| Journal Article | DKFZ-2022-00182 |
; ;
2022
IOP Publ.
Bristol
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Please use a persistent id in citations: doi:10.1088/1361-6560/ac4fa0
Abstract: Within two studies, kQ factors for two Farmer-type ionization chambers have been experimentally determined by means of water calorimetry in the entrance channel (EC) of a monoenergetic carbon-ion beam [1] and for a passively modulated spread-out Bragg peak (SOBP) [2]. Both studies were performed at the Heidelberg Ion Beam Therapy Center (HIT) using the PTB portable water calorimeter but applying different initial beam energies of 429 MeV/u for the EC and 278 MeV/u for the SOBP as well as different scanning patterns of the irradiated eld. Comparing their results revealed differences between the experimental kQ factors of up to 1.9% between the EC and the SOBP. To further investigate this unexpected difference, we performed additional kQ determinations for the EC of an 278 MeV/u monoenergetic carbon-ion beam and reevaluated the original data of Osinga-Blättermann et al. [1]. This new experimental data indicated no difference between the kQ factors for the EC and the SOBP and the reevaluation led to a substantial reduction of the originally published kQ factors for the EC of the 429 MeV/u beam [1]. Finally, no signicant difference between the data for the EC and the data for the SOBP can be found within the standard measurement uncertainty of experimental kQ factors of 0.8 %. The results presented here are intended to correct and replace the kQ data published by Osinga- Blättermann et al. [1] and in Osinga-Blättermann and Krauss [3].
Keyword(s): SOBP ; carbon-ion beams ; entrance channel ; kQ factors ; water calorimetry
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