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Development and application of a water calorimeter for the absolute dosimetry of short-range particle beams.

Renaud, J*; Rossomme, S*; Sarfehnia, A*; Vynckier, S*; Palmans, H; Kacperek, A*; Seuntjens, J* (2016) Development and application of a water calorimeter for the absolute dosimetry of short-range particle beams. Phys. Med. Biol., 61 (18). pp. 6602-6619.

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Abstract

In this work, we describe a new design of water calorimeter built to measure absorbed dose in non-standard radiation fields with reference depths in the range of 6-20 mm, and its initial testing in clinical electron and proton beams. A functioning calorimeter prototype with a total water equivalent thickness of less than 30 mm was constructed in-house and used to obtain measurements in clinical accelerator-based 6 MeV and 8 MeV electron beams and cyclotron based 60 MeV monoenergetic and modulated proton beams. Corrections for the conductive heat transfer due to dose gradients and non-water materials was also accounted for using a commercial finite element method software package. Absorbed dose to water was measured with an associated type A standard uncertainty of approximately 0.4% and 0.2% for the electron and proton beam experiments, respectively. In terms of thermal stability, drifts were on the order of a couple of hundred µK min-1, with a short-term variation of 5-10 µK. Heat transfer correction factors ranged between 1.021 and 1.049. The overall combined standard uncertainty on the absorbed dose to water was estimated to be 0.6% for the 6 MeV and 8 MeV electron beams, as well as for the 60 MeV monoenergetic protons, and 0.7% for the modulated 60 MeV proton beam. This study establishes the feasibility of developing an absorbed

Item Type: Article
Subjects: Ionising Radiation
Ionising Radiation > Dosimetry
Identification number/DOI: 10.1088/0031-9155/61/18/6602
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7526

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