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Medical Physics
Article . 2022 . Peer-reviewed
License: CC BY
Data sources: Crossref
Medical Physics
Article . 2022
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The probe-format graphite calorimeter, Aerrow, for absolute dosimetry in ultrahigh pulse dose rate electron beams.

Authors: Bourgouin, Alexandra; Keszti, Federico; Schönfeld, Andreas A.; Hackel, Thomas; Kozelka, Jakub; Hildreth, Jeff; Simon, William; +3 Authors

The probe-format graphite calorimeter, Aerrow, for absolute dosimetry in ultrahigh pulse dose rate electron beams.

Abstract

AbstractPurposeThe purpose of this investigation is to evaluate the use of a probe‐format graphite calorimeter, Aerrow, as an absolute and relative dosimeter of high‐energy pulse dose rate (UHPDR) electron beams for in‐water reference and depth–dose‐type measurements, respectively.MethodsIn this paper, the calorimeter system is used to investigate the potential influence of dose per pulses delivered up to 5.6 Gy, the number of pulses delivered per measurement, and its potential for relative measurement (depth–dose curve measurement). The calorimeter system is directly compared against an Advanced Markus ion chamber. The finite element method was used to calculate heat transfer corrections along the percentage depth dose of a 20‐MeV electron beam. Monte Carlo–calculated dose conversion factors necessary to calculate absorbed dose‐to‐water at a point from the measured dose‐to‐graphite are also presented.ResultsThe comparison of Aerrow against a fully calibrated Advanced Markus chamber, corrected for the saturation effect, has shown consistent results in terms of dose‐to‐water determination. The measured reference depth is within 0.5 mm from the expected value from Monte Carlo simulation. The relative standard uncertainty estimated for Aerrow was 1.06%, which is larger compared to alanine dosimetry (McEwen et al. https://doi.org/10.1088/0026‐1394/52/2/272) but has the advantage of being a real‐time detector.ConclusionIn this investigation, it was demonstrated that the Aerrow probe–type graphite calorimeter can be used for relative and absolute dosimetries in water in an UHPDR electron beam. To the author's knowledge, this is the first reported use of an absorbed dose calorimeter for an in‐water percentage depth–dose curve measurement. The use of the Aerrow in quasi‐adiabatic mode has greatly simplified the signal readout, compared to isothermal mode, as the resistance was directly measured with a high‐stability digital multimeter.

Country
Canada
Keywords

electron beam, Alanine, dosimetry, Water, Electrons, FLASH, Calorimetry, ultralight dose per pulse, calorimeter, Graphite, Radiometry, Monte Carlo Method

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    5
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Top 10%
Average
Average
Green
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