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Article Dans Une Revue Rev.Sci.Instrum. Année : 2020

A diamond guard ring microdosimeter for ion beam therapy

Résumé

A single crystal chemical vapor deposition diamond-based microdosimeter prototype featuring an array of micro-sensitive volumes (μSVs) and surrounded by a so-called guard ring (GR) electrode has been fabricated using various microfabrication techniques available at Diamond Sensors Laboratory of CEA, Saclay. The GR microdosimeter was irradiated by a raster scanning method with 2 MeV proton microbeams. The charge transport properties of the GR sensor were determined with sub-micron spatial resolution by measuring the charge collection efficiency (CCE), the μSV geometry, and the pulse-height spectra. The response of the microdosimeter showed a well-defined and homogeneously active μSV. Appropriate biasing of the μSV structures led toward a full CCE for protons with lineal energies of ∼46 keV/μm. This shows the GR microdosimeter’s great potential for applications in microdosimetry in clinical beam conditions.
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Dates et versions

hal-02863166 , version 1 (12-06-2020)

Identifiants

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I.A. Zahradnik, P. Barberet, D. Tromson, L.De Marzi, M.T. Pomorski. A diamond guard ring microdosimeter for ion beam therapy. Rev.Sci.Instrum., 2020, 91 (5), pp.054102. ⟨10.1063/5.0002403⟩. ⟨hal-02863166⟩
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