ZAHRADNIK, I.A.; BARBERET, P.; TROMSON, D.; MARZI, L.De; POMORSKI, M.T.

doi:10.1063/5.0002403

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ZAHRADNIK, I.A.
Laboratoire d'Intégration des Systèmes et des Technologies [LIST (CEA)]

BARBERET, P.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

TROMSON, D.
Laboratoire d'Intégration des Systèmes et des Technologies [LIST (CEA)]

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Rev.Sci.Instrum.. 2020, vol. 91, n° 5, p. 054102

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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.< Leer menos

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A diamond guard ring microdosimeter for ion beam therapy

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