Evaluation of a 3D diamond detector for medical radiation dosimetry

Year: 2017

Authors: Kanxheri K., Servoli L., Oh A., Munoz Sanchez F., Forcolin G.T., Murphy S.A., Aitkenhead A., Moore C.J., Morozzi A., Passeri D., Bellini M., Corsi C., Lagomarsino S., Sciortino S.

Autors Affiliation: INFN — Sezione di Perugia, Via A. Pascoli 33, Perugia 06123, Italy; INFN — Sezione di Firenze, Via G. Sansone 1, Firenze 50019, Italy; Dipartimento di Fisica, Università degli studi di Perugia, Via Pascoli 33, Perugia 06123, Italy; Dipartimento di Ingegneria, Università degli studi di Perugia, Via G. Duranti 93, Perugia 06131, Italy; Dipartimento di Fisica, Università degli studi di Firenze, Via G. Sansone 1, Firenze 50019, Italy; Physics Department, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.; The Christie NHS Foundation Trust, Wilmslow Road, Manchester M20 4BX, U.K.; Manchester Academic Health Science Centre, Grafton Street, Manchester M13 9NT, U.K.; INO-CNR di Firenze, Largo Enrico Fermi 6, Firenze 50125, Italy; LENS Firenze Via Carrara 1, Firenze 50019, Italy

Abstract: Synthetic diamond has several properties that are particularly suited to applications in medical radiation dosimetry. It is tissue equivalent, not toxic and shows a high resistance to radiation damage, low leakage current and stability of response. It is an electrical insulator, robust and realizable in small size; due to these features there are several examples of diamond devices, mainly planar single-crystalline chemical vapor depositation (sCVD) diamond, used for relative dose measurement in photon beams. Thanks to a new emerging technology, diamond devices with 3-dimensional structures are produced by using laser pulses to create graphitic paths in the diamond bulk. The necessary bias voltage to operate such detector decreases considerably while the signal response and radiation resistance increase. In order to evaluate the suitability of this new technology for measuring the dose delivered by radiotherapy beams in oncology a 3D polycrystalline (pCVD) diamond detector designed for single charged particle detection has been tested and the photon beam profile has been studied. The good linearity and high sensitivity to the dose observed in the 3D diamond, opens the way to the possibility of realizing a finely segmented device with the potential for dose distribution measurement in a single exposure for small field dosimetry that nowadays is still extremely challenging.


Volume: 12      Pages from: P01003-1  to: P01003-14

More Information: This work has been partially supported by “Fondazione Cassa di Risparmio Perugia – Progetto 3Dose 2016.0107.021”.
KeyWords: Dosimetry concepts and apparatus; Leakage currents; Particle beams; Photoelectrons; Photons; Radiation damage; Synthetic diamonds, 3-dimensional structures; Charged particle detection; Diamond detectors; Dose-distribution measurement; Electrical insulators; Emerging technologies; Low-leakage current; Radiation resistance, Dosimetry
DOI: 10.1088/1748-0221/12/01/P01003

Citations: 7
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