Recently, a polycrystalline chemical vapor deposited (pCVD) 3D diamond detector with graphitic in bulk electrodes, fabricated using a pulsed laser technique has been evaluated for photon beam radiation dosimetry during in-air exposure. The same 3D diamond detector, has now been investigated to evaluate its performance under clinically relevant conditions putting the detector inside a Polymethylmethacrylate (PMMA) phantom, to obtain higher precision dosimetric measurements. The detector leakage current was of the order of +/- 25 pA or less for bias voltages up to -100 V. The 3D detector was tested for time stability and repeatability showing excellent performance with less than 0.6% signal variation. It also showed a linear response for low dose rates with a deviation from linearity of 2%. It was also possible to verify the detector response as a function of the depth in PMMA up to 18 cm.
Investigation of 3D diamond detector dosimetric characteristics / Kanxheri, K.*; Solestizi, L. Alunni; Biasini, M.; Caprai, M.; Dipilato, A.C.; Iacco, M.; Ionica, M.; Lagomarsino, S.; Menichelli, M.; Morozzi, A.; Passeri, D.; Sciortino, S.; Talamonti, C.; Zucchetti, C.; Servoli, L.. - In: JOURNAL OF INSTRUMENTATION. - ISSN 1748-0221. - ELETTRONICO. - 13:(2018), pp. P06006-P06006. [10.1088/1748-0221/13/06/P06006]
Investigation of 3D diamond detector dosimetric characteristics
Lagomarsino, S.;Sciortino, S.;Talamonti, C.;
2018
Abstract
Recently, a polycrystalline chemical vapor deposited (pCVD) 3D diamond detector with graphitic in bulk electrodes, fabricated using a pulsed laser technique has been evaluated for photon beam radiation dosimetry during in-air exposure. The same 3D diamond detector, has now been investigated to evaluate its performance under clinically relevant conditions putting the detector inside a Polymethylmethacrylate (PMMA) phantom, to obtain higher precision dosimetric measurements. The detector leakage current was of the order of +/- 25 pA or less for bias voltages up to -100 V. The 3D detector was tested for time stability and repeatability showing excellent performance with less than 0.6% signal variation. It also showed a linear response for low dose rates with a deviation from linearity of 2%. It was also possible to verify the detector response as a function of the depth in PMMA up to 18 cm.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.