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Title: Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams

Abstract

Purpose: To determine the potentialities of synthetic single crystal diamond Schottky diodes for accurate dose measurements in radiation therapy small photon beams. Methods: The dosimetric properties of a diamond-based detector were assessed by comparison with a reference microionization chamber. The diamond device was operated at zero bias voltage under irradiation with high-energy radiotherapic photon beams. The stability of the detector response and its dose and dose rate dependence were measured. Different square field sizes ranging from 1 Multiplication-Sign 1 cm{sup 2} to 10 Multiplication-Sign 10 cm{sup 2} were used during comparative dose distribution measurements by means of percentage depth dose curves (PDDs), lateral beam profiles, and output factors. The angular and temperature dependence of the diamond detector response were also studied. Results: The detector response shows a deviation from linearity of less than {+-}0.5% in the 0.01-7 Gy range and dose rate dependence below {+-}0.5% in the 1-6 Gy/min range. PDDs and output factors are in good agreement with those measured by the reference ionization chamber within 1%. No angular dependence is observed by rotating the detector along its axis, while {approx}3.5% maximum difference is measured by varying the radiation incidence angle in the polar direction. The temperature dependence wasmore » investigated as well and a {+-}0.2% variation of the detector response is found in the 18-40 Degree-Sign C range. Conclusions: The obtained results indicate the investigated synthetic diamond-based detector as a candidate for small field clinical radiation dosimetry in advanced radiation therapy techniques.« less

Authors:
; ; ; ; ; ; ; ;  [1]
  1. INFN-Dipartimento di Ingegneria Industriale, Universita di Roma 'Tor Vergata',Via del Politecnico 1, I-00133 Roma (Italy)
Publication Date:
OSTI Identifier:
22100649
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 39; Journal Issue: 7; Other Information: (c) 2012 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 60 APPLIED LIFE SCIENCES; BEAM PROFILES; DEPTH DOSE DISTRIBUTIONS; DIAMONDS; DOSE RATES; DOSIMETRY; GY RANGE 01-10; INCIDENCE ANGLE; IONIZATION CHAMBERS; IRRADIATION; MONOCRYSTALS; PHOTON BEAMS; RADIATION DOSES; RADIOTHERAPY; SCHOTTKY BARRIER DIODES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Ciancaglioni, I., Marinelli, Marco, Milani, E., Prestopino, G., Verona, C., Verona-Rinati, G., Consorti, R., Petrucci, A., De Notaristefani, F., U.O. Fisica Sanitaria, Ospedale San Filippo Neri, Via G. Martinotti 20, 00135 Roma, and INFN-Dipartimento di Fisica, Universita Roma 3, Via della Vasca Navale 84, 00146 Roma. Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams. United States: N. p., 2012. Web. doi:10.1118/1.4729739.
Ciancaglioni, I., Marinelli, Marco, Milani, E., Prestopino, G., Verona, C., Verona-Rinati, G., Consorti, R., Petrucci, A., De Notaristefani, F., U.O. Fisica Sanitaria, Ospedale San Filippo Neri, Via G. Martinotti 20, 00135 Roma, & INFN-Dipartimento di Fisica, Universita Roma 3, Via della Vasca Navale 84, 00146 Roma. Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams. United States. https://doi.org/10.1118/1.4729739
Ciancaglioni, I., Marinelli, Marco, Milani, E., Prestopino, G., Verona, C., Verona-Rinati, G., Consorti, R., Petrucci, A., De Notaristefani, F., U.O. Fisica Sanitaria, Ospedale San Filippo Neri, Via G. Martinotti 20, 00135 Roma, and INFN-Dipartimento di Fisica, Universita Roma 3, Via della Vasca Navale 84, 00146 Roma. 2012. "Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams". United States. https://doi.org/10.1118/1.4729739.
@article{osti_22100649,
title = {Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams},
author = {Ciancaglioni, I. and Marinelli, Marco and Milani, E. and Prestopino, G. and Verona, C. and Verona-Rinati, G. and Consorti, R. and Petrucci, A. and De Notaristefani, F. and U.O. Fisica Sanitaria, Ospedale San Filippo Neri, Via G. Martinotti 20, 00135 Roma and INFN-Dipartimento di Fisica, Universita Roma 3, Via della Vasca Navale 84, 00146 Roma},
abstractNote = {Purpose: To determine the potentialities of synthetic single crystal diamond Schottky diodes for accurate dose measurements in radiation therapy small photon beams. Methods: The dosimetric properties of a diamond-based detector were assessed by comparison with a reference microionization chamber. The diamond device was operated at zero bias voltage under irradiation with high-energy radiotherapic photon beams. The stability of the detector response and its dose and dose rate dependence were measured. Different square field sizes ranging from 1 Multiplication-Sign 1 cm{sup 2} to 10 Multiplication-Sign 10 cm{sup 2} were used during comparative dose distribution measurements by means of percentage depth dose curves (PDDs), lateral beam profiles, and output factors. The angular and temperature dependence of the diamond detector response were also studied. Results: The detector response shows a deviation from linearity of less than {+-}0.5% in the 0.01-7 Gy range and dose rate dependence below {+-}0.5% in the 1-6 Gy/min range. PDDs and output factors are in good agreement with those measured by the reference ionization chamber within 1%. No angular dependence is observed by rotating the detector along its axis, while {approx}3.5% maximum difference is measured by varying the radiation incidence angle in the polar direction. The temperature dependence was investigated as well and a {+-}0.2% variation of the detector response is found in the 18-40 Degree-Sign C range. Conclusions: The obtained results indicate the investigated synthetic diamond-based detector as a candidate for small field clinical radiation dosimetry in advanced radiation therapy techniques.},
doi = {10.1118/1.4729739},
url = {https://www.osti.gov/biblio/22100649}, journal = {Medical Physics},
issn = {0094-2405},
number = 7,
volume = 39,
place = {United States},
year = {Sun Jul 15 00:00:00 EDT 2012},
month = {Sun Jul 15 00:00:00 EDT 2012}
}