X-Ray Thermoluminescence Dosimetry Characterization of Commercially Available CVD Diamond

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Abstract

High quality commercially available CVD diamonds are being tested in novel clinical high energy photons, hadron therapy, and high energy physics applications. In the present work, the authors report on the thermoluminescence (TL) and dosimetry properties of commercial synthetic CVD diamond sample from Element6, exposed to X-ray irradiation at dose rates of 3.9–120 Gy min−1 from 0.13 to 90 Gy. The TL glow curves are composed of four peaks with maxima at about 104, 150, 210, and 280 °C and activation energies of 0.78, 0.79, 0.81, and 1.0 eV, respectively. The dose response of the area under TL glow curves is linear at doses lower than 0.6 Gy, supralinear between 0.6 and 6 Gy and sublinear at higher doses. The samples exhibited a strong TL fading of the low temperature 104 °C peaks that fades away around 120 min after irradiation, which is accompanied by increasing of the 210 and 280 °C peaks. The measured TL cycle reproducibility was very good, in spite of the fading exhibited by the lower temperature peak, with values of 0.1–3.0% at different dose rates and doses. It is concluded that CVD commercially single crystal electronic grade diamond may be securely used in clinical radiotherapy.

Original languageEnglish
Article number1800246
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume215
Issue number22
DOIs
StatePublished - 21 Nov 2018

Bibliographical note

Funding Information:
We acknowledge the partial financial supports from CONACYT, Proyecto No. 0222610 Apoyado por el Fondo Sectorial de Investigacion para la Educación.

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • diamond CVD crystal
  • dosimetry
  • fading
  • thermoluminescence
  • X-ray irradiation

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