Dose rate effects on the thermoluminescence kinetics properties of MWCVD diamond films

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Phone: þ52 66 225 92 156, Fax: þ52 66 221 26 649Dose rate effects on the thermoluminescence (TL) properties of undoped and 750 ppm nitrogen doped microwave chemical vapor deposition (MWCVD) diamond films were analyzed. The diamond samples were exposed to 2.4-20.67 Gy/min dose rates from a 60 Co source. The TL glow curve of undoped sample showed no apparent dose rate effects. The doped diamond film exhibited dose rate effects consisting in a 10-30% integrated TL increase as the dose rate increased. The TL response as a function of dose rates showed a nonlinear behavior for the doped sample contrary to the undoped diamond film. The dose rate effects were evaluated through the determination of the kinetics parameters by fitting of the TL glow curves. The results indicate that chemical vapor deposition (CVD) diamond may present some dose rate effects on the TL properties in a given dose range, implying that some care should be exercised in order to use CVD diamond films in radiation dose assessments.

Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dose rate effects on the performance of MWCVD diamond films as TL gamma radiation dosimeter

Cruz-Zaragoza

Gastélum

Meléndrez

et al. 2010

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“…[ 43 ] MWCVD diamond films exhibit a TL repeatability of 3% deviation during the read‐out of successive cycles. [ 44 ] . HPHT diamond presents a nonreproducible TL glow curve shape due to the presence of nitrogen defects.…”

Section: Resultsmentioning

confidence: 99%

Thermal Annealing Effect on the Thermoluminescence Properties of Commercial High‐Pressure High‐Temperature Diamond Powders

Calderón-Martínez

Gil-Tolano²,

Cruz-Zaragoza

et al. 2022

“…Several TL characteristics like sensitivity, dose dependence, fading, and the linearity dose response of diamond have been investigated . However, one of the most important variables in dosimetry is the dose rate effect that may change the TL response at same doses . The trapping and recombination processes can influence dose rate effects during ionization by irradiation.…”

Section: Introductionmentioning

confidence: 99%

X‐Ray Thermoluminescence Dosimetry Characterization of Commercially Available CVD Diamond

Gil-Tolano¹,

Meléndrez²,

Álvarez-García³

et al. 2018

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.