Polycrystalline chemically vapor deposited (CVD) diamond films have been proposed as detectors and dosimeters of ionizing radiation with prospective applications in high-energy photon dosimetry applications. We present a comparison study on the thermoluminescence (TL) properties of two diamond film samples grown by the hot filament CVD method having thickness of 180 and 500 μm and exposed to γ radiation in the 1-300 Gy dose range. The 180 μm thick sample deposited on silicon substrate displayed a TL glow curve peaked at 145 °C. The 500 μm, which was a free standing sample, exhibited higher intensity and a well defined first order kinetics TL glow peak around 289 °C. Both diamond samples showed a linear dose behavior in the 1-50 Gy range and sublinear behavior for higher doses. The 180 and 500 μm samples presented about 80% and 30% TL losses in a 24 h period, respectively, with both samples showing excellent TL reproducibility. The results indicate that the 500 μm CVD diamond film exhibited a good TL behavior adequate for γ radiation dosimetry.
Bibliographical noteFunding Information:
The authors are indebted to Dr. B. Gan for growing the samples and Prof. C. Furetta for enthusiastic and enlighten discussions on the TL glow curve deconvolution procedures. We acknowledge financial support from Oficina de Colaboración Interinstitucional UNAM, SEP and Conacyt Grants No. 36521, 37641 and 32069.
- Chemical vapor deposition
- Diamond films