Thermoluminescence characterization of a MWCVD diamond film exposed to β-rays and UV radiation

✍ Scribed by Preciado-Flores, S. ;Schreck, M. ;Meléndrez, R. ;Chernov, V. ;Bernal, R. ;Cruz-Vázquez, C. ;Brown, F. ;Barboza-Flores, M.

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 215 KB
• Volume: 202
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200561901

✦ Synopsis

Abstract

The thermoluminescence (TL) characterization of a 10 µm thick microwave plasma chemical vapor deposited (MWCVD) diamond film grown on a (001) silicon substrate and exposed to β‐rays and ultraviolet (UV) light was performed. Several TL glow peaks between 300 and 580 K as well as a highest intensity first order TL peak located at 610 K are present in the beta radiation exposed samples. UV irradiated samples exhibit mainly the 610 K TL glow peak that is fully the same to beta irradiated samples. The TL creation spectrum of UV exposed samples spans the 200–400 nm range with maximum TL efficiency around 200–230 nm and 300–380 nm. Thus, it covers the whole UV electromagnetic spectrum relevant to human health concern which is related to UV sunlight radiation reaching the Earth's surface. The TL dosimetry response is linear for beta radiation doses below 0.5 kGy. It increases sub‐linearly for higher doses. The UV exposed samples showed a linear–sub‐linear dose behavior and a high sensitivity to UV radiation for beam irradiance of the order of 10^–3^ W/m^2^. A pronounced fading of all the TL peaks was also observed. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)