Title: Thermoluminescence Properties of Undoped and Nitrogen-doped CVD Diamond Exposed to Gamma Radiation
Citation: RADIATION MEASUREMENTS vol. 43 no. 2-6 p. 379-382
Publication Year: 2008
JRC N°: JRC42231
ISSN: 1350-4487
URI: http://www.sciencedirect.com/science/journal/13504487
DOI: 10.1016/j.radmeas.2007.11.055
Type: Articles in periodicals and books
Abstract: It is known that the thermoluminescence (TL) performance of CVD diamond depends on the impurity concentration and doping materials introduced during growing. We report on the TL properites of undoped and 750 ppm nitrogen-doped CVD diamond grown on (100) silicon substrate. The samples were exposed to gamma radiation from a Gammacell 200 Nordion irradiator in the 10 - 500 Gy dose range at 627 mGy/min dose rate. The nitrogen-doped CVD diamond sample exhibit a TL glow curvge peaked around 573 K and a small shoulder about 411 K and a linear dose behavior in the range 10-60 Gy dose range. In the contrast, the undoped specimen showed a 591 K peaked TL glow curve and linear dose response for 10 - 100 Gy doses. However, both samples displayed a non-linear dose response for doses higher than 100 Gy. The doping effects seem to cause a higher TL efficiency, which may be attributed to the differences in the diamond bonding and amorphous carbon on the CVD samples as well as to the presence of nitrogen. In addition, the nitrogen content may produce some structural and morphological surface effects, which may account for the distinctive TL features and dose response of diamond samples.
JRC Directorate:Space, Security and Migration

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