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Melt processing of alumina in graphite ambient for dosimetric applications |
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| Authors: | KP Muthe NS Rawat BC Bhatt SK Gupta |
| Institution: | a Technical Physics and Prototype Engineering Division, Bhaba Atomic Research Center, Mumbai 400 085, India b Radiation Safety Systems Division, Bhabha Atomic Research Center, Mumbai 400 085, India c Emeritus Scientist, CSIR, Radiological Physics and Advisory Division, Bhabha Atomic Research Center, Mumbai 400 085, India |
| Abstract: | Carbon-doped alumina samples were prepared by a simple process involving melting of polycrystalline alumina powder in graphite environment. The melting was carried out using an electron gun of a vacuum deposition system meant for deposition of thin films. The samples showed excellent thermoluminescence (TL) and optically stimulated luminescence (OSL) response in the dose range 3 mGy to 1 Gy. Defect centers in the prepared material, as determined by excitation spectra, were found to be similar to those of commercial α-Al2O3:C single crystals. Samples were found to be suitable for radiation dosimetry, with a detection threshold of 50-μGy. Fading in the dark has been found to be<2% for a period of 2 months at room temperature. The variation in OSL response among the samples processed under similar conditions was found to be within ±14%. |
| Keywords: | 29 40 &minus n 47 54 Jk 94 05 Rx |
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