Abstract
A series of glass samples were prepared from admixtures of Na 2B 4O 7 and Fe 2O 3. The prepared glasses were irradiated for 12 h and 24 h using a gamma-ray dose rate of 206.4 Gy h −1 The optical absorption spectra were recorded for unirradiated and irradiated glass samples. It is found that gamma irradiation shifts the optical absorption edges towards longer wavelengths and introduces a new absorption band at 550 nm for the iron-free Na 2B 4O 7 glass. This induced band disappears on doping with Fe 2O 3 at high concentration. The doping of Na 2B 4O 7 with Fe 2O 3 produces the iron characteristics band at 440 nm which increases in intensity when gamma-irradiated. Thermoluminescence of irradiated Na 2B 4O 7 shows two peaks around 393 K and 550 K and a linear dose-response over the dose range of 100 to 500 Gy which offers a possibility for use as a radiation dosemeter.
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