Measurements
The TL measurements were performed using an automated RISØ TL/OSL reader model DA-20, equipped with calibrated beta (90Sr/90Y)
and alpha (241Am) sources with a dose rate of 0.135 Gy/s and 0.045 Gy/s respectively, a photomultiplier tube (PMT), model 9235/0158/1498AMP, made in USA.
The samples were placed on a controlled heated tray, and were heated to 500°C in N2 with temperature rising at rate of 5°C/s.
The first step in the analysis is to determine the region of thermal stability so each disk was measured twice in the same conditions, the second one is attributed to the background which was subtracted from the first measurement to obtain real TL glow curve.
After the measurement of natural TL, artificial irradiation dose was applied and subsequent TL was measured to build up the plateau test in order to check the TL suitability of the samples by plotting the temperature against the ratio
between TL natural signal and TL artificial signal.
Our samples show a very good constant plateau test between 250–400°C and depending on this region we can determine the integrated temperature range, which we define to obtain the plot of additive dose later.
MeasurementsThe TL measurements were performed using an automated RISØ TL/OSL reader model DA-20, equipped with calibrated beta (90Sr/90Y) and alpha (241Am) sources with a dose rate of 0.135 Gy/s and 0.045 Gy/s respectively, a photomultiplier tube (PMT), model 9235/0158/1498AMP, made in USA. The samples were placed on a controlled heated tray, and were heated to 500°C in N2 with temperature rising at rate of 5°C/s. The first step in the analysis is to determine the region of thermal stability so each disk was measured twice in the same conditions, the second one is attributed to the background which was subtracted from the first measurement to obtain real TL glow curve. After the measurement of natural TL, artificial irradiation dose was applied and subsequent TL was measured to build up the plateau test in order to check the TL suitability of the samples by plotting the temperature against the ratiobetween TL natural signal and TL artificial signal. Our samples show a very good constant plateau test between 250–400°C and depending on this region we can determine the integrated temperature range, which we define to obtain the plot of additive dose later.
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