Akademik Veri Yönetim Sistemi
Sixth International Conference on Radiation and Applications in Various Fields of Research (RAD 2018), Ohrid, Makedonya, 18 - 22 Haziran 2018
Quartz is the most common mineral in luminescence dating and retrospective dosimetry studies
for reconstruction of either radiation dose in an accident or equivalent dose of archaeological materials.
For dose assessment, luminescence intensity of irradiated sample is compared with the intensity of the
sample irradiated with known dose in the laboratory. The intensity can be obtained by the method
based on optically stimulating called Optically Stimulated Luminescence (OSL). Also Electron
Paramagnetic Resonance (EPR) is a technique based on the detection of paramagnetic defects that are
proportional to the absorbed radiation dose within the material. Thermal stability is one of the
essential properties for a material to be useful in dosimetry studies. Trap centers must be enough stable
to accumulate the radiation dose until the time of measurement. For irradiation, heating and
monitoring the CW-OSL signals, Risø TLDA 20 reader which has an internal 90Sr/90Y beta source was
used. Luminescence emission was detected through U-340 filter. Merck quartz samples were
irradiated with 300 Gy for both CW-OSL and EPR measurements. For thermal stability, samples were
heated from room temperature (~20°C) up to 425°C by the steps of 25°C with a heating rate of 1°C/s,
after monitoring the blue stimulated OSL signals, EPR measurements were done. EPR measurements
were carried out using X-band (∼10 GHz) using a Bruker EMX spectrometer In this study, thermal
stability of Merck quartz CW-OSL and EPR signals were investigated and we tried to see whether there
is a correlation between these two signals. As a result, CW-OSL and EPR signal intensities are similar
with heating between room temperature and 425°C. Both signals were stable up to 250 °C and started
to decrease after this temperature. Above 375°C the signals are totally depleted. By considering the
thermal stability behaviour of CW-OSL and EPR signals, we may talk about a possible correlation
between them.