Application of pulsed optically stimulated luminescence from surface soil to retrospective dosimetry

Fujita, Hiroki

The purpose of this study tries to apply the P-OSL to Japanese surface soil as retrospective dosimetry with ease physical separation. In this study, P-OSL instrument was developed originally. Performance of the instrument was tested using natural quartz extracted from Japanese surface soil and feldspar in mineral specimens. It was found that the signal from the feldspar decayed for 2-3 s and the signal from the quartz was measured over 50 s after the switch-off of the LED. By using mixture of the quartz and feldspar, the P-OSL protocol was improved to determine irradiation dose. Dose recovery test was conducted and then was successful to reconstruct irradiated dose by the P-OSL protocol with the pulse on-time of 4 s and the pulse off-time of 400 s.