Influence of radioluminescence on optically stimulated luminescence from natural quartz grains

Fujita, Hiroki; Hashimoto, Tetsuo*

The causes of the different optically stimulated luminescence (OSL) sensitivities for quartz aliquots from different origins were investigated concerning influence of radioluminescence (RL) during artificial irradiation. All RL spectra from red-thermoluminescence (RTL) quartz grains consist of two broad RL emission peaks, assignable to a violet region (V-RL) of a 400 nm peak and a red one (R-RL) of a 630 nm one from an on-line RL-spectrometric analysis. The OSL sensitivities were affected on the total amounts of V-RL intensities during irradiation of a fixed total dose (20 Gy) with different dose rates. Additionally, the bleaching effects of RL with shorter wavelength than blue-region were assured from another experiment with the combination of quartz slices and optical filter. Conclusively, it is suggested that the V-RL emissions appreciably affect the residual or naturally accumulated doses when OSL/SAR protocol was applied.