Optically stimulated luminescence study on γ-irradiated ice frozen from H2O and D2O

Optically Stimulated luminescence (OSL) and thermoluminescence (TL) for gamma-irradiated ice samples ha%e been investigated as future dating techniques for icy bodies in the solar system. The OSL around 400 nm lasted more than 600s for gamma-irradiated H2O ice and DO ice under 623-nm-light Stimulation at 90 K the latter was Used to studs the tim,ration of hydrogen atoms, A defect containing trapped electrons is the most suitable explanation of the OSL emissions, The intensity of file TL peals at 120 K increased linearly with gamma-dosage increasing up to 15 kGy for both D2O ice and H2O ice, Intensities of both OSL and TL. for D2O ice were larger than those for H2O ice. The TL peak related to H2O was observed but itS thermal characteristics did not agree with those of OH and HO2 radicals measured by ESR. The OSL method should be employed in future surveys in the solar system.