Optical dating of sediments

It uses various methods to stimulate and measure luminescence.It includes techniques such as optically stimulated luminescence (OSL), infrared stimulated luminescence (IRSL), and thermoluminescence dating (TL).A new method for dating sediments is proposed, which determines the time since the sediment was last exposed to sunlight.An argon-ion laser is used to excite electrons from thermally-stable light-sensitive traps and the subsequent luminescence used as a measure of the past radiation dose.

The residual doses of the investigated modern wadi sediment are between 0 and 7 Gy.We have verified the key assumption intrinsic to the method — that the optical signal is zeroed completely upon exposure to daylight.We also show that the rate of zeroing in optical dating is much more rapid than it is in TL dating.The dose distributions of all samples are broadly scattered and have overdispersion values between 25 and 43%, some samples are significantly skewed.The shape of the dose distributions points to other sources of scatter, in addition to partial bleaching.

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