Chlorine 36 dating method Australian private webcams

Laboratory methods followed those described by Zedra and Phillips (2000).

In brief, the samples were dissolved in a mixture of HF and HNO3 and the Cl was extracted as Ag Cl.

The deposition of these erratics clearly occurred during the last glaciation of the region.These ages likely reflect previous exposure of the rock to cosmic radiation.The Foothills erratics originated as one or more rock avalanches on to a valley glacier in the The penultimate glaciation of the Interior Plains, the Illinoian glaciation predates the last interglaciation ca.The rate of chlorine-36 production by cosmic rays (thermal and fast neutrons) depends on the concentrations of potassium (K), Calcium (Ca) and chlorine (Cl), the elevation of the rock, surface orientation, and geomagnetic latitude.The rate of accumulation of chlorine-36 depends on the balance between the production rate of chlorine-36 and on the rate of erosion of the rock surface.The chlorine-36/Cl ratio was measured by accelerator mass spectrometry at PRIME Lab, . Uncertainties related to analytical factors and parameter values are probably on the order of 10%.

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