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U-series evolution diagram showing the activity ratios observed on the Harbin cranium
Light blue lines show U-series evolution in closed-system for selected initial 234U/238U values. Red data points randomly scattered around the evolution curve with initial 234U/238U of 1.70 are considered to be the results of U-uptake processes without the effect of U-leaching. Green data points are probably the results of U-uptake followed by U-leaching.
