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Effect of basalt thickness on radiolytic H2 production rates. (A) Volume-normalized radiolytic H2 production for 1-m thick basalt using an average SPG composition of our samples, (B) 1-cm thick basalt, and (C) 100-μm thick basalt. Total production rates are shown as black lines. Rates due to α radiation are shown in blue, β radiation in green and γ radiation in red. X-axis is log scale.
