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Keywords: Activity decay.svg Radioactive decay as a function of time The vertical axis shows the number of particles or the activity as a percentage of the initial value; the half life T½ ln 2 where is the average life time Series_RC_resistor_voltage svg 2009-05-31 16 37 UTC Series_RC_resistor_voltage svg User Ktims derivative work Pieter Kuiper <span class signature-talk >talk</span> Radioactivity Half times |