what is intial ratio
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initial strontium ratio. ... At its simplest, the initial strontium ratio (common strontium) of a rock is the ratio between the radioactively produced isotope 87Sr and the 'ordinary', non-radiogenic isotope 86Sr at the time when the rock crystallized
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it is the ratio between the radioactivity produced and the ordinary non radioactive atom of Sr 87 and Sr 86
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