Some of the problems associated with K-Ar dating are Excess argon.
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Although we now recognize lots of problems with that calculation, the age of 25 my was accepted by most physicists, but considered too short by most geologists.
Thus, if we start out with 1 gram of the parent isotope, after the passage of 1 half-life there will be 0.
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Originally the above proportions were assumed, but today it is more usual to plot 87 Sr:
Description: The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium 87 Rb and strontium 87 Sr, 86 Sr. Your contribution may be further edited by our staff, and its publication is subject to our final approval.