Radioactive decay and mass spectrometry are often used to
Chapter 25, Problem 74(choose chapter or problem)
Radioactive decay and mass spectrometry are often used to date rocks after they have cooled from a magma. has a half-life of years and follows the radioactive decay Arock was dated by assaying the product of this decay. The mass spectrum of a homogenized sample of rock showed the ratio to be 2.25. Assume that the original ratio was 0.700 when the rock cooled. Chemical analysis of the rock gave 15.5 ppm Sr and 265.4 ppm Rb, using the average atomic masses from a periodic table. The other isotope ratios were and The isotopic ratio for 87Rb>85Rb is 0.330. The isotopic masses are as follows: Calculate the following: (a) the average atomic mass of Sr in the rock (b) the original concentration of Rb in the rock in ppm (c) the percentage of rubidium-87 decayed in the rock (d) the time since the rock cooled
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