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Essentially, rather than looking at the amounts of Rb-87 and Sr-87, we look at their compared to Sr-86.The ratio of Sr-87 to Sr-86 is graphed versus the ratio of Rb-87 to Sr-86 for several different parts of the rock. Sr-86 is another stable form of strontium, but it isn’t produced by radioactive decay.This false notion is often promoted when radioactive dates are listed with utterly unrealistic error bars.In this report, for example, we are told that using one radioactive dating technique, a lunar rock sample is 4,283 million years old, plus or minus 23 million years old.Was one of them removed from the rock by some unknown process?The isochron is supposed to take care of such issues.How much Sr-87 was in the rock when it first formed?Was Rb-87 or Sr-87 added to the rock by some unknown process?
Such uncertainties are usually glossed over, especially when radioactive dates are communicated to the public and, more importantly, to students.
The elements rubidium and strontium are found in many rocks. As illustrated above, a neutron in a Rb-87 atom can eject an electron (often called a beta particle), which has a negative charge. We know how long it takes Rb-87 to turn into Sr-87, so in principle, if we analyze the amount of Rb-87 and Sr-87 in a rock, we should be able to tell how long the decay has been occurring.
Since a neutron has no charge, it must become positively charged after emitting an electron. Of course, there are all sorts of uncertainties involved.
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