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However, it’s important to note that some radioactive dates (like those that come from carbon-14) don’t use the isochron method, so they aren’t affected by this particular flaw.
As a young-earth creationist, I look at this issue in a different way.
The amount of Sr-87 that was already in the rock when it formed, for example, should be proportional to the amount of Sr-86 that is currently there.
Since the data are divided by the amount of Sr-86, the initial amount of Sr-87 is cancelled out in the analysis.
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.
In other words, there is a 95% certainty that the age is somewhere between 4,283 23 million years and 4,283 – 23 million years.
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.
Thus, it provides an independent analysis of the rock that does not depend on the radioactive decay that is being studied.
A good isochron was supposed to be rock-solid evidence (pun intended) that the radioactive date is reliable. I suspect that this flaw is not the last one that will be uncovered.If some process brought Sr-87 into the rock, it probably brought different amounts of the atom into different parts of the rock, so the ratio of Sr-87 to Sr-86 won’t stay consistent from one part of the rock to another. He says that there is one process that has been overlooked in all these isochron analyses: diffusion.If a consistent isochron is generated, however, we can be “certain” that no process interfered with the relative amounts of Rb-87 and Sr-87, so the radioactive date is a good one. Atoms and molecules naturally move around, and they do so in such as way as to even out their concentrations.A helium balloon, for example, will deflate over time, because the helium atoms diffuse through the balloon and into the surrounding air.Well, diffusion depends on the mass of the thing that is diffusing. Hayes has brought it up, we can take it into account, right?
Their age was measured to be 6.0 /- 0.3 billion years old. Those who are committed to an ancient age for the earth currently believe that it is 4.6 billion years old.