100 free casual sex - Isochron dating methods

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.

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Since a neutron has no charge, it must become positively charged after emitting an electron. Of course, there are all sorts of uncertainties involved.

How much Sr-87 was in the rock when it first formed?

One way this is done in many radioactive dating techniques is to use an isochron. To understand the problem, let’s start with an example of how radioactive dating works. Sr-87 is not radioactive, so the change is permanent.

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.

Was Rb-87 or Sr-87 added to the rock by some unknown process?

Was one of them removed from the rock by some unknown process?

Most likely, the effect will be dependent on the age.

I would think that the older the sample, the larger the overestimate.

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.

That’s just over half a percent error in something that is supposedly multiple billions of years old.

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