Chlorine 36 dating
The value of the measured ratio depends on the natural Cl concentration in the sample: the higher the natural Cl in the sample (i.e.
the taller the two dark brown columns, while they always keep their proportions) the closer the measured ratio gets to the natural ratio 3.1.
Many Christians have been led to distrust radiometric dating and are completely unaware of the great number of laboratory measurements that have shown these methods to be consistent.
Many are also unaware that Bible-believing Christians are among those actively involved in radiometric dating.
The ages calculated from the chlorine ratios are generally concordant with those from the other methods, implying the constancy of the chlorine input ratio over the last million years.
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Most of the elements in nature are stable and do not change.
Cl can chemically be extracted from any kind of rock or mineral that contains at least one of these target elements, such as limestone, Ca-/K-feldspar or Ca-pyroxene.
Trace amounts of radioactive 36Cl exist in the environment, in a ratio of about (7-10) × 10−13 to 1 with stable chlorine isotopes.
This corresponds to a concentration of approximately 1 Bq/(kg Cl).
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Chlorine has two stable isotopes and one radioactive isotope: the cosmogenic isotope 36Cl. 36Cl decays primarily (98%) by beta-minus decay to 36Ar, and the balance to 36S.
36Cl is produced in the atmosphere by spallation of 36Ar by interactions with cosmic ray protons.