Potassium argon radioactive dating Chatrandom but no credit card
Possible other sources of correlation Anomalies of radiometric dating Why a low anomaly percentage is meaningless The biostrategraphic limits issue Preponderance of K-Ar dating Excuses for anomalies Need for a double-blind test Possible changes in the decay rate Isochrons Atlantic sea floor dating Dating Meteorites Conclusion Gentry's radiohaloes in coalified wood Carbon 14 dating Tree ring chronologies Coral dating Varves Growth of coral reefs Evidence for catastrophe in the geologic column Rates of erosion Reliability of creationist sources Radiometric dating methods estimate the age of rocks using calculations based on the decay rates of radioactive elements such as uranium, strontium, and potassium.
On the surface, radiometric dating methods appear to give powerful support to the statement that life has existed on the earth for hundreds of millions, even billions, of years.
The beta electrons of the decay into calcium 40 (89.3% of the time) are not accompanied by gamma rays, and are generally absorbed into the medium they find themselves in.
IN2P3Stable nuclei sit at the bottom of a so-called ‘valley of stability’, a concept that helps determine whether a nucleus is radioactive or not.
The decay of potassium into argon produces a gaseous atom which is trapped at the time of the crystallization of lava.
The atom can escape when the lava is still liquid, but not after solidification.
Potassium 40 should be at the bottom of this valley and should be the most stable of the nuclei containing 40 nucleons.
Its mass energy (or internal energy), however, is actually greater than either of its neighbours – calcium 40 and argon 40.
The neutrinos emitted in these captures defy detection.
In both argon 40 and calcium 40, however, the number of protons and neutrons are even, granting them that extra stability.
The very slow decay of potassium 40 into argon are highly useful for dating rocks, such as lava, whose age is between a million and a billion years.
Quite remarkable also is the very long half-life of 1;251 billion years, exceptional for a beta decay.
This is explained by a large jump in the internal rotation (or spin ) of the nucleus during the decay, which almost forbids the transition particularly difficult, therefore making it extremely slow.