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    “One little bit doesn’t make a difference.” It’s a good job CMI didn’t think like that.We had to start somewhere producing information, one word and one article at a time.is a radiometric dating method invented to supersede potassium-argon (K-Ar) dating in accuracy.The Washington Post article Scientists discover hundreds of footprints left at the dawn of modern humanity describes the geological dating of stratified layers of mud by analyzing and dating minerals within each layer.The principal materials for dating East Africa hominid sites are volcanic ashes, yet many of these ashes are not deposited as primary air fall (Greek for ash).Prior to 1905 the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.Using the argon-argon dating technique, by which scientists measure the decay of an isotope called Argon-40 into Argon-39 in order to find the age of crystals, they came up with a rough approximation of the footprints' age: 19,000 years at the oldest, 10,000 or 12,000 years at the youngest.I can't exactly follow the logic, but I'm asking here about the dating process itself. I do not think that Argon-40 decays into Argon-39 as the article states, at least not all by itself. Based on the atmospheric 40-Ar/36-Ar ratio and the 36-concentration, the 40-Ar concentration at the time of formation is calculated.

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    The quantitative approach is admirable, but Buffon's assumptions are flawed. Silicate minerals have lower heat conductivity than steels and are better insulators leading to slower cooling rates.We can see how do deal with this if we take a particular case. For example the amount of Rb in mantle rocks is generally low, i.e. The mantle thus has a low If these two independent dates are the same, we say they are concordant.Chronological Analysis of the Scriptures- Literal interpretation of the scriptures led some people to conclude that the Earth was created approximately 6,000 years old.But since floods jumble materials of different origins and ages together, that meant the scientists had to date dozens of different minerals.The youngest crystal in the footprint layer would represent the oldest possible age for the prints; the oldest crystal in the layer above it would represent the youngest they could be.In the past two decades, particularly, discoveries of our fossil ancestors have been made in unprecedented numbers and diversity.Detailed studies of these fossils provide new insights into human evolution, such as the origin of locomotion and cultural activity, and the evolution of the brain, among many other complex features that have come to define humanity.By definition, D* = N-1) (2) Now we can calculate the age if we know the number of daughter atoms produced by decay, D* and the number of parent atoms now present, N.The only problem is that we only know the number of daughter atoms now present, and some of those may have been present prior to the start of our clock. The reason for this is that Rb has become distributed unequally through the Earth over time.The Potassium 39 in the sample is irradiated to become Argon 39, then the ratio of the gas is compared.During the latter half of this century anthropological surveys in East Africa have made significant contributions to understanding how the human species has evolved.And when I look at the Wikipedia article, the discussion is so technical and defensive that I can't actually picture what is going on. You are right: there is no decay of 40-Ar into 39-Ar. The difference between measured 40-Ar and 40-Ar at formation is used in the procedure.But then, different passages in the Wikipedia article contradict each other (first section: 39-K is converted into 39-Ar by neutron bombardment; but "age equation" section: 40-K is bombarded; I think it should be 39-Ar).After the passage of two half-lives only 0.25 gram will remain, and after 3 half lives only 0.125 will remain etc.

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