OP by Calilasseia » Mar 06, 2010 5:31 am
".. I shall first begin with a discourse on the underlying physics of radionuclide decay, the precise mathematical law that this process obeys, and how that law is derived, both empirically and theoretically."
If your intent by posting all this detail about the physics of radionuclide decay and such is to claim creationists do not agree with this, it is a strawman. This is not the point of disagreement.
"The reason I have chosen these isotopes is very simple. Namely, that they would all be present in measurable quantities in the Earth's crust, and detectable by modern mass spectrometry among other techniques, if the planet was, say, only 6,000 years old, as various enthusiasts for mythology continue to assert. This is because because the half-lives of all these radionuclides are a good deal longer than 6,000 years. So, what do we find when we search for these isotopes in Earth rocks?"
Your argument presupposes that all possible elements were present initially in the earth. On what basis do you assert this? If you are speaking from a stellar evolution position, would it not be more correct to assert that only the elements present in the star that our planet came from would be present? I make this distinction because according to stellar evolution new elements are created within the stars over time.
"Indeed, thanks to the large body of knowledge bestowed upon geologist by inorganic chemists, all manner of tests can be performed in order to determine if transport is likely to be a problem before a sample is submitted for dating analysis, so that this can be taken into account and proper corrections applied to the material in question."
If this is so well established, why are so many radiometric dates rejected after the fact? Since such tests are expensive, why would they do the test without first confirming whether contamination occurred? If this were true there should be virutally no radiometric tests which are claimed to be invalid due to contamination. But it is still typical for a large percentage of tests to not give correct dates according to the evolutionary and old earth paradigms and are therefore posteriotically declared the result of contamination or some such.
"Indeed, scientists have spent time devising a technique, known as isochron dating, whose purpose is specifically that of checking whether the isotopes used for dating have been subject to transport, and developing appropriate corrections to the dates that would have been obtained without such checking."
If isochron dating tests are so accurate and reliable, why are there terms like 'false isochrons'? There are known cases of historic lava deposits which have been dated with the isochron method and gave results of millions or billions of years. Other isochrons have given negative values, meaning the rock should not cool down for millions of years yet. These false isochrons still gave nice linear plots, the supposed indicator that they are correct. They have even done isochron dating on rock samples not from the same location and had nice linear plot results. Radiometric dating, including isochrons, are virtually useless in dating rocks and only show the evolutionary long ages bias of the experimenters because only the results which agree with that bias are accepted as valid.
http://www.icr.org/research/index/resea ... hpbdating/http://www.agu.org/pubs/crossref/2007.. ... 1844.shtml"The moment any detectable traces of Sr87 appear in a sample, however, then we're dealing with a rock that is at least 45 million years old, which flushes blind assertions about the Earth being only 6,000 years old down the toilet to begin with."
This seems to contradict what you said before, when you claimed all possible elements were present initially in the earth, and used it to support your assertion that the earth is old. Now you are claiming that if this particular element is now present it too supports your assertion that the earth is old. The underlying assertion is that Sr87 can only come about through radiogenic decay. How do you know this? That it does come about through radiogenic decay does not mean that has to be the only way it can come about. You even imply in a following statement, "Now, since all the minerals that acquire strontium will acquire the same ratio of Sr86 to Sr87 at the start.." that the initial Sr87 is not necessarily zero.
"Apart from the fact that this mechanism requires ludicrously absurd conditions to have occurred in the Earth's crust in order for it to happen, and apart from the fact that this mechanism is useless for U238 and several other important isotopes used in radionuclide dating, because they do not decay via electron capture, it's actually a waste of time trying to argue against the constancy of the decay law under normal conditions, because this one exception requires such extreme conditions that the Earth would not have remained a solid planet if they had been present."
You imply that this is the only radioisotope which has been found to have it's decay rate changed. Current research proves radiometric decay rates are not constant. The distance the Earth is from the sun affects the decay rates of certain elements, and solar flares also affect decay in others. Therefore a rational person should abandon the position that radiometric decay must have been constant forever into the past, and thus abandon all testing as unreliable which is predicated upon such an assumption.
"But as Fischbach and other scientists looked at their data and data from other labs, a strange trend showed up: the decay rate of at least two isotopes seemed to vary, slightly, with the seasons (during which time the earth’s distance from the sun varies). Further, Purdue nuclear engineer Jere Jenkins observed a decrease in the decay rate of manganese-54 that occurred during a solar flare in 2006."
http://news.stanford.edu/news/2010/augu ... 82310.htmlas quoted in
http://www.answersingenesis.org/article ... 282010#one"Among a number of requirements for a radioactive element and its daughter product to constitute a "clock" for geological events is the necessity that the "clock" run without variation. Well, evolutionist geologists have long ignored the evidence of variability in the radii of pleochroic haloes, which shows that the decay rates are not constant and would, thus, deny that some radioactive elements such as uranium could be clocks. But now there is excellent laboratory evidence that external influences can change the decay rates. Fourteen different radionuclides have had their decay properties changed by effects such as pressure, temperature, electric and magnetic fields, stress in monomolecular layes, etc.
Dudley has proposed, "Rather than assuming that radioactivity is a series of (spontaneous) unrelated events occurring without prior cause, a theoretical approach was developed which translates the ‘neutrino sea’ concept of astrophysics and cosmology to nuclear physics. This postulates a radioactive atom to be a ‘linear resonant system, subject to parametric excitation.’" Thus, the decay constant used in the equations for obtaining ages of geological events becomes a variable dependent on the energy state of all the atom and not just the nucleus. Half-lives would not be constants. The decay constant would instead be a stability index of the element."
http://www.icr.org/article/some-recent- ... with-time/