my source discusses both of your concerns (leaching and ar/ar).
36 argon is not used in modern radiometric dating, 40Ar/39Ar is.
this too is discussed.
next.
As I said before, your source utilizes "intellectual dishonesty" by not including how specific problems are avoided. Furthermore, 36Ar is most certainly used in modern radiometric dating. Where did you get the idea that it doesn't, your dishonest source by the M.D.?
Here is how it is utilized. 40Ar in a sample has its origin from the decay of the parent 40K. However, 40Ar is also a constituent of the atmosphere and the source of contamination of excess 40Ar. 40Ar in the atmosphere is always accompanied by the stable isotope 36Ar at a ratio of 296:1, thus enables a correction to be made for the presence of any atmospheric 40Ar. Furthermore, the measurement of 36Ar also enables the isochron technique to be employed. Does your source describe what I just described, or did to mention Ar/Ar dating without mentioning the all important constant atmospheric ratio of 40Ar to 36Ar (296:1) and how it is utilized.
Again, my source: M. Walker, Quaternary Dating Methods, 2006. Mike is the author of the textbook I cited as well as coauthor in two other dating on dating method textbooks that are utilized globally in Earth Science education. Additionally, he has published over 150 papers in the scientific literature, not to mention other research and academic distinctions.
Your source, an M.D., has probably has never even taken even an introductory course in geology, much less geochemistry or dating methods. Do you think that an M.D. would send a patient with heart problems requiring surgery to a Urologist for that surgery? Of course not. Then why does he give advice in an area that is more than obvious well out of his expertise? One does not study dating methods either in pre-med or medical school.
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