Why are you asking for this on an internet message board? I would think that a research lab connected to a university or large company would be a better source.
They would also have experienced scientists and lab technicians who would probably be willing to give advice and pointers on the project. If your project sounds productive and fruitful, maybe some would be willing to become involved in it with you.
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PS: I think the assumption of zero captive argon in a lava sample is not a good assumption. I do not know how much this affects the result but I will evaluate that as a sensitivity.
I'm not sure, but I think that the isochron method is commonly used in K-Ar dating. In that case, the amount of initial ratio of argon to potassium is irrelevant. The people at the labs you contact might also be able to fill you in on the basics of radiometric dating methods.
Edited by Chiroptera, : No reason given.
Edited by Chiroptera, : minor typo
Speaking personally, I find few things more awesome than contemplating this vast and majestic process of evolution, the ebb and flow of successive biotas through geological time. Creationists and others who cannot for ideological or religious reasons accept the fact of evolution miss out a great deal, and are left with a claustrophobic little universe in which nothing happens and nothing changes.
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M. Alan Kazlev