Can Age Dating methods works without error?
Of course not. Any measurement has some error - that's why the roofers bring a couple of extra squares of shingles when they redo your roof. The errors, though, can be rather astoundingly small, as RAZD showed in wonderful detail early in this thread. A recent example of this sort of dating accuracy is in the 16 January 2009 issue of
Science (Garrick-Bethell
et al.,, vol 323, pp356-359):
{Apollo mission sample}76535 was found in a rake sample from the ejecta blanket of a 10-m-diameter impact crater (21). Four different chronometers (U/Pb, Th/Pb, Sm/Nd, and 40Ar/39Ar) yielded indistinguishable ages of 4.2 to 4.3 billion years (22—26). Its Rb/Sr age is less certain because of spurious effects associated with olivine separates, ranging between 4.61 to 4.38 Ga (24, 27).
the footnotes are from various labs:
22. J. C. Huneke, G. J. Wasserburg, Lunar Sci. VI, 417 (1975).
23. G. W. Lugmair, K. Marti, J. P. Kurtz, N. B. Scheinin, Proc. Lunar Sci. Conf. 7, 2009 (1976).
24. W. R. Premo, M. Tatsumoto, Proc. Lunar Planet. Sci. Conf. 22, 381 (1992).
25. L. Husain, O. A. Schaeffer, Geophys. Res. Lett. 2, 29 (1975). [CrossRef] [ISI]
26. D. D. Bogard, L. E. Nyquist, B. M. Bansal, H. Wiesmann, C.-Y. Shih, Earth Planet. Sci. Lett. 26, 69 (1975). [CrossRef]
27. D. A. Papanastassiou, G. J. Wasserburg, Proc. Lunar Sci. Conf. 7, 2035 (1976).
So yes, the rubidium-strontim date is "in error" - it says those moon rocks are nearly 10% older than the other four methods agree on. And tree rings can err, too - but when you get
the same answer from trees in Germany, trees in Finland, lake-bottoms in Japan, and stalagmites in Nevada, you have to sort of assume that you aren't too far off on that answer.