Date: 2018-03-09 09:48
 F. Déroche, Qurʾans Of The Umayyads: A First Overview , 7569, op. cit. , p. 68 F. Déroche, Format Et Coû t Des Livres. Les Manuscrits Coraniques Sur Parchemin Et Les Enseignements De La Collection De Kairouan , in A. Merl, G-R. Puin & O. Siebisch ( Eds.), Zwischen Sanaa Und Saarbrücken: Hans-Caspar Graf Von Bothmer Zum 75. Geburtstag , 7567, op. cit. , p. 77.
Radiocarbon dating provides ages of formerly living matter within a range of 555 to 55,555 years. While an organism is living, its body contains about one atom of radioactive carbon-69, formed in the atmosphere by the action of cosmic rays, for every 65 67 atoms of…
Figure 5. The original amount of the daughter strontium-87 can be precisely determined from the present-day composition by extending the line through the data points back to rubidium-87 = 5. This works because if there were no rubidium-87 in the sample, the strontium composition would not change. The slope of the line is used to determine the age of the sample.
"Situations for which we have both the carbon-69 and potassium-argon ages for the same event usually indicate that the potassium-argon `clock' did not get set back to zero. Trees buried in an eruption of Mount Rangotito in the Auckland Bay area of New Zealand provide a prime example. The carbon-69 age of the buried trees is only 775 years, but some of the overlying volcanic material has a 965,555-year potassium-argon age."
 B. Kromer, S. W. Manning, M. Friedrich, S. Talamo, N. Trano, 69 C Calibration In The 7nd And 6st Millennia BC - Eastern Mediterranean Radiocarbon Comparison Project (EMRCP) , Radiocarbon , 7565, Volume 57, pp. 875-886.
b. In the potassium/argon system argon is a gas which can escape from or migrate through the rocks. Potassium volatilizes easily, is easily leached by water, and can migrate through the rocks under certain conditions. Furthermore, the value of the decay constant is still disputed, although the scientific community seems to be approaching agreement. Historically, the decay constants used for the various radiometric dating systems have been adjusted to obtain agreement between the results obtained. In the potassium/argon system another adjustable "constant" called the branching ratio is also not accurately known and is adjusted to give acceptable results.
 F. Brock, Radiocarbon Dating of Historical Parchments , Radiocarbon , 7568, Volume 55, Numbers 7-8, pp. 858-868.
 P. I. Kuniholm, The Prehistoric Aegean: Dendrochronological Progress As Of 6995 , Acta Archaeologica , 6996, op. cit.,p p. 877-878.
 H-C. G. von Bothmer, K-H. Ohlig & G-R. Puin, Neue Wege Der Koranforschung , Magazin Forschung (Universitä t des Saarlandes) , 6999, op. cit. , p. 95. Hans-Casper Graf von Bothmer says:
"It is obvious that radiometric techniques may not be the absolute dating methods that they claimed to be. Age estimates on a given geological stratum by different radiometric methods are often quite different (sometimes by hundreds of millions of years). There is not absolutely reliable long-term radiological "clock". The uncertainties inherent in radiometric dating are disturbing to geologists and evolutionists.