Glen, W., 1982, The Road to Jaramillo, Stanford University Press, Stanford, 459 p. A test of the Ar age spectrum technique on some terrestrial materials. By combining Von Weizsacker (1937) argon abundance arguments, with Kohlhorster (1930) observation that potassium emitted gama-radiation, Bramley (1937) presented strong evidence that potassium underwent dual decay.
The first isotopes of potassium (K) were reported by Aston (1921). Ar step-heating dating technique and about the interpretation of the data generated from a step-heating experiment. On the ultimate disintegration products of the radio-active elements. So with their encouragement I will attempt to explain the method and the criteria used to interpret the data generated from a Ar step-heating experiment. The Ar variation of K-Ar dating grew out of iodine-xenon dating studies of meteorites by Jeffery and Reynolds (1961); also see Reynolds, 1963). In these studies the isotopic ratios of all the noble gases (He, Ne, Ar, Kr, and Xe) of neutron-irradiated meteorites were measured. This led to the discovery of Ar dating method offers a significant advantage over the conventional K-Ar dating technique, because potassium and argon are measured on the same sample by using isotopic ratios of argon, thus eliminating problems associated with sample inhomogeneity. This makes the method ideal for dating small samples such as single mineral grains. One year later Boltwood (1907) developed the chemical U-Pb method. These first "geochronology studies" yielded the first absolute ages from geologic material and indicated that parts of the Earth's crust were hundreds of millions of years old. Sur les radiations invisibles mises par les corps phosphorescents. Ar technique of K-Ar dating a comparison with the conventional technique. Irradiation of samples for Ar dating using the Geological Survey TRIGA reactor.