decay series
61Uranium-uranium dating — is a radiometric dating technique utilizing the comparison of two isotopes of uranium (U) in a sample: 234U and 238U. 234U/238U dating is one of several radiometric dating techniques exploiting the uranium radioactive decay series, in which 238U… …
62Isotopes of uranium — Uranium (U) is a naturally occurring element with no stable isotopes. In other words, all uranium is radioactive and hence vanishing by radioactive decay, yet it is also found in great quantity in the earth s crust. The natural isotopes are… …
63Radium — The celebrated radioactive element discovered by Marie and Pierre Curie in 1898. * * * A metallic element, atomic no. 88, extracted in very minute quantities from pitchblende; 226Ra, its longest lived isotope, is produced as an intermediate in… …
64uranium — /yoo ray nee euhm/, n. Chem. a white, lustrous, radioactive, metallic element, occurring in pitchblende, and having compounds that are used in photography and in coloring glass. The 235 isotope is used in atomic and hydrogen bombs and as a fuel… …
65Potassium-argon dating — or K Ar dating is a radiometric dating method used in geochronology and archeology. It is based on measuring the products of the radioactive decay of potassium (K), which is a common element found in materials such as micas, clay minerals, tephra …
66thorium — thoric /thawr ik, thor /, adj. /thawr ee euhm, thohr /, n. Chem. a grayish white, lustrous, somewhat ductile and malleable, radioactive metallic element present in monazite: used as a source of nuclear energy, as a coating on sun lamp and vacuum… …
67Rutherford, Ernest, Baron Rutherford of Nelson, of Cambridge — ▪ British physicist Introduction born Aug. 30, 1871, Spring Grove, N.Z. died Oct. 19, 1937, Cambridge, Cambridgeshire, Eng. New Zealand born British physicist considered the greatest experimentalist since Michael Faraday (Faraday, Michael)… …
68Astatine — (pronEng|ˈæstətiːn) is a radioactive chemical element with the symbol At and atomic number 85. It is the heaviest of the discovered halogens. Characteristics This highly radioactive element has been confirmed by mass spectrometers to behave… …
69Han van Meegeren — Infobox Person name = Han van Meegeren image size = 250px caption = Before his trial Han van Meegeren demonstrated his forgery techniques before an expert panel by painting his last forgery Young Jesus preaching in the Temple birth name =… …
70Isotopes of radon — There are thirty four known isotopes of radon (Rn). The most stable isotope is 222Rn, which is a decay product (daughter product) of 226Ra, has a half life of 3.823 days and emits alpha particles. 220Rn is a natural decay product of thorium and… …
