...Hongyang Fu; Florian Trilsch; Raymond Jonckheere; Lothar Ratschbacher Abstract Fission track analysis is a thermochronologic method for dating rocks and reconstructing their low-temperature thermal histories. We investigate the influence of the apatite composition on the etching of fossil confined...

.... However, its growth process and dynamic mechanism remain unclear. Here, we present new fission track data obtained along a N-S transect near the Puruo Kangri Mountain in the central zone of the Northern Qiangtang terrane. The completely reset apatite fission track ages of detrital samples range from 65.1...

... that a controlled fission chain reaction can be achieved. The heat is generated by splitting the U 235 atoms, which is then used to make steam that spins a turbine to drive a generator and produce electricity. The fission chain reaction that takes place in the core of a nuclear reactor is controlled by moderators...

... a valuable and refined exhumation history and to identify the presence of a former sedimentary cover presently completely eroded. Apatite fission-track (AFT) data have been acquired on the northern part of the Ardenne Massif close to the Variscan front and in the southern Brabant, in particular...

... massif, Sardinia and Corsica. Detrital apatite fission-track dating and zircon fission-track/U-Pb double dating of samples collected from the Saint Antonin basin confirm sediment provenance and allow obtaining first-order estimates of drainage basin maximum and long-term average exhumation rates. Whereas...

... folding and fault slipping along detachment layers, whereas the Tiklik thrust zone involves basement, with its deformation driven by the currently steeply dipping Tiklik fault. Results from apatite fission track thermochronology in combination with growth strata and balanced cross section indicate...

... advance in estimating the age of the Earth. The discovery of fission triggered another period of intense research and, with the onset of World War II, the “Manhattan Project” in the USA. An essential part of the Manhattan Project was the development of isotope-separation techniques to concentrate...

... the 235 U has fissioned, the chemical properties of the radionuclide-forming compounds in the fuel, and the maximum temperatures reached during the accident. The melting of the fuel in an operating or recently shut down nuclear reactor is due to a failure in the ability to cool the reactor core...

...Bernd Grambow; Christophe Poinssot Abstract Used nuclear fuel is a redox-sensitive semiconductor consisting of uranium dioxide containing a few percent of fission products and up to about one percent transuranium elements, mainly plutonium. The rapid increase in temperature in the cores...

... Mineralogist 2009 23 01 2009 10 10 2008 Phosphatian coffinite coffinite uraninite natural fission reactor Bangombé Phosphorous-rich coffinite-(i) with uraninite inclusions and relatively “pure” inclusion-free coffinite-(ii) are characterized by different chemical compositions...

... semiconductor consisting of a fine-grained (5-10 μm), polycrystalline aggregate containing fission-product and transuranium elements in concentrations of 4 to 6 atomic percent. The challenge is to predict the long-term behavior of UO 2 under a range of redox conditions. Experimental results and observations...

... for the increased production of energy: open, closed, or a symbiotic combination of different types of reactor (such as, thermal and fast neutron reactors). The neutron energy spectrum has a significant effect on the fission product yield, and the consumption of long-lived actinides, by fission, is best achieved...

...Rodney C. Ewing Abstract The disposal of fission products and actinides generated by the nuclear-fuel cycle is one of the major challenges in Environmental Sciences of the 21 st Century. Because some fission products ( e.g. , 99 Tc, 129 I, 79 Se and 135 Cs) and actinides ( e.g., 239 Pu and 237 Np...

... to decay spontaneously. Radioactive isotopes, however, undergo spontaneous decay through emission of subatomic particles (β − and β + decay, α decay) or by fragmentation of the parent nucleus (fission). The decay produces a daughter (or daughters) atom that itself is either stable or radioactive. Nuclei...

...Keld Alstrup Jensen; Rodney C. Ewing Abstract Nuclear fission reactors occur in the Oklo-Okélobondo uranium deposit in southeast Gabon. The Okélobondo reactor zone (RZOKE, ∼310 m depth) was the last reactor zone to be excavated before mining was terminated in December 1997. RZOKE is situated...

...Y. CHEN; M. A. ZENTILLI; A. H. CLARK; E. FARRAR; A. M. GRIST; J. WILLIS-RICHARDS Abstract Apatite fission-track (AFT) dates for granitic samples from surface exposures and deep boreholes in the 293.3 ± 1.2 Ma Carnmenellis granite, west Cornwall, decrease radically from 130 ± 28 (2 σ ) Ma at surface...