نتایج جستجو برای: fission track registration technique
تعداد نتایج: 744502 فیلتر نتایج به سال:
The uranium concentrations in teeth samples were determined using a Lexan nuclear track detector and fission tracks registration methodology for 25 of teeth, each weighing (0.7) grams measuring (2) mm thickness, Teeth collected from private clinics government hospitals different areas the city Samawa both males females. Thermal neutron bombardment (U) (241Am-Be) source with flux (5×103 .n.cm-2 ...
Groups of animals (Wistar rats) were fed with rations doped with uranyl nitrate at concentrations ranging from 0.5 to 100 ppm. The uranium content in the ashes of the organs was measured by the neutron-fission track counting technique. The most striking result is that the transfer coefficients, as a function of the uranium concentration, exhibit a concave shape with a minimum around 20 ppm-U fo...
In volatile-rich fluorapatite, which represents 70 % of all fission track age-determinations, tracks produced along the trajectories of fission fragments have been considered to be cylinders of radiation-damaged amorphous material, similar to tracks in other minerals, such as zircon [1]. The atomic-scale structure of unetched fission tracks controls temperature-induced “fading” and finally lead...
In order to determine the pattern and timing of exhumation and uplift in the Teton Range, fission-track analysis of apatites has been applied to three sections encompassing ~ 2 km of vertical relief along the Teton escarpment. The resulting data provide new insights on the doming of the Precambrian-Cambrian unconformity and on the Teton exhumation/uplift history prior to the Miocene initiation ...
Manual identification of fission tracks has practical problems, such as variation due to observer-observation efficiency. An automatic processing method that could identify fission tracks in a photomicrograph could solve this problem and improve the speed of track counting. However, separation of nontrivial images is one of the most difficult tasks in image processing. Several commercial and fr...
Apatite [Ca5(PO4)3(F,Cl)] is a common mineral in rocks that contains ~10 ppm U. U disintegrates by spontaneous fission and the fission fragments produce linear damage trails of ~20 μm length and 5-10 nm width. The lattice damage along such a fission track is repaired at elevated temperatures, leading to a gradual decrease of its etchable length. Since fresh tracks are formed as existing tracks ...
The Tien Shan are the quintessential intracontinental range, situated more than 1000 km north of the suture between India and Asia. Their initiation and growth in the Cenozoic, however, remain poorly understood. In this study we present stratigraphic, detrital fission-track, and magnetostratigraphic results that provide a basis for reconstructing the Cenozoic tectonic evolution of the Kyrgyz Ra...
Abstract “Lipari obsidian and Neolithic human communities in the Aeolian islands” is a project aimed at studying connection between flows on island of Lipari populations archipelago, Italy. As it well known, particular interest to trace prehistorical trading patterns; indeed, has widest distribution been found southern France, Dalmazia, Sicily mainland The outputs will give general vision both ...
This report describes BINOMFIT, a program for estimating components in a mixed distribution of fission-track (FT) grain ages. BINOMFIT has been around for some 10 years, but we have just finished building a Windows version that is much easier to use and provides extensive options for displaying and recording results. The program and source code (Visual Basic 6) are available, along with other F...
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