Inter-laboratory comparison of fission track confined length and etch figure measurements in apatite
نویسندگان
چکیده
منابع مشابه
Cooling history and exhumation of the nepheline syenites, NW Iran: constraints from apatite fission track
Thermal history and apatite fission-track ages were determined for the Kaleybar, Razgah and Bozqush alkaline intrusions which display Eocene-Oligocene stratigraphic age. These subduction-related intrusions are located in the Alborz-Azarbaijan magmatic belt which is characterized by a Paleogene magmatic flare-up associated with extensional/transtensional tectonism. The mean of Uranium content an...
متن کاملImproved fission-track length measurements using ion irradiation
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 ...
متن کاملMeasurements of fossil confined fission tracks in geological samples with low track densities
Several natural minerals contain trace amounts of uranium. Spontaneous nuclear fission of U causes the formation of particle (fission) tracks along the trajectories of the ejected nuclear fragments. The lattice damage along a fission track is repaired at elevated temperatures, leading to a gradual reduction of its etchable length that depends foremost on the highest temperature that the track h...
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testing plays a vital role in any language teaching program. it allows teachers and stakeholders, including program administrators, parents, admissions officers and prospective employers to be assured that the learners are progressing according to an accepted standard (douglas, 2010). the problems currently facing language testers have both practical and theoretical implications but the first i...
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ژورنال
عنوان ژورنال: American Mineralogist
سال: 2015
ISSN: 0003-004X
DOI: 10.2138/am-2015-5167