منابع مشابه
Proton-induced X-ray Emission
Black particles, collected by filtration (1.2~pm pore size) from the anoxic waters of a soft-water lake, were examined by a scanning proton microprobe which permitted quantitative elemental analysis by proton-induced X-ray emission (PIXE) and Rutherford backscattering (RBS). There was a uniform distribution of sulfur across the filter, but Fe, and to a lesser extent, Mn, was localized in -5-pm-...
متن کاملProton beam characterization by proton-induced acoustic emission: simulation studies.
Due to their Bragg peak, proton beams are capable of delivering a targeted dose of radiation to a narrow volume, but range uncertainties currently limit their accuracy. One promising beam characterization technique, protoacoustic range verification, measures the acoustic emission generated by the proton beam. We simulated the pressure waves generated by proton radiation passing through water. W...
متن کاملThe xenon record of extinct radioactivities in the Earth.
Analyses of xenon from well gas rich in carbon dioxide reveal a large excess of radiogenic xenon-129 from the decay of extinct iodine-129. Smaller excesses observed in the heavy xenon isotopes are from fission. These results place narrow limits on any age difference between the earth and the oldest meteorites. The occurrence of excess radiogenic xenon-129 in well gas also suggests that any quan...
متن کاملLight-induced changes of radioactivities in the 14C-labeled lipids and fatty acids of dark grown Euglena gracilis.
Euglena gracilis was grown in the dark for 12 days in a medium containing sodium acetate1-14C. The major amount of 14C was incorporated into the neutral lipids. In these compounds myristic acid was the main fatty acid labeled. Subsequent growth in light (70 hours) in an iden tical medium (containing unlabeled acetate) led to a strong decrease of radiocarbon in the neutral lipids. The radioacti...
متن کاملA proton induced X-ray emission (PIXE) analysis of concentration of trace elements in varicose veins
Background: Proton induced X-ray emission (PIXE) has been applied as reliable and improved techniques in this study to compare concentration of various trace elements in normal and abnormal varicose veins. Materials and Methods: Five samples from normal veins and 13 samples from varicose veins bombarded by 2.0 MeV energy proton beams produced by a Van de Graff accelerator in vacuum. T...
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ژورنال
عنوان ژورنال: Physical Review
سال: 1938
ISSN: 0031-899X
DOI: 10.1103/physrev.53.447