Measurement of hydrogen isotopes by a nuclear microprobe
نویسندگان
چکیده
منابع مشابه
Catalysis of Nuclear Reactions between Hydrogen Isotopes by m^{-} Mesons
The mechanism by which negative p, mesons catalyze nuclear reactions between hydrogen isotopes is studied in detail. The reaction rate for the process (p+d+p, =+He'+p, +5.5 Mev), observed recently by Alvarez et al. , is calculated and found to be in accord with the available data. The p, meson binds two hydrogen nuclei together in the p,-mesonic analog of the ordinary H2+ molecular ion. In thei...
متن کاملThe nuclear microprobe: a unique instrument
There are several features characterising high-energy ion interactions with matter which enables techniques which utilise the high-energy ion beam to have unique or advantageous characteristics. (i) The lack of primary particle bremsstrahlung enables Particle Induced X-ray Emission (PIXE) to be carried out with very little X-ray background, and therefore correspondingly high analytical sensitiv...
متن کاملNew Generation Nuclear Microprobe Systems
Over the past 20 years, the minimum probe size for nuclear microscopy has stayed around 1 micrometre. No breakthroughs in nuclear microprobe design have been forthcoming to produce dramatic improvements in spatial resolution. The difficulties of breaking the constraints that are preventing reduction of the probe size have been well recognised in the past. Over the past 5 years it has become cle...
متن کاملIn situ measurements of calcium isotopes by ion microprobe in carbonates and application to foraminifera
An analytical procedure has been developed for the in situ measurement of calcium isotope composition of carbonates with a spatial resolution of 15–20 μm on a Caméca IMS 1270 ion microprobe. By using two Faraday cup detectors, the Ca and Ca can be measured simultaneously, improving the internal reproducibility. Instrumental mass fractionation (IMF) of calcium isotopes was observed to be indepen...
متن کاملFractionation of Hydrogen Isotopes by Sulfate- and Nitrate-Reducing Bacteria
Hydrogen atoms from water and food are incorporated into biomass during cellular metabolism and biosynthesis, fractionating the isotopes of hydrogen-protium and deuterium-that are recorded in biomolecules. While these fractionations are often relatively constant in plants, large variations in the magnitude of fractionation are observed for many heterotrophic microbes utilizing different central...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2008
ISSN: 1742-6596
DOI: 10.1088/1742-6596/100/6/062029