Alto is an infrastructure for experimental nuclear physics in France that comprises both an on-line isotope-separation facility based on the photofission of uranium and a stableion beam facility based on a 14.5-MV tandem accelerator. The isotope-separation on-line section of Alto is dedicated to the production of neutron-rich radioactive ion beams (RIB) from the interaction of the γ-flux induce...

The performance of Radio-Isotope Identification (RIID) algorithms using NaIbased spectroscopy is increasingly important. For example, sensors at locations that screen for illicit nuclear material rely on isotope identification using NaI detectors to distinguish innocent nuisance alarms, arising from naturally occurring radioactive material, from alarms arising from threat isotopes. Recent data ...

exchange of radioactive isotopes in the culture medium for non-radioactive isotopes in the roots. The fraction of potassium present in the root capable of rapid exchange for isotopes in the culture medium is calculated. This fraction is believed to be associated with the colloidal phases of the protoplasm and cell wall, and for this reason may have a special significance for the study of certai...

Hyperpolarized (83)Kr surface quadrupolar relaxation (SQUARE) generates MRI contrast that was previously shown to correlate with surface-to-volume ratios in porous model surface systems. The underlying physics of SQUARE contrast is conceptually different from any other current MRI methodology as the method uses the nuclear electric properties of the spin I = 9/2 isotope (83)Kr. To explore the u...

The "circle analysis" method of Williams (1969) and a new improved method employing hypothetical grains described in the previous paper have been used to analyze the distribution of autoradiographic grains over erythroid bone marrow cells labeled with radioactive iron, (55)Fe. The resolution obtainable with this isotope was determined by measuring the distribution of grains about a thin line so...

Continuous isotope labeling and tracing is often needed to study the transformation, movement, and allocation of carbon in plant-soil systems. However, existing labeling methods have numerous limitations. The present study introduces a new continuous labeling method using naturally 13C-depleted CO2. We theoretically proved that a stable level of C-CO2 abundance in a labeling chamber can be main...

At the ISOLDE on-line isotope separation facility, the resonance ionization laser ion source (RILIS) can be used to ionize reaction products as they effuse from the target. The RILIS process of laser step-wise resonance ionization of atoms in a hot metal cavity provides a highly element selective stage in the preparation of the radioactive ion beam. As a result, the ISOLDE mass separators can p...

A number of short-lived radioactive isotopes, which existed in the early solar system but are now extinct (e.g., Al (t1/2 = 0.74 Ma) Mg, Mn (t1/2 = 3.7 Ma) Cr, Hf (t1/2 = 9 Ma) W, Sm (t1/2 = 103 Ma) Nd), have proven useful for dating the relative ages of meteorites. Based on the ratio of the stable daughter isotope to a proxy isotope for the parent element, this method only provides relative ag...

Mercury (Hg) vapor is released from dental "silver" tooth fillings into human mouth air after chewing, but its possible uptake routes and distribution among body tissues are unknown. This investigation demonstrates that when radioactive 203Hg is mixed with dental Hg/silver fillings (amalgam) and placed in teeth of adult sheep, the isotope will appear in various organs and tissues within 29 days...