IN 1949 Kety proposed that if the rate of removal from the site of injection of an intramuscularly injected radioactive isotope was limited principally by flow, then the clearance of the tracer from the injection site could be used to measure local blood flow.' In the past, sodium-24 or iodine-131 has been used for this purpose, but with considerable variability in the results obtained in seria...

We have performed a comprehensive noble gas study, including the isotopes of krypton and xenon, on set micrometeorites (MMs) collected from surface snow at Dome C (DC) Antarctic plateau. He Ne are generally dominated by solar component, with lower 4He concentrations 4He/20Ne ratios in crystalline (Xtal) compared to fine-grained carbonaceous (FgC) MMs. Concentrations (surface-correlated) wind (S...

An atom confined in an optical dipole trap is a promising candidate for qubit. Analyzing the temporal response of such trapped atoms enables us to estimate speed at which quantum computers operate. The present work models formed using crossed laser beams and further examines photoionization time delay from atoms. We study noble gas atoms, as Ne (Z = 10), Ar 18), Kr 36), Xe 54). are considered b...

The shear viscosity and thermal conductivity coefficients of various liquids exhibit minima along certain trajectories on the phase diagram. These arise due to crossover between momentum energy transport mechanisms in gas-like liquid-like regimes. We demonstrate that magnitudes are quasi-universal appropriately reduced units, especially for coefficients. results presented support this observati...

Study of commercially produced volcanic CO2 gas associated with the Colorado Plateau, USA, has revealed substantial new information about the noble gas isotopic composition and elemental abundance pattern of the mantle. Combined with published data from mid-ocean ridge basalts, it is now clear that the convecting mantle has a maximum (20)Ne/(22)Ne isotopic composition, indistinguishable from th...

A review of experimental and theoretical studies of the threshold 11 photoionization of the heavier rare-gas atoms is presented, with particular emphasis on 12 the autoionization resonances in the spectral region between the lowest two ionization 13 thresholds (mp P3/2 and mp P1/2, with m = 2, 3, 4, and 5 for Ne, Ar, Kr, 14 and Xe, respectively). Observed trends in the positions, widths, and sh...