Radio-tracer technique

At this point we are really at the closest approach to a Comprehensive Theory, because the initiation by AlX+2, expressed by Equation (iv), has now been proved for isobutene and made very probable for styrene and norbornadiene by a radio-tracer technique which leaves little room for any alternative explanation [8]. 

We thank Prof. J. C. Bevington for providing facilities for D.W.G. to learn radio-tracer techniques, Prof. E. J. Goethals for helpful comments, and the Science Research Council for equipment. 

Recovery of Ammunition Items Using a Radio-tracer Technique (Ref 12)... 

M. Simonyi, I. Fitos, Z. Tegyey, and L. Otvos, Stationary uitrafiltration a radio-tracer technique for studying stereoselective binding of racemic ligands, Biochem. Biof ys. Res. Commun., 97 1 (1980). 

A more detailed study of the dehydration of 2-phenyl-1-propanol was reported and a radio tracer technique using C was used to delineate the mechanism. Of the reaction products, the allyl benzene formed was labelled only on the benzylic carbon and was thus produced by y hydrogen abstraction and concerted phenyl migration. In the a-methylstyrene, the label was equally distributed between the I and 3 carbon atoms and this product arose either through a symmetrical cyclopropane intermediate or a tertiary carbonium ion. viz-... 

Another type of poisoning which has been extensively studied by radio-tracer techniques is the loss of catalytic activity due to the accumulation on the surface of strongly retained carbonaceous species, sometimes referred to as coke. Radiotracer experiments with [14-C]labelled ethylene, hex-1-ene, and cyclohexene on Pt black showed that catalyst deactivation was accompanied by progressive build-up of hydrocarbon residues on the surface. ... 

The diffusion of zinc in n- and p-type aluminium antimonide was measured at 660 to 860C by using a radio-tracer technique. At high donor concentrations, the diffusion constant was found to decrease. The diffusion was described by ... 

Abstract On the basis of the comparative radiotracer study of the adsorption of sulfate and pertech-netate ions on y-Al203, it is shown that the application of the radio-tracer technique allows us to distinguish specific and nonspecific adsorption without the knowledge and the use of quantitative data as to the extent of the adsorption or the... 

Okuyama, M., Tsunogai, M., Watanabe, N., Asakura, Y., and Shigematsu, A. (1995). Study of the de novo synthesis of cholesterol in rat bile a newly developed radio-tracer technique, TLC-autoradioluminography. Biol. Pharm. Bull. 18 1467-1471. 

This form of the Gibbs fundamental equation demonstrates the importance of surface and interfacial tension measurements of interfacial layers out of the adsorption equilibrium. These methods are the most frequently used techniques to follow the time-dependence of the adsorption process. However, for very slow processes, which occurs in systems with extremely small amounts of surfactants, other methods such as the radio-tracer technique and ellipsometry, or the very recently developed technique of neutron reflectivity, can be used to directly follow the change of surface concentration with time. 

Fig. 5 shows the results of a study involving the typical equilibrium-type experiment where a fixed water-oil ratio was injected into a core to equilibrium and the resulting saturation determined by radio tracer techniques according to Jennings. A 1-in. diameter by 10-in. long sand pack mounted in plastic with a special mixing inlet end plate was flooded with brine and then saturated with crude oil containing radioactive ditolyl selenide tracer. The core was flooded with oil... 

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