METHODOLOGICAL PROBLEMS IN THE USE OF RADIOACTIVE TRACERS FOR THE CONTROL OF PROCESSES OF THE RECOVERY OF RARE METALS
Some methodological problems are examined that arise in the use of radioactive tracers (RT) for the control of processes of the recovery of rare metals and the advantages and shortcomings connected with the application of RT are examined. Recommondations are made for the selection of methods for the mass analysis of specimens for Ta and Nb with a view of decreasing the consumption of these materials. The design of a device for measuring ihe activity at differen points of the ingot examined and the resulis of experiments conducted in the investigation oi distribution of Sb along a Ce single crystal which was obiained by drawing from a melt are described. An extensive application of the autoradiographic method is noted, and the technology of the control of the homogeneity of alloys based on rare metals such as Bi, Sb, In, Ga, and Ti is described. It is pointed out that the method of introduction of RT is very important for obtaining correct control results. The tracer and the admixture should be in the same chemical state in the feed substance. Therefore, a specific method of introduction of RT is selected for each particular case. Examples are adduced of the introduction of RT into mobium pentoxide, which is the raw material in preparation of metallic Nb. 57l A survey of the modern technology of preparation and application of various types of heat-emitting elements in reactors and of individual investigations in the field of metallography and metallurgy of U, Th, Zr, and other elements is presented. An examination is made of heatemitting elements on a U and Pu base, elements with fissionable material dispersed in a metallic matrix, ceramic compounds on graphiic, BeO, SiC, and other bases, also of liquid-fuel systems. Some problems are discussed concerning the metallurgy and technology of the production of U and its alloys, as well as of diffusion, corrosion, and chemical equilibrium at elevated temperatures.
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-14-000570
- OSTI ID:
- 4195884
- Journal Information:
- Trudy Komissii Anal. Khim. Akad. Nauk S.S.S.R., Journal Name: Trudy Komissii Anal. Khim. Akad. Nauk S.S.S.R. Vol. Vol: 9
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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