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By K A Gschneider; LeRoy Eyring

The infrequent earths play a different function in technological know-how. those seventeen comparable parts come up with the money for a panoply of refined adaptations deriving from the systematic improvement in their digital configurations, permitting a try of conception with very good solution. against this they locate frequent use in even the main mundane procedures reminiscent of metal making, for sharpening fabrics and gas cracking catalysts. In among are unique makes use of reminiscent of television display phosphors, lasers, excessive energy everlasting magnets and chemical probes. This multi-volume guide covers the full infrequent earth box in an built-in demeanour. every one bankruptcy is a entire updated, severe overview of a selected phase of the sphere. The paintings deals the researcher and graduate scholar alike, a whole and thorough insurance of this interesting box

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99 % Fig. A Schcmt: of the extraction of""Tc from a Purcx process waste solution [18]. The waste solution (Fig. A) is evaporated and the cake containing ''%r and 'I5Nb is removed. To separate Ru. iron(II1) hydrated oxide is precipitated with ammonia. Rare earth metal ions arc removed by precipitation of the hydrated oxides with ammonia. l'hereafter. I1 HNOi) remainins lrom the t'urex process [lo]. 0. 026 GHq)/l iiig Ka2C03. To concentrate 9"Tc. rc because o f its oxidation by nitric acid to TcO, .

Cay. 6. 106 a). 2. 10" a). 1 . 10' a). I n this range of mass numbers. stable isobars of the neighboring clcmcnts molybdenum and ruthenium are known. 'Illus, according t o Mattauch's rule 161, no stable technetium nuclide should exist (Fig. A). An cxplanation for the abscncc of /]-stable isotopes of technetium regarding the odd number (43) of protons was given as carly as 1951 [7]. A lsotopcs and isomers of technetium [1-5]. Spin values not determined expcrimcntally are put in parentheses. 007s70 Half-life Mode and energ!

Chem.. A r t . 3. 167- 179 (1 988) [Jh] K. E. Wildung, ’I:R. Garland. and D. A. Cataldo. Health Phys. 314 -316 (1977) [47] G. I? Rerlyn, S. Dhillon. and E. E. Koslow. G. Menrel. Health Phys. / I . 1325-1332 (1965) 1491 R. C. Koutson and D. A. Cataldo. LIealthPhys. 685 -690 (197X) [SO] J. M. Mousny. I? Koucouu. and C. Myttcnaere. Environm. Exp. Bot. ZY. 263-268 (1979) 151] J. M. Mousny and C. Iloffinnn. C:. Garten, Jr.. J. W. Huckabce. and D. M. Lucas. J. Environ. Oual. 13J-141 (1982) 1531 M. 1.

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