Page 104 - Radiochemistry and nuclear chemistry

Unstable Nuclei atut Radioactive Decay 93

4.14. In the ion source of a mass spectrograph, UF 6 vapor is introduced which partly becomes ionized to UF5 + .
The ionic currents were measured at mass positions 333,330, and 329.The ion current ratios were 13331133o = 139,
and 133011329 = 141.5. What is the half-life of 234U if that of 2~U is 4.5 • 109 y? Radioactive equilibrium is
assumed to exist in the UF 6.

4.20. Literature

W. F. LIBBY, Chemistry of energetic atoms produced in nuclear reactions, J. Am. Chem. Soc. 69 (1947) 2523.
W. GENTNER, H. MAL~R-LEmSrrz and H. BOTHE, An Atlas of Typical Expansion Chamber Photographs, Pergamon
Press 1953.
R. D. EvANs, The Atomic Nucleus, McGraw-Hill, 1955.
E. B. PAUL, Nuclear and Particle Physics, North Holland 1969.
M. G. BOWLER, Nuclear Physics, Pergamon Press 1973.
K. H. LL~..~ER, Chemische Gesichtspunkte fur die Entwicklung von Radionuldidgeneratoren, Radiochim. Acta 23
(2) (1976) 57.
E. BROWNE and R. B. FIRFA'TOI~E, V. S. SHIRLEY (Ed.), Table of Radioactive Isotopes, J. Wiley & Sons, 1986.
Nuclides and Isotopes, 14th Ed., General Electric Company, Nuclear Energy Operations, 175 Curtner Ave.,
M/C397, San Jose, CA 95125, USA, 1989.
M. S. ANTONY, Chart of the Nuclides - Strasbourg 1992, Jan-Claude Padrines, AGECOM, 1 route d'Epfig,
Maison-Rouge, 67600 S~lestat, France, 1992.