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The fluorescence lifetimes of Eu(III) and Cm(III) doped into crystalline lanthanum hydrate compounds were measured to obtain the calibration between the decay constant k obi (the reciprocal of the excited-state lifetime) and the number of water molecules «H 2 o in the first coordination sphere. The n Hl0 of Cm(III) in various aqueous solutions were calculated using the calibration relation obtained and the lifetime in the literature. All of the nH2o values so calculated were chemically reasonable.

Chemical species of U(VI) in 0.1 Μ Perchlorate solutions in equilibrium with 0.03% C0 2 partial pressure were investigated by time-resolved laser-induced fluorescence spectroscopy. The emission spectra of U(VI) solutions (pH = 3.8 to 7.0) in solidliquid equilibrium with schoepite U0 3 · 2H 2 0 were interpreted by the summation of the emission spectra of the individual components, UO! + (aq), (U0 2 ) 2 (0H)r(aq), (UO 2 ) 3 (0H)i(aq) and U0 2 C0 3 (aq). Numerical evaluation of the emission spectra using the single component of the species gave a satisfactory agreement with the distribution of the species calculated from the formation constants of U(VI)-hydroxides and -carbonate complexes. Emission spectra of the higher carbonate species U0 2 (C0 3 )1" and U0 2 (C0 3 )^ could not be observed.

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Static and dynamic factors were related to the development of myelopathy in OPLL.