Results of field measurements of the gamma radiation dose with a frequency domain optical reflectometer are presented. The ability to measure doses up to 100 kGy remotely with an accuracy of up to 20% and reconstruct the absorbed dose distribution profile with a resolution of 15 cm for doses up to 9 kGy is demonstrated. The factors affecting the dynamic range and accuracy of measurements are discussed.
The possibility of effective amplification of self similar frequency modulated pulses (FMPs) in longitudinally inhomogeneous active optical waveguides is studied. Peculiarities of the dynamics of parabolic pulses with a constant frequency modulation rate are considered. An optimal profile of variation of the group velocity dispersion was obtained in correspondence with optimal amplification of a similariton like pulse. The use of FMPs in amplifying and longitudinally inhomogeneous optical waveguides with a correspondingly matched profile of normal dispersion of group velocities is shown to be capable of providing for an amplifi cation of subpicosecond pulses up to energies above 1 nJ.
Disordered Structures of Rare-Earth Scandoborates of the HuntiteFamily.-Single crystals of solid solutions of huntite-type scandoborates (Ln 1 ,Ln 2 )(Lu,Sc) 3 (BO 3 ) 4 (Ln 1 : La, Ce, Nd; Ln 2 : Nd, Gd, Y) are grown and subjected to detailed X-ray and crystallo-chemical analyses. An irregular and disordered structure of these solid solutions is established. -(KUZ'MICHEVA, G. M.; RYBAKOV, V. B.; NOVIKOV, S. G.; AGEEV, A. YU.; KUTOVOI, S. A.; KUZ'MIN, O. V.; Zh. Neorg. Khim. 44 (1999) 3, 352-366; Moskovskii gos. akad. tonkoi khim. tekhnol. im. Lomonosova, Moskva, Russia; RU)
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