Energy Structure and Luminescence of CeF Crystals.

The results of the calculation of the energy band structure and luminescent research of CeF crystals are presented. The existence of two 5d1 and 5d2 subbands of the conduction band genetically derived from 5d states of Ce ions with different effective electron masses of 4.9 m and 0.

Luminescence properties of Ce(3+)-doped NaPrP4O12 polyphosphate.

Studies on the crystal structure and luminescence properties have been performed for the NaPr(1-x)Ce(x)P(4)O(12) polyphosphate series. Excitation and emission spectra of Pr(3+) and Ce(3+) luminescence from NaPrP(4)O(12):Ce(3+) clearly reveal an efficient Pr(3+ ) → Ce(3+) energy transfer via migration over the Pr(3+)-sub-lattice and a nonradiative resonant transfer to the Ce(3+) ions. Analysis on scintillation characteristics of the NaPr(1-x)Ce(x)P(4)O(12) series shows a maximum light yield of 11,000 ± 1000 ph MeV(-1) for NaPr(0.

Crystal structure and luminescence properties of LiYP4O12:Ce3+ phosphor.

LiYP(4)O(12) polyphosphate doped with Ce(3+) ions was prepared by the melt solution technique. The crystal structure, interatomic distances, and atom coordination numbers were determined using x-ray powder diffraction. A study of the spectral-kinetic luminescent properties was performed employing excitation with pulsed radiation from a synchrotron (UV-VUV range) and a laboratory x-ray source.

[New single-photon emission computed tomograph].

The "OFEKT-1" emission tomograph, worked out on the basis of gamma camera, is described. The results of technical and medical testing of the tomograph are presented.

A new effective thermoluminescent material: LiCaAlF6:Ce.

Absorption, emission and thermostimulated luminescence (TSL) of as-grown and X ray irradiated pure and Ce-doped LiCaAlF6 crystals were investigated. Ce-containing samples demonstrate intensive TSL in the UV region (280-310 nm) with a main peak at 350 degrees C. It is found that the well known UV laser crystal LiCaAlF6:Ce is a promising thermoluminescent dosemetric material.