NONDESTRUCTIVE METHOD FOR DETERMINING THE EU-2(+) CONCENTRATION IN THE ALKALI CHLORIDES

Single crystals of NaCl, KCl and RbCl doped with divalent europium up to 600 p.p.m. were grown by the Czochralski technique. Taking advantage that the Eu2+ ion produces two optical absorption bands in these crystals, calibration constants for determining the Eu2+ concentration in the alkali chlorides by optical techniques are reported. Oscillator strengths of the absorption bands were calculated from the knowledge of the divalent europium concentration. In addition, the distribution coefficient of Eu2+ in NaCl, KCl and RbCl single crystals was determined by the use of this nondestructive method. © 1979 The Japan Society of Applied Physics.