Monograin CdTe powders were grown by recrystallization in isothermal ampoules in the presence of CdCl2 and CdCl2-NaCl liquid phases. The conductivity of n-type CdTe samples quenched from 750 degrees C was high for low sodium concentrations and decreased abruptly by seven orders of magnitude with a simultaneous appearing of photosensitivity at sodium concentrations of C-Na = 10(18) cm(-3). A high n-type conductivity is possibly based on the ionization of the chlorine induced donor defects: Cl-Te(x) --> Cl-Te(o) + e'. A low conductivity at high Na levels may be connected with the compensation of these donors by accepters: Na-Cd(x) + Cl-Te(o) + e --> Na-Cd'Cl-Te(o). The same complex defect can serve as one of the radiative recombination centers of thr 1.4 eV PL band. The 1.4 eV PL band intensity increased with increasing CNa, reached a maximum in the vicinity of C-Na = 10(18) cm(-3) and then decreased abruptly. The latter can be caused by Na-Cd'Na-i(o) or by (Na-Cd'Na-i(o))(2), serving as a-center of non-radiative recombination.