[en] CdGa₂S₄ single crystals were grown by chemical transport reactions. Roentgen dosimetric properties of CdGa₂S₄ single crystals were studied. It was shown that roentgen sensitivity coefficient (K) of studied single crystal varies at effective hardness of X-rays Va = 25-50 keV and dose rate E 0.75-78.05 R/min. It is established that K for CdGa₂S₄ single crystals increases with an increase in the dose rate E, but with an increase in the accelerating voltage (Va) coefficient K decreases. From roentgen ampere characteristics of Cadges it follows that the dependence of the stationary X-ray current on X-ray dose has a power character. At high dose rate of hard X-rays, α tends to 1.0 for CdGa₂S₄ single crystal