[en] The compound 1,3-di (2-aminoprimidinyl)-2,2,2,4,4,4-hexachlorocyclodi-phosphazane was prepared. The structure of this aminophosphorous compound was confirmed on the basis of microanalytical data, infrared, ultraviolet and proton NMR spectroscopic evidence. The compound was irradiated by gamma-rays and the ultraviolet measurements before and after irradiation were discussed. The influence of the dose rate on ultraviolet absorption was noticed at various concentrations of aqueous solutions. The PH values were also measured before and after heating as well as before and after irradiation at various dose rates and the correlation between the change in PH values with the ultraviolet absorption shifts were measured for the various concentrations. From the ultraviolet results, it may be suggested that the possible decomposition sites in the compound due to -irradiation are localized in the unsaturated bonds in the hetero aromatic ring. The thermal analysis of the compound and its bacteriological evaluation were also studied