[en] Tributylphosphate (TBP), dodecane, and mixtures of TBP and dodecane were irradiated at an absorbed dose rate of about 5.0x10¹⁶ eV/g.min with absorbed doses of 6.1x10¹⁸ eV/g to 1.75x10²⁰ eV/g. The irradiated samples were analyzed for gaseous products noncondensible at 161 K and acid products from TBP. The gaseous products observed were hydrogen and methane and the acid products were dibutyl phosphate (DBP) and monobutyl phosphate (MBP). The average yield of hydrogen from dodecane was, G(H₂)=6.71, G(H₂) from TBP was 2.02, and G(acid) from TBP was 3.71. Deviation from mixture law was observed for the yields of hydrogen and acid products for the mixtures of TBP and dodecane. Sensitized decomposition of TBP is indicated. (Auth.)