The influence of the temperature on the yields of light radiolysis products of n‐hexane (‐70 to 60°C) and n‐decane (38° to 150°C) irradiated oy electrons at high dose rates has been investigated. Relative yields of unsaturates reach a maximum at a temperature which is a function of the irradiated alkane and of the gaseous products in the irradiated hydrocaroon. These temperature effects may be explained by a lowering of the solubility and by a competition between organic radicals recombination and hydrogen abstraction from the solvent molecule by these radicals as the temperature is raised.