International audienceIn 2015 the SAM experiment on board the curiosity rover discovered the first organic molecule endogenous to Mars. This molecule is certainly the result of the reaction of a still unknown molecule with the perchlorates/chlorates present in the Martian soil [1]. Since then, other organics have been discovered: sulfur and nitrogen bearing molecules [2-3] and chlorohydrocarbons [4]. Those chlorohydrocarbons compounds could be generated by a reaction which may occur at Mars’ near-surface induced by the harsh radiative environment, e.g. direct radiation (UV, high energy X- and γ-rays) and secondary photons produced by the interaction of direct radiations with the martian regolith (low energy secondary X-rays). Additionally, ...