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Under the project HAVL, the results of safety assessments have revealed the major contribution of radionuclides 129I, 36Cl and 79 Se into public exposure, in terms of dose to human. This study focuses on chlorine. Therefore, it is important to study the behaviour of chlorine in surface environment including soils and plants. To do so 31 samples (soils, litter and humus) from different forests in France (RENECOFOR network) were investigated. Data from this work will allow ANDRA to better model the transfer of radioactive chlorine in biosphere. Our results show a great variability of chlorine in all soil matrices and no correlation between chlorine contents and atmospheric chlorine input was observed. Thus, we conclude that chlorine speciation (organic and inorganic chlorine) must be known to better explain the chlorine biogeochemical cycle in environment.