Volume 3 Article informations Impact of Physical Property Change on Radio Iodine Adsorption in Some Soils Darya Arman, Navid Haydar, Payman Mirza Abstract The soil as a carrier of diverse imperative factors for plants is a significant source of sustainable physical property change. Nevertheless, the influence of thermal utilize on radio iodine 125 in soil with its characteristics are weakly understood. In the present study, the authors evaluate the effects of temperature on different types of soil from nine diverse parts with different climate in Iran. The technique of experiments was mini-column method in which rather more realistic soil conditions than the batch sorption method are upholded. Electrical furnace was employed for offering temperature within fifteen minutes. 445 Bq of 125I were added to soils. After shaking of 500 g soil sample in 140 rpm for 3 min, the radio iodine in soil sub samples was determined by gamma counting for 20 sec. Duplicate sub sample of soil show that the relative error due to homogenization and analysis is less than 10%. In order to elucidate the influence of the temperature itself on the 125I values, sub samples soils were heated at different temperature by electrical heater but no radio iodine were added to them. The observed variability among soils was considerable. Yet, significant temperature impacts on radio iodine 125 abundance or reduction were observed in soils. Also, we observed that the radio iodine adsorption values decreased in 5, 10 and 15°C in humus. In contrast, it increased in clay soil, coarse sand - clay soil, loamy soil, fine sand-clay soil, salty soil, fine sand-coarse sand soil in 20, 30 and 40°C temperatures. These results demonstrate that soil thermal energy can affect radio iodine adsorption in the soil. Knowledge of physical property as temperature variation effect on radio-iodine adsorption of soils is particularly essential for estimating iodide group, especially I-129 transfer to fluvial systems and for successfully measuring radio-iodine enthalpy and entropy in soil studies.