عنوان مقاله [English]
نویسنده [English]چکیده [English]
Thorium is an actinide substance with an atomic number of 90. Natural thorium is radioactive and, although not fissile, it undergoes a nuclear reaction and then beta radiation into a fissile material of uranium. In this paper, some thermodynamic properties of the thorium have been investigated. On the other hand, the Equation of State (EOS) is an important and suitable tool for studying the thermophysical behavior of materials and predicting them in different conditions in terms of pressure, temperature and amount. At present, there are different equations of state that can be categorized as theoretically, emperically and semi-emperical. The purpose of this paper is to study some thermodynamic functions of thorium in liquid-vapor equilibrium such as vapor pressure, saturated liquid and vapor density, enthalpy and internal energy of vaporization using equations of state in the van der Waals model. In this model, the thermodynamic behavior of materials is due to the contribution of attractive and repulsive forces, which itself is represented as a sum of the aforementioned statements in a compressibility factor. In this research, we use the van der Waals equation, Berthelot equation, and the Radilich- Kwang equation. Our studies show the data obtained from Berthelot equation is in better agreement with experimental data for the studied thermodynamic functions quantitatively and qualitatively.