Abstarct: One of the best sources for fossil fuel replacement is the energy from fusion reactions. . Focus plasma devices were developed in order to achieve this energy and to provide the appropriate conditions for these reactions. these devices are a very good source for producing x - ray pulse, electrons, ion, and neutrons. Focal plasma devices have many applications in industry, medicine and so on due to pulsed X-rays. The main purpose of this thesis is the dosimetry of x - ray emitted from the shahrood university plasma focus (SHUPF), using nitrogen gas at different pressures and voltages by thermoluminescence (TLD) dosimeters, in both experimental and simulated methods. the experimental experiments were simulated by monte carlo method and by MCNPX code. After simulations, the results showed that the highest amount of absorbed dose by the dosimeters was higher in the height of the anode, where pinch was located. according to the experimental results, the maximum absorbed dose in the height range is related to the direction of movement of the electrons after the pinch formation as well as the angles of the device arms. also, the absorption dose of X-rays at different angles was anisotropic and the dose outside the discharge chamber was practically zero and there was only background radiation outside the chamber. The difference between the results of the experiment and the simulation is justified by the experience of the electromagnetic field the motion of the charge affects the velocity of the electrons and then their acceleration, and as a result of the change in the motion of the electrons, the X-rays produced by the radiation brake are variable. but in the simulation with regard to the code used, there is no possibility of defining the electromagnetic field, and so the theoretical results have been obtained without considering the field of electromagnetic variable.