Portable Contamination Monitor for Alpha-Beta-Gamma Radiation Measurement with Scintillation Approach

Background: The ionizing radiation dosimeter is considered to be a strategic nuclear product in the nuclear industry. Considering the need to use this product suitable for use in nuclear and industrial centers, it is imperative to localize this product in order to reduce costs and spend a lot of time in order to import them from the major demands of industrial and nuclear centers. Because of the simplicity of the structure and type and scope of the ion chamber, this type of detector can be a good option for dosimeters in industrial irradiation systems. By measuring the ionization flux due to the interaction of the photon with the gas molecules inside the chamber, one can determine the dose of doses in the medium.Methods: In this paper, the simulation of the ion chamber detector, using the gas detector simulator, Garfield, which has the ability to predict the signals obtained from the detector, the ion chamber with closed cylindrical geometry contains air. The difference between the inner radius of the wall and the radius of the central electrode is low and the ratio of the two to one is close. The central electrode is made of aluminum and a wall of conductive plastic, bacillate, or polystyrene, to the thickness of the accumulation in which the electron balance condition is established. To reduce the leakage current, a protective ring was applied to the ground connected between the insulation. The material of this ring was also selected as light and air as possible, such as aluminum.Results: The ion chamber is designed to be online in the form of free air at atmospheric pressure, with dimensions of 10 cm (width) 15cm (depth) and 15 cm (height). If a high-precision dosimetry is required, the chamber volume is reduced according to the desired accuracy. In this plan, a protective electrode is inserted into the collector electrode to make the electrical field more uniform between the electrodes while applying the voltage. The use of graphite spray-coated Plexiglas sheets, which is commonly used today for the production of such ion chambers, uses cylindrical geometry compared to a parallel plate, reducing saturation and is more appropriate. It is also easier to build a detector using cylindrical geometry.Conclusion: The conventional method used for dosimetry of products and equipment in industrial irradiation systems is inactive, so that the dosimeters are read out of the irradiation room. The ion chamber detector is designed to instantly display the amount of dosing in the display. The cylindrical geometry of ion chambers is one of the most suitable instruments for detecting and measuring dosimeters of ionizing radiation. High reliability, fast response, and in particular the relatively low cost of this type of detector, is a characteristic feature of the detector with cylindrical geometry.