[en] In this paper, production of high grade pure graphite in Bonab Research Center is reported. Firstly, we will explain the various graphite production process and the results of crystal lattice analysis such as XRD, density and chemical analysis are proposed. The density of manufactured sample is 1.86 g/cm^3which makes it suitable for many high sensitive technical applications. This is the highest grade purity that has been achieved in Iran. The process of manufacturing and the structural diagnosis of the prepared graphite is explained

[en] :Quadrupole ion trap is widely used as an ion storage in gaseous phase and as mass spectrometer. In its classical approach, a sinusoidal voltage form is used to confine the ions in a small region. By using an impulsional voltage, on the other hand, it is possible to increase the mass spectrometer resolution so as to be applicable for separation of light isotopes. In this article we present the theoretical treatment based on the first and second ion stability region. The results show that the first stability region is more adaptable to the impulsional mode of ion trap operation

[en] In this paper, it was attempted to study the temperature dependence responses of some high dose dosimetry systems that are commonly used in Radiation Application Research School, located in the province of Yazd, during the irradiation. In fact, the correction of the read out response of the dosimeters to that of the real absorbed dose values is very important, especially if one needs to measure the precise dose values in medical devices and in foodstuff materials. This is because of the fact that the uncertainty in the measurements is proportional to the sensitivity of the dosimeters, and so it can lead to irrecoverable results in the irradiated products. Thus, in this work we tried to investigate the temperature effects on the dosimeter response and obtain its variation as a function of temperature. The correction coefficient for each of the dosimeters has also been defined

[en] In this article the noise reduction of the experimental data by the Fourier and the wavelet transforms has been investigated. Using both simulated and experimental data (from the plasma focus facility, Dena), the sensitive features of the application of the Fourier transform are visualized and discussed. Then, the main idea of the wavelet transform and the results of the noise reduction with this transform are presented. Due to this investigation, for the cases such as the current derivative of the Dena facility, where the reliability of the Fourier transform can be doubtful, the wavelet transform can be considered as a more accurate alternative approach

[en] In this paper, time dependent neutron transport in fissionable media is simulated by Monte Carlo method, and the neutronic parameters are estimated. In this article, the effective multiplication factor, neutron lifetime, and flux distribution in steady state condition are calculated. The comparison of the results obtained by this method, with those of the experimental measurements and the other calculations have shown that they are in very good agreement

[en] The development of the mathematical model of mass transfer and diffusion process can determine the behavior of dissolved impurities in the flow boiling within viscous sublayer. Application of a new model to calculate the distribution of dissolved impurities concentration within viscous sublayer and estimation of its thickness based on heat conduction layer and evaporation layer (macro-micro layer model) is the major goal of this study

[en] This study was performed with the aim of determination of dose calibrators' accuracy in nuclear medicine centers. Thallium-201 radiopharmaceutical was used for comparison of dose calibrators with each other and with the reference. After the measurement which was carried out in 12 centers located in Tehran and other cities, and according to the data obtained from the reference, it was concluded that dose calibrators in 10 centers are with positive and 2 centers with negative errors, as compared with the reference

[en] The Ion Beam Techniques have opened a new window to study crystal structures and imperfections of crystals. In this paper, we try to briefly describe concepts and applications of Rutherford backscattering spectroscopy-Channeling to determine crystal parameters and disorders. Some experimental results of the analysis of semiconductor materials are presented in this paper, which has been obtained by means of Rutherford backscattering spectroscopy-Channeling technique

[en] In this work, the possibilities of molybdenum content reduction in uranium leach liquor was investigated by adsorption techniques. Several activated charcoals were used as adsorbents. Under the optimized condition, 83.59% of molybdenum was adsorbed with ^Norit PK 0.25-1^activated charcoal. Since the low uranium adsorption is the aim of this work, by performing the optimization conditions, the uranium adsorption with activated charcoal was determined to be 2.74%.

[en] Carbochlorination of ZrO₂ is the main part of zirconium production process. In this research the effect of temperature and total gas flow rate on carbochlorination of ZrO₂ in the presence of carbon black was investigated. The partial pressure of Cl₂ in this study was kept at 0.3 atmosphere. The results showed that ZrO₂ conversion is strongly affected by the temperature. It is also shown that at 1223 K, the process is affected by the gas flow rate. The activation energy of the process was 60 kCal/mol and the chemical reaction on the oxide surface was the dominant controller of the reaction