Cilt:03 Sayı:02 (2016)
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Item Analysis of the institutional framework for radioactive waste management in BangladeshMOLLAH, A. S.; SATTAR, Sabiha; ALTAB HOSSAİN, M.; JAHANGİR, M. H.; SALAHUDDİN, A.Z. M.Bangladesh utilizes radioactive materials and radiation sources for a wide variety of peaceful purposes in industry, medicine, agriculture, research and education. At present, Bangladesh does not have nuclear power plant (NPP), so that the radioactive waste is mainly coming from above mentioned fields. Although Bangladesh has quite good infrastructure for the management of present radioactive waste, it needs improvement especially for the disposal program of the existing and future radioactive waste. This improvement of infrastructure is an important factor for preparation of future nuclear power plant (NPP) operation. The framework for institutional radioactive waste management in Bangladesh has been analyzed in this study. The analysis has been done using several key factors based on policy and strategy, regulatory authorities and their regulations, implementing organizations, participation of stack-holders and financial system. By considering the international trends and the Bangladeshi program to utilize nuclear power, the institutional infrastructure of radioactive waste management needs to be improved. The NSRC Rule-97, for the future beneficence, will have to be revised by incorporating several missing key points on radioactive waste management such as definition of radioactive waste, classification of radioactive waste, exempt and clearance limit, storage and retrieval, NORM/TENORM waste, disposal of LILW/HLW and spent fuel.Item MCNP5 element library least squares method for on-line coal analysisREYHANCAN, İ. A.; UNTUÇ, B.; ERDURAN, M. N.One of the current methods for the on-line analysis of the coal is the neutron inelastic scattering and thermal-capture analysis (NITA) for non-destructive in situ measurements of the elemental concentration of a bulk sample. A prototype apparatus (including detector, fast neutron source, bulk sample and shielding materials) was simulated by using MCNP5 (Monte Carlo N-Particle) software package. In the material card of MCNP5, the concentration of these elements of the synthetic coal sample was used by taking into consideration of the rates of the lignite coal reserve in Aegean Region of Turkey. The histograms of the relation between number of particles and energy of the gamma were converted to Gaussian distribution by using response functions of the BGO detector. With the separate simulation of MgO, Fe2O3, CaO, Al2O3, SiO2, S and C, the element library spectrum was obtained in order to fit the spectrum of synthetic coal sample by using MLR (Multiple Linear Regression) method. By using the relation between the coal sample spectrum and the fitted coal spectrum by MLR, the element library least squares (LLs) method was applied to calculate the elemental contents for the relative coal sample.Item Assessment of regulatory requirements in diagnostic X-ray facilities in BangladeshAKTAR, A.; HAIDER, M.; ISLAM, S.M.X-ray imaging is one of the very old powerful modalities of diagnostic procedures. Bangladesh has a history of over 80 years of using X-rays for medical diagnostic purposes. But many of the users do not have enough knowledge about the potential risks associated with ionizing radiation like X-ray. To create awareness on radiation safety, Bangladesh Government for the first time promulgated nuclear safety and radiation control (NSRC) act in 1993 and corresponding NSRC regulation in 1997. The purpose of the current study is to evaluate shielding structure of some diagnostic x-ray facilities in Jessore district of Bangladesh with respect to regulatory standards. Radiation dose levels are also measured at different points in order to investigate the shielding adequacy of the facility. Estimated dose levels were found higher than the regulatory limit (0.5µSv/h) across the entrance door (ED) of 66% facilities. Secondary walls of the X-ray room were found adequately shielded with 10 inch brick wall. The shielding structure of control panel (CP) of the four facilities was not sufficient according to regulation and there was no shielding in the viewing window of CP of two facilities and the lead shielding thickness at the same points of two other facilities was found less than the regulatory requirement 2 mm lead thickness. Only 4 X-ray operators hold a qualified diploma as radiographer among 16 operators which could affect overall radiation safety features.