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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Radiation Protection and Research
Journal Basic Information
Journal DOI :
Korean Association for Radiation Protection
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Volume & Issues
Volume 30, Issue 4 - Dec 2005
Volume 30, Issue 3 - Sep 2005
Volume 30, Issue 2 - Jun 2005
Volume 30, Issue 1 - Mar 2005
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Evaluation of Neutron Flux Distributions of SMART-P IST Region for the Design of Ex-Core Detector
Koo, Bon-Seung ; Kim, Kyo-Youn ; Lee, Chung-Chan ; Zee, Sung-Quun ;
Journal of Radiation Protection and Research, volume 30, issue 2, 2005, Pages 55~60
The evaluation of neutron flux distribution was performed for the ex-core detector design of SMART-P. DORT and MCNP code were used for the calculation of energy-dependent neutron flux distribution at 100% full power condition. Two code results show that maximum thermal flux appears at the
water region in IST region and agree within 10% difference. In addition, another evaluation was performed code with assumptions that cote was composed of fission source and control rod without fuel assemblies. These assumptions make neutron count rate to be minimized. As a results, maximum thermal flux showed
, when the strength of initial fission source was assumed as
. The main reason of these results is due to the thermalization of fast neutrons in the water region and thermal flux is proportional to 80% of total neutron flux. Therefore, optimization of filler material of detector guide tube, position of installation and axial length of detector segments is necessary for the design of ex-core detector to enhance the neutron count rate and above results could be used in ex-core detector design as a fluence requirement.
Application of the HELIOS-MASTER Code System on the Criticality Analysis for the SMART-P Spent Fuel Storage
Kim, Ha-Yong ; Koo, Bon-Seung ; Kim, Kyo-Youn ; Lee, Chung-Chan ; Zee, Sung-Quun ;
Journal of Radiation Protection and Research, volume 30, issue 2, 2005, Pages 61~67
The criticality analysis method using HELIOS-MASTER code system, which is the nuclear core analysis code system, was developed for the spent fuel storage of SMART-P reactor. We generated the macroscopic cross section of the geometric model with HELIOS and estimated the criticality of the 3-dimensional model with MASTER for SMART-P spent fuel storage. The validity of criticality analysis method for SMART-P spent fuel storage with the HELIOS-MASTER code system by 3-D MCNP calculation was also verified. The result of the criticality analysis with the HELIOS-MASTER code system is more conservative than that with the MCNP and the accuracy of this result is within the range of an allowable error. Because HELIOS-MASTER can perform the 3-D depletion calculation lot a spent fuel storage, it will be useful to perform the criticality analysis including a burnup credit in future.
Calculation of Primary Electron Collection Efficiency in Gas Electron Multipliers Based on 3D Finite Element Analysis
Kim, Ho-Kyung ; Cho, Min-Kook ; Cheong, Min-Ho ; Shon, Cheol-Soon ; Hwang, Sung-Jin ; Ko, Jong-Soo ; Cho, Hyo-Sung ;
Journal of Radiation Protection and Research, volume 30, issue 2, 2005, Pages 69~75
Gas avalanche microdetectors, such as micro-strip gas chamber (MSGC), micro-gap chamber (MGC), micro-dot chamber (MDOT), etc., are operated under high voltage to induce large electron avalanche signal around micro-size anodes. Therefore, the anodes are highly exposed to electrical damage, for example, sparking because of the interaction between high electric field strength and charge multiplication around the anodes. Gas electron multiplier (GEM) is a charge preamplifying device in which charge multiplication can be confined, so that it makes that the charge multiplication region can be separate from the readout micro-anodes in 9as avalanche microdetectors possible. Primary electron collection efficiency is an important measure for the GEM performance. We have defined that the primary electron collection efficiency is the fractional number of electron trajectories reaching to the collection plane from the drift plane through the GEM holes. The electron trajectories were estimated based on 3-dimensional (3D) finite element method (FEM). In this paper, we present the primary electron collection efficiency with respect to various GEM operation parameters. This simulation work will be very useful for the better design of the GEM.
Properties and Peculiar Features of Application of Isoelectronically Doped
Ryzhikov, V. ; Starzhinskiy, N. ;
Journal of Radiation Protection and Research, volume 30, issue 2, 2005, Pages 77~84
The authors submit the data concerning the methods of obtaining semiconductor scintillators on the basis of the zinc chalcogenide crystal doped with impurities (Te, Cd, O,
Al, In, etc.). Characteristics of such crystals and mechanisms for the semiconductor scintillator luminescence are described as well. The scintillator luminescence spectra maximums are located within the range 450-640nm, which depends on the method of preparing the scintillator. The luminescence decay time ranges within
. The afterglow level is less than 0.01% after
, and the radiation stability is
rad. Thermostability of the output characteristics of new semiconductor scintillators on the basis of zinc selenide is prescribed by thermodynamic stability of the principal associative radiative recombination centers that come into existence due to the crystal lattice inherent imperfections. Certain application fields of the new scintillators are examined taking into account their particular qualities.
Some aspects of scintillation mechanism in organic molecular dielectrics
Galunov, N.Z. ; Grinev, B.V. ; Tarasenko, O.A. ; Martynenko, E.V. ;
Journal of Radiation Protection and Research, volume 30, issue 2, 2005, Pages 85~89
Aspects of the scintillation mechanism in organic systems obtained on the base of precise measurements of the radioluminescence pulse shape are discussed. It shown that the process of scintillation light pulse formation is mainly determined by initial conditions of exited states generation.
Radiological Risk Assessment for the Public Under the Loss of Medium and Large Sources Using Bayesian Methodology
Kim, Joo-Yeon ; Jang, Han-Ki ; Lee, Jai-Ki ;
Journal of Radiation Protection and Research, volume 30, issue 2, 2005, Pages 91~97
Bayesian methodology is appropriated for use in PRA because subjective knowledges as well as objective data are applied to assessment. In this study, radiological risk based on Bayesian methodology is assessed for the loss of source in field radiography. The exposure scenario for the lost source presented in U.S. NRC is reconstructed by considering the domestic situation and Bayes theorem is applied to updating of failure probabilities of safety functions. In case of updating of failure probabilities, it shows that 5 % Bayes credible intervals using Jeffreys prior distribution are lower than ones using vague prior distribution. It is noted that Jeffreys prior distribution is appropriated in risk assessment for systems having very low failure probabilities. And, it shows that the mean of the expected annual dose for the public based on Bayesian methodology is higher than the dose based on classical methodology because the means of the updated probabilities are higher than classical probabilities. The database for radiological risk assessment are sparse in domestic. It summarizes that Bayesian methodology can be applied as an useful alternative lot risk assessment and the study on risk assessment will be contributed to risk-informed regulation in the field of radiation safety.