Search results for: Gwang Min Sun

Items from 1 to 20 out of 20 results

article

Application of the INAA methods for KRISS infant formula CRM analysis: standardization of INAA at KRISS

Hana Cho, Kishore B. Dasari, Radojko Jaćimović, Rolf Zeisler, more

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 322 > 3 > 1537-1547

We have established an instrumental neutron activation analysis (INAA) method, including k₀-based INAA, at the Korea Research Institute of Standards and Science (KRISS) for the certification of reference materials. As part of establishing INAA measurements, KRISS infant formula certified reference material was analysed for multiple elements at three different metrological institutes: KRISS and NIST...

article

Study of structural changes for STS 316L using the positron annihilation lifetime spectroscopy

Yeoryeong Jeon, Young Rang Uhm, Gwang Min Sun, Bo-Young Han, more

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 322 > 3 > 1487-1494

The defects due to extrusion strengths and the temperature dependent deformities for low carbon stainless steel (STS 316L) were investigated using positron annihilation spectroscopy. The defects were restored after tempering at 700 °C. The gradients of the peak on the positron annihilation lifetime spectrum for a sample annealed at 700 °C is increased compared to the as extruded sample. In addition,...

article

Monte Carlo simulation study on coincidence-based imaging system for neutron-induced prompt-gamma activation imaging

Han Rim Lee, Jiseok Kim, Gwang Min Sun

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 318 > 3 > 2285-2289

In the present study, a new prompt-gamma activation imaging system was proposed for two-dimensional (2D) elemental distributions. The system, as based on coincidence measurement, consists of a high-purity germanium detector for the measurement of the prompt-gamma energy and a position-sensitive detector for the determination of the emission position. To estimate its feasibility, we performed the Monte...

article

Enhancing neutron spectral results based on the combination of genetic algorithm and activation method

Sy Minh Tuan Hoang, Gwang Min Sun, Hoai-Nam Tran, Ngoc-Thiem Le, more

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 318 > 1 > 631-639

The generated neutron spectrum from KIRAMS MC-50 cyclotron has been adjusted and enhanced by the combination of the genetic algorithm (GA) and activation foil methods. The activation rates were derived from the measurements of Shieldwerx activation foil using the ORTEC HPGe spectroscopy system and applying the GA method to return the adjusted spectral information. It is worth mentioning here that...

article

A proposal on multi-response CADIS method to optimize reduction of regional variances in hybrid Monte Carlo simulation

Do Hyun Kim, Song Hyun Kim, Chang Ho Shin, Gee Suck Kim, more

Annals of Nuclear Energy > 2017 > 104 > C > 282-290

For fixed source problems, it is known that the analog Monte Carlo simulation method can show low efficiencies. To increase the calculation efficiency, variance reduction techniques (VRT) have been introduced and utilized. To apply these techniques, parameters to control particle transport behaviors should be properly determined. The hybrid Monte Carlo methods were developed to automatically determine...

article

Improvement of Switching Speed of a 600-V Nonpunch-Through Insulated Gate Bipolar Transistor Using Fast Neutron Irradiation

Ha Ni Baek, Gwang Min Sun, Ji suck Kim, Sy Minh Tuan Hoang, more

Nuclear Engineering and Technology > 2017 > 49 > 1 > 209-215

Fast neutron irradiation was used to improve the switching speed of a 600-V nonpunch-through insulated gate bipolar transistor. Fast neutron irradiation was carried out at 30-MeV energy in doses of 1 × 10⁸ n/cm², 1 × 10⁹ n/cm², 1 × 10¹⁰ n/cm², and 1 × 10¹¹ n/cm². Electrical characteristics such as current–voltage, forward on-state voltage drop, and switching speed of the device were analyzed and compared...

article

Development of a single photon counting gamma-ray camera for Compton noise elimination

Jiseok Kim, Gwang Min Sun, Sungbok Jin, Sy Minh Tuan Hoang

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 311 > 2 > 1355-1359

In this study, the noise resulting from Compton scattering was quantified when gamma images were acquired with a 50-mm thick scintillator array detectors, and the solution method was proposed to its elimination. To perform it, a system capable of recording the events and occurrence times at each one of the 144 scintillator array elements has been developed. This study also presents that the Compton...

article

On-the-fly Estimation Strategy for Uncertainty Propagation in Two-Step Monte Carlo Calculation for Residual Radiation Analysis

Gi Young Han, Do Hyun Kim, Chang Ho Shin, Song Hyun Kim, more

Nuclear Engineering and Technology > 2016 > 48 > 3 > 765-772

In analyzing residual radiation, researchers generally use a two-step Monte Carlo (MC) simulation. The first step (MC1) simulates neutron transport, and the second step (MC2) transports the decay photons emitted from the activated materials. In this process, the stochastic uncertainty estimated by the MC2 appears only as a final result, but it is underestimated because the stochastic error generated...

article

Application of the ML-EM algorithm in the suppression of Compton background of gamma-ray spectroscopy system

Sy Minh Tuan Hoang, Gwang Min Sun, Hani Baek, Jiseok Kim

Journal of Radioanalytical and Nuclear Chemistry > 2016 > 307 > 3 > 2137-2146

In the present study, the Compton background of the measured gamma-ray spectrum was suppressed by using the deconvolution method with applying the maximum likelihood fitting by expectation maximization (ML-EM) algorithm. The MATLAB program for deconvolution of the measured spectrum were written based on the applying of ML-EM algorithm in conjunction with a matrix of detector response functions within...

article

Monte Carlo ray-tracing simulations for cold neutron beam guides of CONAS

Sy Minh Tuan Hoang, Gwang Min Sun, Jiseok Kim, Hani Baek

Journal of Radioanalytical and Nuclear Chemistry > 2016 > 309 > 1 > 207-218

The cold neutron guides dedicated to the cold neutron activation station (CONAS) at HANARO (KAERI, Republic of Korea) offering a substantial improvement of analytical sensitivity were simulated by using two Monte Carlo neutron ray-tracing packages (McStas and VITESS). In this paper, the estimations of neutron intensities and fluxes were calculated at some particular positions of the two cold neutron...

article

Fabrication of activation foil arrays using printing techniques for evaluation of spatial distribution of neutron flux and energy

Jiseok Kim, Gwang Min Sun, Hani Baek, Sy Minh Tuan Hoang

Journal of Radioanalytical and Nuclear Chemistry > 2016 > 307 > 3 > 2133-2136

Since the activation foil and threshold detector arrays for evaluating the spatial distributions of neutron flux and energy, respectively, have traditionally been manufactured by hand, it was difficult to achieve the precise array density. In this study, a dense foil array with a precision of ≤6 µm was successfully fabricated by using a jet dispenser and printing device to arrange 100 Ag foils in...

article

Room-temperature yield and fracture strength of single-crystalline 6H silicon carbide

Gihyun Kwon, Hyo-Haeng Jo, Sangyeob Lim, Chansun Shin, more

Journal of Materials Science > 2015 > 50 > 24 > 8104-8110

Silicon carbide (SiC) has excellent physical and electrical properties with potential for nuclear applications and power semiconductors. The properties of SiC, however, have not been fully determined. One property in question is the critical resolved shear stress (CRSS) for slip at room temperature. Here we evaluated the CRSS of 6H-SiC using micro-compression tests. Single-crystalline micro-pillars...

article

Development of a gadolinium-loaded liquid scintillator for the Hanaro short baseline prototype detector

In Sung Yeo, Kyung Kwang Joo, Sun Heang So, Sook Hyung Song, more

Journal of the Korean Physical Society > 2014 > 64 > 3 > 377-381

We propose a new experiment on the site of the Korea Atomic Energy Research Institute (KAERI) located at Daejeon, Korea. The Hanaro short baseline (SBL) nuclear reactor with a thermal power output 30 MW is used to investigate a reactor neutrino anomaly. A Hanaro SBL prototype detector having a 60-l volume has been constructed ∼6 m away from the reactor core. A gadolinium (Gd)-loaded liquid scintillator...

article

Optimization of HANARO cold neutron induced prompt gamma activation analysis system by using Monte Carlo code

Sy Minh Tuan Hoang, Gwang Min Sun, Jong Hwa Moon, Yong Sam Chung, more

Journal of Radioanalytical and Nuclear Chemistry > 2013 > 296 > 2 > 967-973

Prompt gamma activation analysis (PGAA) is a nuclear analytical technique for non-destructive determination of elemental and isotopic compositions. The principle of PGAA technique is based on detection of captured gamma-ray emitted from an analytical sample while being irradiated with neutrons. Use of a cold neutron beam guide greatly reduces the gamma-ray background at the analytical sample while...

article

Comparison and determination of elemental composition in Korean space foods using instrumental neutron activation analysis

Yong-Sam Chung, Sun-Ha Kim, Gwang-Min Sun, Jong-Hwa Moon, more

Journal of Radioanalytical and Nuclear Chemistry > 2013 > 298 > 1 > 657-663

A quantitative analysis of mineral contents in several kinds of foods is needed to obtain information on a comprehensive elemental composition as well as an investigation on the effects of human health and nutrition based on the dietary intake of mineral elements. In 2012, six kinds of new Korean space foods (KSF) such as sweet pumpkin porridge, dakgalbi (spicy grilled chicken), Manila clam porridge,...

article

Quantification of Nb and Zr in the irradiated pressure tubes from Wolsong CANDU Unit 1 by neutron activation analysis

Gwang Min Sun, Dong Keun Cho

Journal of Radioanalytical and Nuclear Chemistry > 2013 > 296 > 2 > 1011-1016

When the Wolsong 1st CANDU reactor in Korea is reaching the end of its original lifespan, decommissioning has been one of the largest issues faced by the nuclear industry and the government for the estimation of expense. The radioactive sources in the construction stuffs and components of the reactor such as pressure tubes, steam generators must be evaluated for the estimation of the appropriate expense...

article

Determination of essential elements with functions in oriental medicinal prescriptions for thyroid cancer patients using instrumental neutron activation analysis

Yong Sam Chung, Sun Ha Kim, Gwang Min Sun, Jong Myoung Lim, more

Journal of Radioanalytical and Nuclear Chemistry > 2012 > 291 > 2 > 445-450

The aim of the research is to find out better medicinal stuff for thyroid cancer patients who are required to have a low level iodine diet. Iodine contents in 12 kinds of oriental herbal medicinal prescriptions, which are frequently used for thyroid cancer patients, are determined using instrumental neutron activation analysis. The biological certified reference material was used for analytical quality...

article

Comparison of elemental contents of Korean space foods using instrumental neutron activation analysis

Yong Sam Chung, Sun Ha Kim, Gwang Min Sun, Jong Myoung Lim, more

Journal of Radioanalytical and Nuclear Chemistry > 2012 > 291 > 1 > 223-229

The analysis of mineral contents in space foods is needed to obtain an information on a comprehensive elemental composition as well as the investigation on the effects of human nutrition and health based on the dietary intake of mineral elements. Recently, six items of new Korean space foods (KSFs) such as kimchi, bibimbap, bulgogi, a ramen, a mulberry beverage and a fruit punch which was developed...

article

Application of gamma densitometer for measurement of void fraction in liquid hydrogen moderator of HANARO cold neutron source

Myong-Seop Kim, Jungwoon Choi, Gwang-Min Sun, Kye-Hong Lee

Physica B: Physics of Condensed Matter > 2009 > 404 > 12-13 > 1695-1700

The void fraction in the liquid hydrogen used for the moderator of the HANARO cold neutron source (CNS) was measured by using a gamma densitometer technique. A mock-up of the HANARO CNS facility with an electric heating system as the heat source instead of radiations was constructed. The photon transmissions through the hydrogen moderator were simulated to search for an optimum experimental condition...

article

Determination of thermal neutron radiative capture cross section of 6Li

Chang Su Park, Gwang Min Sun, H.D. Choi

Nuclear Inst. and Methods in Physics Research, B > 2006 > 245 > 2 > 367-370

The thermal neutron radiative capture cross section of ⁶ Li was determined relative to the ¹ H(n,γ) reaction emitting the 2223.25keV γ-ray. The sample used was a mixture of enriched ⁶ Li ₂ CO ₃ and melamine. Background correction was performed by considering the scattering effect of the sample. The determined thermal neutron radiative capture cross section of...

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Keywords

INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS (4)
ANALYTICAL QUALITY CONTROL (2)
COLD NEUTRON (2)
HANARO (2)
KOREAN SPACE FOODS (2)
MCSTAS (2)
ACTIVATION FOIL (1)
ACTIVATION METHOD (1)
BASE SOLVENT (1)
CADIS (1)
CANDU (1)
CERTIFIED REFERENCE MATERIAL (1)
COINCIDENCE-BASED IMAGING SYSTEM (1)
COINCIDENT EVENTS (1)
COLD NEUTRON SOURCE (1)
COMPTON SCATTERING (1)
COMPTON SUPPRESSION (1)
COMPTON SUPPRESSION FACTOR (1)
DATA INTER-COMPARISON (1)
DECONVOLUTION (1)
ELEMENTAL ANALYSIS (1)
ERROR PROPAGATION (1)
FAST NEUTRON (1)
FOOD DATA COMPARISON (1)
GADOLINIUM (1)
GAMMA CAMERA (1)
GAMMA DENSITOMETER (1)
GAMMA SPECTROSCOPY (1)
GAMMA-IRRADIATED FOOD (1)
GAMMA-RAY IRRADIATION (1)
GD-LOADED LIQUID SCINTILLATOR (1)
GEANT4 TOOLKIT (1)
GENETIC ALGORITHM (1)
HIGH-PURITY GERMANIUM (HPGE) DETECTOR (1)
HPGE DETECTOR (1)
HYBRID MONTE CARLO (1)
INFANT FORMULA (1)
IODINE CONTENTS (1)
K0-STANDARIZATION METHOD (1)
LATTICE DEFECT (1)
LI (1)
LIQUID HYDROGEN (1)
MCNPX (1)
MINORITY CARRIER LIFETIME (MCLT) (1)
ML-EM (1)
MONTE CARLO (1)
MONTE CARLO SIMULATION (1)
MULTI RESPONSE (1)
NAA (1)
NB (1)
NEUTRON ACTIVATION ANALYSIS (1)
NEUTRON ENERGY (1)
NEUTRON FLUX (1)
NEUTRON OPTIC INSTRUMENTS (1)
NEUTRON SPECTRUM (1)
NEUTRON-INDUCED ACTIVATION ANALYSIS (1)
NPT-IGBT (1)
ON-THE-FLY (1)
OPTICAL PROPERTIES (1)
ORIENTAL HERBAL MEDICINAL PRESCRIPTIONS (1)
PGAA (1)
POSITION-SENSITIVE DETECTOR (1)
POSITRON ANNIHILATION LIFETIME SPECTRUM (PALS) (1)
POSITRON ANNIHILATION SPECTROSCOPY (PAS) (1)
PRESSURE TUBE (1)
PRIMARY RATIO METHOD (1)
PRINTING TECHNIQUES (1)
PROMPT GAMMA ACTIVATION ANALYSIS (1)
PROMPT-GAMMA ACTIVATION IMAGING (1)
RADIATIVE CAPTURE CROSS SECTION (1)
RAY-TRACING SIMULATIONS (1)
REACTOR NEUTRINO ANOMALY (1)
RECOMBINATION CENTER (1)
REGIONAL VARIANCE (1)
RESIDUAL RADIATION (1)
SCATTERING NOISE (1)
SCINTILLATOR (1)
STANDARD COMPARATOR METHOD (1)
STAY’SL PNNL (1)
STOCHASTIC UNCERTAINTY (1)
STS316L (1)
SWITCHING SPEED (1)
THRESHOLD DETECTOR (1)
THYROID CANCER PATIENT (1)
UNFOLDING SPECTRUM (1)
VARIANCE REDUCTION TECHNIQUE (1)
VITESS (1)
VOID FRACTION (1)
ZR (1)
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Springer (15)
Elsevier (5)

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Search results for: Gwang Min Sun

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