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Jeong, Hyojoon,Miller, Vivien,Hinton, Thomas G.,Johnson, Thomas E.,Pinder III, John E. Elsevier 2018 JOURNAL OF ENVIRONMENTAL RADIOACTIVITY Vol.189 No.-
<P><B>Abstract</B></P> <P>A model of cesium (Cs) dynamics among the principal biotic and abiotic components of an 11.4-ha impoundment is described. The model is derived from analyses of field measurements of Cs-133 concentrations in pond components for 500 days following the addition of 4 kg of stable Cs-133 to the system. This study differs from similar experiments in which radionuclides, or their stable analogs have been added to small ponds in that the biomasses of key pond components were also obtained. The Cs-133 concentrations and biomasses were used to compute the dynamics of Cs-133 inventories and fluxes among the pond components. The model permits interesting comparisons of Cs-133 transport and fate over time among the pond's abiotic components, primary producers, and two-orders of consumers. The importance of the submerged macrophyte and periphyton community in controlling the transport and fate of the added Cs-133 is quantified. Macrophytes intercepted much of the Cs-133 and slowed its ultimate sequestration by the sediments. The macrophytes' rapid absorption and slow release of Cs-133 prolonged the availability of the element to other pond biota. These data are being used within a subsequent paper to further develop the model into one in which the Cs-133 kinetics are described by transfer coefficients so that effects of changing environmental variables and remediation options can be explored.</P> <P><B>Highlights</B></P> <P> <UL> <LI> “Tabular” model of inventories of <SUP>133</SUP>Cs (in mg) in main biotic components following the addition of 4 kg of Cs-133 to Pond 4. </LI> <LI> Models 8 biota: submerged macrophytes, plankton, periphyton, <I>Chaoborus</I> larva, snails, bluegills, lake chubs, and largemouth bass. </LI> <LI> The evaluation includes an assessment of the daily fluxes of Cs-133 amongst the biotic components. </LI> <LI> The flux of <SUP>133</SUP>Cs from the water → plankton → largemouth bass was 50X less than that of water → periphyton → largemouth bass. </LI> <LI> These inventory and flux data are developed to be utilized in a subsequent kinetic model characterized by transfer coefficients. </LI> </UL> </P>
Analysis of atmospheric dispersion factors for building wakes at the Wolsung nuclear site in Korea
Jeong, Hyojoon,Park, Misun,Hwang, Wontae,Kim, Eunhan,Han, Moonhee Oxford University Press 2013 Radiation protection dosimetry Vol.154 No.4
<P>The characteristics of atmospheric dispersion considering the building effects in the Wolsung nuclear site in Korea were studied using ISC-PRIME and ARCON96 models. The maximum 2-h average atmospheric dispersion factor (ADF) was six times larger when the building geometry was considered in ISC-PRIME and two times larger in the exclusion area boundary.</P><P>Owing to different adjustments for wind speed by the stability class, the ADFs calculated using ARCON96 were smaller than those calculated using ISC-PRIME. Strategies for locating buildings need to be considered to maximise dispersion when planning for constructing several reactors and accessory buildings at the Wolsung nuclear site.</P>
Keum, Dong-Kwon,Jeong, Hyojoon,Jun, In,Lim, Kwang-Muk,Choi, Yong-Ho The Korean Association for Radiation Protection 2018 방사선방어학회지 Vol.43 No.2
Background: A model to assess the activity concentration of agricultural products and the public ingestion dose as result of a nuclear accident is necessarily required to manage the contaminated agricultural systems by the accident, or to estimate the effects of chronic exposure due to food ingestion at a Level 3 PSA. Materials and Methods: A dynamic compartment model, which is composed of three sub-modules, namely, an agricultural plant contamination assessment model, an animal product contamination assessment model, and an ingestion dose assessment model has been developed based on Korean farming characteristics such as the growth characteristics of rice and stockbreeding. Results and Discussion: The application study showed that the present model can predict well the characteristics of the activity concentration for agricultural products and ingestion dose depending on the deposition date. Conclusion: The present model is very useful to predict the radioactivity concentration of agricultural foodstuffs and public ingestion dose as consequence of a nuclear accident. Consequently, it is expected to be used effectively as a module for the ingestion dose calculation of the Korean agricultural contamination management system as well as the Level 3 PSA code, which is currently being developed.
Lee, Sanghoon,Lee, Hyojoon,Thieu, Lam,Jeong, Youncheol,Chang, Taihyun,Fu, Chao,Zhu, Yutian,Wang, Yongmei American Chemical Society 2013 Macromolecules Vol.46 No.22
<P>HPLC elution behavior of isotopically different block copolymers was investigated. A series of three diblock copolymers of hydrogenous polystyrene and deuterated polystyrene (hPS-<I>b</I>-dPS), in which the length of hPS-block is fixed at 18 kg/mol and the length of dPS-block is varied from 17 kg/mol to 80 kg/mol, was synthesized and their retention behavior in liquid chromatography at critical condition (LCCC) was investigated using a C18 coated silica stationary phase and a mixed solvent of CH<SUB>2</SUB>Cl<SUB>2</SUB> and CH<SUB>3</SUB>CN. At this LC separation condition, hPS is retained slightly longer than dPS. The LCCC separations were performed at both LCCC conditions of dPS and hPS established with the same stationary and mobile phases, but at different column temperatures. Since the chromatographic retention difference between dPS and hPS is very small, it was possible to elute the block copolymers at both exclusion and interaction modes at the critical condition of each individual block. We found that the block at its critical condition is not fully “invisible” in both cases. In the LCCC separation at the critical condition of dPS, hPS-<I>b</I>-dPS elutes after the injection solvent peak (interaction mode) due to the stronger interaction of the hPS block. Although they have the same hPS block, they do not coelute but elute in the order of decreasing total molecular weight like an elution in exclusion mode. It clearly demonstrates that the dPS block is not “invisible” at the critical condition but influences the retention of the block copolymers. Monte Carlo simulations of the partition coefficient of A-<I>b</I>-B into a slit pore were performed to give insight on the elution behavior of A-<I>b</I>-B at the critical condition of the B block. The simulation shows that a block under the critical condition influences the retention of the other “visible” block whether the “visible” block is eluted in exclusion or interaction mode. When A is eluted in the interaction mode and B is at its critical condition, the partition coefficient is found to decrease with the increase of the “invisible” B block length, conforming to the observed elution behavior in experiments.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2013/mamobx.2013.46.issue-22/ma4018247/production/images/medium/ma-2013-018247_0010.gif'></P>
Effect of Agricultural Countermeasures on Ingestion Dose Following a Nuclear Accident
Keum, Dong-Kwon,Jeong, Hyojoon,Jun, In,Lim, Kwang-Muk,Choi, Yong-Ho,Lee, So-Hyeon,Jung, Tae-Jong The Korean Association for Radiation Protection 2019 방사선방어학회지 Vol.44 No.1
Background: Management of an agricultural food product system following a nuclear accident is indispensable for reducing radiation exposure due to ingestion of contaminated food. The present study analyzes the effect of agricultural countermeasures on ingestion dose following a nuclear accident. Materials and Methods: Agricultural countermeasures suitable for domestic farming environments were selected by referring to the countermeasures applied after the Fukushima accident in Japan. The avertable ingestion doses that could be obtained by implementing the selected countermeasures were calculated using the Korean Agricultural Countermeasure Analysis Program (K-ACAP) to investigate the efficiency of each countermeasure. Results and Discussion: Of the selected countermeasures, the management of crops was effective when radionuclide deposition occurred during the growing season of plants. Treatment by soil additive and topsoil removal was effective when deposition occurred during the nongrowing season of plants. The disposal of milk was not effective owing to the small contribution of milk to the overall ingestion dose. Clean feeding of livestock was effective when deposition occurred during the growing season of fodder plants such as pasture and rice-straw. Finally, the effect of food restriction increased with the soil deposition density of radionuclide. The practical effect of countermeasures was very small when the avertable ingestion dose was absolutely low. Conclusion: The agricultural countermeasures selected to reduce the radionuclide ingestion dose after a nuclear accident must be made appropriate by considering the accident situation, such as the soil deposition density of the radionuclide and the deposition date in relation to farming cycles.