[en] This report contains the measurements and evaluation of production cross sections of some medically and technologically important radionuclides over the energy range 1-40 MeV by using a conventional stacked-foil activation technique combined with high purity germanium (HPGe) -ray spectrometry. The irradiations were done by using the external beam line of the MC-50 cyclotron at the Korea Institute of Radiological and Medical Sciences (KIRAMS). The standard cross sections for monitor reactions were taken from IAEA web site. Integral yields for the investigated radionuclides were deduced using the measured cross-sections. Reported data were compared with the available literature data, theoretical calculations by the codes TALYS and ALICE-IPPE, and a good overall agreement among them was found

[en] Highlights: • Red-emitting BaWO_4:Eu phosphors were prepared in hexane-water bilayer system. • The hydrophobic nanometer-sized BaWO_4:Eu phosphors were obtained in hexane. • The hydrophilic micrometer-sized BaWO_4:Eu dendrites were obtained in water. - Abstract: BaWO_4:Eu phosphors were prepared by performing a solvothermal reaction in a water–hexane bilayer system. A barium oleate (and europium oleate) complex was obtained in hexane via a phase transfer reaction involving Ba"2"+ (and Eu"3"+) ions in an aqueous solution of sodium oleate. The outer surfaces of the nanometer-sized BaWO_4:Eu phosphors were capped by the long alkyl chain of oleate; therefore, the hydrophobic nanometer-sized BaWO_4:Eu phosphors preferentially dissolved in the hexane layer. The micrometer-sized BaWO_4:Eu phosphors were obtained in the water layer. The BaWO_4:Eu phosphors prepared in hexane and water yielded sharp strong absorption and emission peaks at 464 and 615 nm, respectively, due to the "7F_0 → "5D_2 and the "5D_0 →"7 F_2 transitions of the Eu"3"+ ions. The BaWO_4:Eu phosphors are good candidate red-emitting phosphors for use in InGaN blue-emitting diodes, which have an emission wavelength of 465 nm.

[en] The InOOH and In(OH)₃ products were selectively synthesized through a hydrothermal reaction while adjusting the amount of water. h-In₂O₃ and c-In₂O₃ products were selectively prepared through the thermal oxidation of the InOOH and In(OH)₃ products, respectively, as precursors. The morphology of the InOOH, In(OH)₃, h-In₂O₃, and c-In₂O₃ products were examined. The photocatalytic activities of h-In₂O₃ and c-In₂O₃ were better than commercial In₂O₃. Deethylation was observed during the photodegradation of RhB in the presence of h-In₂O₃ or c-In₂O₃. Indium oxide (In₂O₃) is an important semiconductor with a wide band-gap of 3.6 eV that has been widely used in solar cells, gas sensors, optoelectronics, and photocatalysis. Many efforts have been devoted to the synthesis of In₂O₃ with various morphologies, such as nanocubes, nanotubes, nanotowers, nano-rods, and hollow spheres. In₂O₃ has two phases of hexagonal In₂O₃ (h-In₂O₃) and cubic In₂O₃ (c-In₂O₃).14,15 Most of the synthetic methods have focused on preparing one of the two In₂O₃ phases. However, relatively little is known about the controlled synthetic method for the two specific phases of In₂O₃ that is carried out by adjusting the synthetic conditions. In this study, simple methods were reported for the production of InOOH and In(OH)₃ using hydrothermal reactions in aqueous solutions containing InCl₃, ethylenediamine (EDA), and N,N,N',N'-tetra-ethylethylenediamine (TEEDA). The selective formation of InOOH or In(OH)₃ was controlled by varying the amount of water. h-In₂O₃ and c-In₂O₃ were also selectively synthesized through the thermal oxidation of the InOOH and In(OH)₃ products, respectively as precursors. The photocatalytic properties of the h-In₂O₃ and c-In₂O₃ products that were fabricated this work were also examined

[en] We have developed a simple method for tuning the morphologies of Cu_2O microcrystals. Cu_2O microcrystals were prepared by precipitation at room temperature from a mixture of Cu(CH_3COO)_2·H_2O, N,N,N',N'- tetramethyl ethylenediamine (TMEDA), ascorbic acid, and polyethylene glycol (PEG). TMEDA was used to promote the formation of copper-TMEDA complexes. A variety of Cu_2O microcrystal morphologies were obtained simply by varying the concentrations of TMEDA and ascorbic acid. Aggregated Cu_2O microspheres are formed at higher concentrations of ascorbic acid in the absence of TMEDA. Aggregated Cu_2O microcubes are formed at lower concentrations of ascorbic acid and higher concentrations of TMEDA. The crystal growth mechanism of these Cu_2O morphologies is explained

[en] Sr_1_-_xCa_xS:Eu (x = 0, 0.2, 0.4, 0.6, 0.8, 1) phosphors were prepared from CaS, SrS, and EuS via a solid-state reaction in air. The cathodoluminescence (CL) spectra of the Sr_1_-_xCa_xS:Eu phosph ors for the moderate voltage ranging from 4 to 10 kV were obtained to test their usefulness in field emission displays (FEDs). The maximum wavelength of the CL spectra of the Sr_1_-_xCa_xS:Eu phosphors increases from 629 to 668 nm as the mole fraction of calcium increases up to x = 0.8, and then decreases to 663 nm at x = 1. The relationship between the CL spectra and crystal structures of the Sr_1_-_xCa_xS:Eu phosphors was determined.

[en] The module LEAPR of the NJOY data processing system has been improved to have the capability of computing the thermal elastic scattering cross sections for bismuth, which has a rhombohedral structure containing two atoms. The calculation formulas for thermal neutron elastic scattering by bismuth were introduced and incorporated into LEAPR, and than the scattering cross sections for bismuth were computed. The results were compared with the experimental data, and they were found to give a good agreement with the experimental data

[en] Basic concept of a cold neutron source for a 30 MW heavy water moderated reactor (HANARO) is developed. The source is a cold bottle located in a vertical hole near the reactor core. Since the bottle does not have sufficient volume for cooling, the optimum liquid mixture ratio is studied between liquid hydrogen and liquid deuterium. We also studied the variation of the gain depending on the volume of the bottle. The calculation is performed by a coupled MCNP model and by a semi-analytic approach. For the current geometry, 80 percent liquid deuterium mixture with liquid hydrogen gives the highest gain at 10 A neutron wave. (author)

[en] Zn_(_1_-_x_)Ga_2S_4:xEu (x = 0.03, 0.06, 0.09, 0.12, 0.15, 0.25, 0.50, 0.75, 1.0) phosphors were synthesized by performing a solid-state reaction. ZnGa_2S_4:Eu and EuGa_2S_4 crystal structures were confirmed by the XRD data. The photoluminescence (PL) spectra of the Zn_(_1_-_x_)Ga_2S_4:xEu phosphors were examined. Zn_(_1_-_x_)Ga_2S_4:xEu phosphor had a strong absorption near 465 nm, which was equal to the emission wavelength of the commercial blue-emitting diode. Zn_(_1_-_x_)Ga_2S_4:xEu phosphor produced a single emission band between 520 and 580 nm. The feasibility of Zn_(_1_-_x_)Ga_2S_4:xEu as a green-emitting phosphor pumped by the blue-emitting diode was investigated. A three-band white emission was obtained by coating a mixture of Zn_(_1_-_x_)Ga_2S_4:xEu and CaS:Eu phosphors onto the surface of a blue-emitting diode

[en] The nuclear reaction code EMPIRE has been extended to provide evaluation capabilities for neutron cross section covariances in the thermal, resolved resonance, unresolved resonance and fast neutron regions. The Atlas of Neutron Resonances by Mughabghab is used as a primary source of information on uncertainties at low energies. Care is taken to ensure consistency among the resonance parameter uncertainties and those for thermal cross sections. The resulting resonance parameter covariances are formatted in the ENDF-6 File 32. In the fast neutron range our methodology is based on model calculations with the code EMPIRE combined with experimental data through several available approaches. The model-based covariances can be obtained using deterministic (Kalman) or stochastic (Monte Carlo) propagation of model parameter uncertainties. We show that these two procedures yield comparable results. The Kalman filter and/or the generalized least square fitting procedures are employed to incorporate experimental information. We compare the two approaches analyzing results for the major reaction channels on ⁸⁹Y. We also discuss a long-standing issue of unreasonably low uncertainties and link it to the rigidity of the model

[en] The cabinet has an important role to protect the contained cables and digital modules for the safety function from the external electromagnetic (EM) source. Thus the immunity of an open cabinet against electromagnetic interference (EMI) numerically has been investigated using mode-matching method in. Another path for the external EM source to impinge on inner cables and digital modules is the bottom hole of the cabinet that is penetrated by various cables. Especially the EMI can detrimentally influence on the digital modules through annular space caused by sealing the bottom hole of the cabinet incompletely. Thus it is recently required that the electromagnetic interpretation in the annular hole is performed to remedy electromagnetic problems. Based on the mode-matching method, we solved the electrostatic boundary-value problem for holes penetrating shorted-cable at the bottom of a digital I and C cabinet. The Weber transform and the Hankel transform were applied to formulate the electrostatic potential. The capacitance and potential distribution generated near the penetrating shorted-cable were computed and compared with the result from the previous study