Dissolution behaviors of ThO2(cr) and PuO2(cr) in synthetic groundwater were investigated at room temperature (23  2°C) under atmospheric conditions. The synthetic groundwater was prepared according to the chemical composition of the KURT-DB3 groundwater. The pH and Eh of the synthetic groundwater were pH 8.9 and 0.5 V, respectively, and the major components were Na, K, Ca, Mg, Si, Cl, SO4, F and HCO3 ions. A few mg of ThO2(cr) and PuO2(cr) powder were added in the synthetic groundwater and the concentrations of Th and Pu in supernatant were monitored for 5 months of reaction time. The concentrations of Th before and after ultracentrifugation were compared, while the solid-liquid phase separation of Pu samples could not be applied due to the small volume of sample solutions. The concentrations of Th and Pu were measured by ICP-MS and alpha spectrometry, respectively. Geochemist’s Work Bench (GWB, standard, 17.0) was applied for the modeling with ThermoChimie TDB v. 11a, which was updated with the latest NEA-TDB (vol. 14). Aqueous species distributions and solubility limiting solid phases of Th and Pu under the synthetic groundwater conditions were evaluated. The results of geochemical modeling indicate that aqueous Th-OH-CO3 ternary species and Pu(IV) species are dominant in solutions equilibrated with ThO2(s) and PuO2(am, hyd), respectively. The dissolution behaviors of ThO2(cr) and PuO2(cr) are comparable to the dissolution of ThO2(aged, logKsp = 8.5) and the oxidative dissolution of PuO2(am, hyd) in the presence of PuO2(coll, hyd), respectively.

레이저유도파열검출 기술을 이용하여 우라늄(VI) 가수분해물의 용해도를 측정하였다. 측정 용액의 우라늄 농도 범위는 , pH 범위는 , 그리고 이온 강도는 0.1 M 이며, 온도는 로 유지하였다. 문헌에 제시된 가수분해 상수와 specific ion interaction theory(SIT)를 이용하여 이온 강도 I=0 일 때의 용해도 곱 (solubility product) 상수 를 구하였다. 동일한 시료에 대해 흡수 및 형광 스펙트럼을 측정하여 가수분해 화학종의 존재를 확인하였다. 우라늄 농도에서 용액 중에 존재하는 주요 가수분해 화학종은 와 임을 보였다.

A new hybrid, Cymbidium(C.) ‘Sunny Bell’ was developed as new hybrid by National Institute of Horticultural & Herbal Science, Rural Development Administration, Suwon, Korea in 2013. This hybrid came from the progenies crossed between C. karan and ebruenum in 2000. Finally, one hundred-one seedlings were obtained after planting and acclimatization in green house. In 2007, one line was selected by their performance such as flower color, leaf shape, flower stalk, and vigorous growth and named ‘Wongyuo F1-47. The line code 000390-46 had uniformity and excellent characteristics. The selected line after second characteristics test was named as ‘Sunny Bell’. This hybrid had light purple colored petal and lip (RP59B)and large sized flower(diameter 7.9cm). A ‘Sunny Bell’ had about 7.8 flowers per flower stalk and small sized flower and plant. General impression of petals and sepals showed some incurved shape. The attitude of peduncle was erect. Bloom was started from February under optimal culture condition

A new hybrid, Cymbidium(C.) ‘Beauty smile’ was developed as new hybrid by National Institute of Horticultural & Herbal Science, Rural Development Administration, Suwon, Korea in 2013. This hybrid came from the progenies crossed between C. ‘2113’(Accession No.) and C. Lucky Rainbow ‘Randevous’ in 2000. Finally, eighty seven seedlings were obtained after planting and acclimatization in green house. In 2007, one line was selected by their performance such as flower color, leaf shape, flower stalk, and vigorous growth and named ‘Wongyuo F1-43. The line code 000550-78 had uniformity and excellent characteristics. The selected line after second characteristics test was named as ‘Beauty smile’. This hybrid had bright pink colored petal and lip (RP63D)and large sized flower(diameter 8.3cm). A ‘Beauty smile’ had about 13.3 flowers per flower stalk and medium sized flower and plant. General impression of petals and sepals showed some incurved shape. The attitude of peduncle was half-erect. Bloom was started from middle of November under optimal culture condition.