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김도성,이상환,도시홍 大邱大學校附設 基礎科學硏究所 1994 基礎科學硏究 Vol.11 No.-
In this study, the crystalline and scintillation characteristics of the BGO(Bi4Ge5O12) single crystal are investigated. The BGO single crystal is grown by Czochralski method at the pulling rate of 3---4mnVh, rotation rate of 20rpm and melting temperature of 1044`. It is shown that the crystal has been grown on the (I11) surface by XRD and etch-pit method. The gamma ray energy spectrum is measured by the BGO single ctystal attached to photomultiflier tube. The pulse height from the scintillation detector system using the BGO single crystal is linear to gamma ray energy and the energy resolution is typically 21.2% for Cs-137. The grown BGO single crystal may be useful in gamma ray detection and spectroscopy.
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Yoo, Jinkyoung,Hong, Young Joon,Jung, Hye Seong,Kim, Yong-Jin,Lee, Chul-Ho,Cho, Jeonghui,Doh, Yong-Joo,Dang, Le Si,Park, Kyung Ho,Yi, Gyu-Chul WILEY-VCH Verlag 2009 Advanced Functional Materials Vol.19 No.10
<P>The position-controlled growth and structural and optical characteristics of ZnO nanotubes and their coaxial heterostructures are reported. To control both the shape and position of ZnO nanotubes, hole-patterned SiO<SUB>2</SUB> growth-mask layers on Si(111) substrates with GaN/AlN intermediate layers using conventional lithography are prepared. ZnO nanotubes are grown only on the hole patterns at 600 °C by catalyst-free metal–organic vapor-phase epitaxy. Furthermore, the position-controlled nanotube growth method allows the fabrication of artificial arrays of ZnO-based coaxial nanotube single-quantum-well structures (SQWs) on Si substrates. In situ heteroepitaxial growth of ZnO and Zn<SUB>0.8</SUB>Mg<SUB>0.2</SUB>O layers along the circumference of the ZnO nanotube enable an artificial formation of quantum-well arrays in a designed fashion. The structural and optical characteristics of the ZnO nanotubes and SQW arrays are also investigated using synchrotron radiation X-ray diffractometry and photoluminescence and cathodoluminescence spectroscopy.</P> <B>Graphic Abstract</B> <P>Position-controlled ZnO nanotubes and their coaxial nanotube quantum structure arrays are fabricated by selective metal–organic vapor-phase epitaxy (see image). Both the position-controlled nanotube and associated coaxial heterostructures arrays exhibit excellent luminescent characteristics. This simple, precise, well-controlled “bottom-up” fabrication provides a general and rational route to integrate vertical nanodevices for nanometer-scale electronics and optoelectronics. <img src='wiley_img/1616301X-2009-19-10-ADFM200801123-content.gif' alt='wiley_img/1616301X-2009-19-10-ADFM200801123-content'> </P>
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울진원전 근해 해저 퇴적물의 구성성분 및 방사성 Cs 흡착 특성
김영규,김경미,정희진,강희동,김완,도시홍,김도성,Kim Yeongkyoo,Kim Kyung-Mi,Jung Hee-Jin,Kang Hee-Dong,Kim Wan,Doh Si-Hong,Kim Do-Sung 대한자원환경지질학회 2005 자원환경지질 Vol.38 No.6
울진원자력 발전소 인근 해역의 해저 퇴적물에 대하여 광물분석과 함께 $^{137}Cs$의 농도를 분석하였고 이와 더불어 총 유기탄소(total organic carbon, TOC)의 양과 퇴적물의 입자 크기를 분석하여 퇴적물의 특성과 더불어 이들의 상관관계에 대하여 알아보았다. 퇴적물의 입자 크기는 주로 모래크기에 해당되며 $-0.48\~3.6Md\phi$의 분포를 보인다. TOC와 $^{137}Cs$의 경우 각각 $0.06\~1.75\%$와 최소검출활동도(Minimum detectable activity, MDA)$\~4.0Bq/kg-dry$의 범위로 나타나며 평균 방사능의 농도는 $1.15{\pm}0.62Bq/kg-dry$였다. 일반적으로 다른 해역의 경우보다 큰 입자와 작은 TOC의 양과 $^{137}Cs$의 농도가 특징적이다. 본 해역 퇴적물의 구성 광물은 주로 석영과 장석류들(알바이트, 미사장석, 그리고 약간의 정장석)로 구성되어 있으며 미량의 휘석, 방해석, 각섬석 등의 조암광물들과 함께 $10{\AA}$의 피크를 갖는 광물(주로 흑운모)과 일부 녹니석등의 광물들이 혼재해 분포하고 있는 것으로 나타났다. 이들 광물 중 흑운모가 가장 대표적으로 $^{137}Cs$의 분포와 상관관계를 보이고 있으며 이는 흑운모의 풍화에 따른 닮은 모서리 자리(frayed edge site, FES) 나 시료에 혼재되어 존재할 가능성이 있는 일라이트 등에 의한 결과로 판단된다. 여러 가지 퇴적물의 특성 중 $^{137}Cs$의 분포와 가장 밀접한 양상을 보이는 것은 TOC의 농도로 이것은 본 해역에서 Cs을 강하게 흡착할 만한 광물이 존재하기 않기 때문이며, 따라서 $^{137}Cs$의 분포는 광물분포 보다는 TOC의 함량에 더 큰 영향을 받고 있음을 보여준다. Mineralogical composition, $^{137}Cs$ activity, total organic carbon (TOC), and particle size of marine sediments near Wuljin Nuclear Powerplant were analyzed and the relationships among those components were investigated. The particle sizes of sediments were equivalent to sand size and in the range of $-0.48\~3.6\;Md\phi$. TOC contents and $^{137}Cs$ activities were in the range of $0.06\~1.75\%$ and minimum detectable activity (MDA) $\~4.0Bq/kg-dry$ with the average value of $1.15{\pm}0.62$ Bq/kg-dry, respectively. The sediments in study area were characterized by large particle size and small TOC contents, and $^{137}Cs$ activity compared with other marine sediments. The main mineral components were quartz and feldspar (albite, microcline, and small amount of orthoclase) with small amount of pyroxene, calcite, hornblende. Minerals with $10{\AA}$ XRD peak (mainly biotite) and chlorite were also identified. Among those minerals, biotite shows the linear relationship with $^{137}Cs$ content probably due to the frayed edge site (FES) on biotite or small amount of mixed illite. However, TOC content shows most linear relationship with $^{137}Cs$ content because no significant amount of clay minerals, which can adsorb significant amount of Cs, were observed in the study area, indicating that the distribution of $^{137}Cs$ in this study area was more significantly affected by the TOC content than mineral composition.
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