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RISS 인기검색어
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- 저자 : Go Okada (검색결과 3 건)
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Radio-photoluminescence observed in non-doped Mg2SiO4 single crystal
Go Okada,Takahiro Kojima,Jisaburo Ushizawa,Noriaki Kawaguchi,Takayuki Yanagida 한국물리학회 2017 Current Applied Physics Vol.17 No.3
The aim of this research is to investigate radiation-induced luminescence of non-doped Mg2SiO4 single crystal. The Mg2SiO4 single crystals were synthesized by the Czochralski process. The obtained crystal samples were studied to characterize the radio-photoluminescence (RPL), radio-luminescence (RL), and thermally-stimulated luminescence (TSL) properties. A non-irradiated (or as-prepared) sample shows no particular PL features whereas X-ray treated sample shows a broad PL emission around 630 nm under excitation at 270 nm. The latter observation indicates that RPL centre has been generated by X-ray irradiation. The X-ray induced RL can be observed due to the RPL centre around 630 nm, and the intensity monotonically increases with accumulating the incident radiation dose. TSL glow curve consists of three peaks at 160, 260, and 390 C, and the initial rise method derived the activation energies of 1.33, 1.47, and 1.85 eV, respectively. The first two TSL are associated with some shallow trapping centres, and annealing at this temperature range builds up the RPL response. On the other hand, annealing at higher temperatures supresses the RPL response; thus, the RPL centre is located at deeper site.
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X-ray induced effects in Sm3+-doped ZnO-P2O5 glass for radiation measurements
Go Okada,Hirokazu Masai,Aya Torimoto,Safa Kasap,Takayuki Yanagida 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
We have studied X-ray induced effects on ZnO-P2O5 glass doped with Sm3+ ion. The glass was synthesized by a conventionalmelt-quenching method in an ambient atmosphere. We have investigated the following three different effects induced by Xrayirradiation in this glass, which can be used for radiation sensing applications. First, although the as-prepared glass sampleis highly transparent and homogeneous, upon irradiation with X-rays, the sample becomes slightly brownish due to anappearance of color centers induced by X-ray irradiation which can be measured as an optical absorption in the UV-Vis range. By utilizing the extent of absorption change by X-ray irradiation, it is possible to measure the incident radiation dose fromabout 0.5 to over 20 Gy. Second, with the Sm3+ ion included as a luminescent centre, the glass sample emits orange-red lightupon X-ray irradiation. The integrated light emission is proportional to the incident X-ray dose, hence it can be used as ascintillator plate for online radiation monitoring. The confirmed exposure dose detection range for this use is approximately1 -300 R. Last, when an irradiated sample is heated at elevated temperatures from 100 to 400 oC, it shows a thermallystimulatedluminescence (TSL). The emission intensity increases with the accumulated X-ray dose delivered prior to themeasurement, so our sample has a function to act as a TSL dosimeter as well. Over the radiation dose range we have tested,the X-ray induced effects above show linear response against the incident dose. The linear response is of particular importancefor dosimetry applications since it enables us to calibrate the response of sample to radiation dose with high accuracy.
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Okada, Yukinori,Sim, Xueling,Go, Min Jin,Wu, Jer-Yuarn,Gu, Dongfeng,Takeuchi, Fumihiko,Takahashi, Atsushi,Maeda, Shiro,Tsunoda, Tatsuhiko,Chen, Peng,Lim, Su-Chi,Wong, Tien-Yin,Liu, Jianjun,Young, Terr Nature Publishing Group, a division of Macmillan P 2012 Nature genetics Vol.44 No.8
Chronic kidney disease (CKD), impairment of kidney function, is a serious public health problem, and the assessment of genetic factors influencing kidney function has substantial clinical relevance. Here, we report a meta-analysis of genome-wide association studies for kidney function??related traits, including 71,149 east Asian individuals from 18 studies in 11 population-, hospital- or family-based cohorts, conducted as part of the Asian Genetic Epidemiology Network (AGEN). Our meta-analysis identified 17 loci newly associated with kidney function??related traits, including the concentrations of blood urea nitrogen, uric acid and serum creatinine and estimated glomerular filtration rate based on serum creatinine levels (eGFRcrea) (P < 5.0 ? 10<SUP>??8</SUP>). We further examined these loci with in silico replication in individuals of European ancestry from the KidneyGen, CKDGen and GUGC consortia, including a combined total of ??10,347 individuals. We identify pleiotropic associations among these loci with kidney function??related traits and risk of CKD. These findings provide new insights into the genetics of kidney function.
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