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Photoluminescence and radioluminescence properties of (Gd8Ca2)(SiO4)6O2 crystals with different concentrations of Ce

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Journal of Rare Earths 2017年第11期35卷 1071-1076页

作者： Takuya Igashira Masaki Mori go okada Noriaki Kawaguchi Takayuki Yanagida Graduate School of Materials Science Nara Institute of Sdence and Technology (NAIST) 8916-5 Takayama Ikoma Nam Japan

(GdCa)(SiO)Oapatite crystals doped with different concentrations of Ce were synthesized by the Floating Zone(FZ) method, and we have evaluated the photoluminescence(PL) and radio luminescence(RL) properties. In PL, an emission band appeared around 400 nm under excitation at 300 nm due to the5 d-4 f transitions of Ce3+. The PL decay curves were approximated by a second-order exponential decay function, and the derived decay time constants ranged around 20-25 ns and 40-480 ns. Similar emission was observed in RL, but the decay time constants were much longer than those in PL. The RL afterglow was the lowest in the 1.0% Ce-doped sample. The 1.0% and 2.0% Ce-doped samples showed a full-energy peak in the pulse height spectrum measured underAm 5.5 MeV α-ray irradiation, and the absolute scintillation light yields were estimated to be around 55 and 36 ph/5.5 MeV-a, respectively.

关键词： Scintillator Apatite Ce^(3+) 5d-4f transition

Sm-doped CsBr crystal as a new radio-photoluminescence (RPL) material

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Journal of Rare Earths 2016年第8期34卷 769-773页

作者： go okada Yutaka Fujimoto Hironori Tanaka Safa Kasap Takayuki Yanagida Graduate School of Materials Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama Ikoma Nara 630-0192 Japan Department of Applied Chemistry Graduate School of Engineering Tohoku University 6-6-07 Aoba Aramaki Aoba-ku Sendai 980-8579 Japan Department of Electrical and Computer Engineering University of Saskatchewan 57 Campus Dr. Saskatoon SK S7N5A9 Canada

Radio-photoluminescence （RPL） is a phenomenon seen in luminescent materials in which the appearance of new photolu- minescence （PL） emission is induced by an incident ionizing radiation such as X-rays; and the signal is stable even after the irradia- tion and during the PL measurement. Since the induced PL intensity is proportional to the irradiation dose, the RPL can be used in ra- diation measurements. The distinct advantage of RPL over the conventional thermally- or photo-stimulated luminescence （abbrevi- ated as TSL or PSL） dosimeters is the stability of response signal. With an RPL detector, it allows us to readout the signal multiple time without signal fading. In this work, we discovered that CsBr：Sm showed an RPL phenomenon by X-ray irradiation, and we characterized this new material as an RPL detector. While the sample showed PL emissions mainly in the visible range, after an X-ray irradiation additional emissions could be observed in the red to near-infrared range around 650-850 nm and 900-1000 nm and longer. The RPL response was fairly stable overall, but very interestingly the 650-850 nm signal slightly increased while the 900-1000 nm decreased during PL readout. The dynamic range was confirmed over 1-104 mGy with linear response.

关键词： radio-photoluminescence RPL CsBr Sm dosimeter X-rays rare earths

Photoluminescence, scintillation and thermally-stimulated luminescence properties of Tb-doped 12CaO·7Al2O3 single crystals grown by FZ method

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Journal of Rare Earths 2017年第10期35卷 957-963页

作者： Narumi Kumamoto Daisuke Nakauchi Takumi Kato go okada Noriaki Kawaguchi Takayuki Yanagida Graduate School of Materials Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama-cho Ikoma-shi Nara 630-0192 Japan

Tb-doped 12CaO·7Al_2O_3（Tb：C12A7） crystals were synthesized by the floating zone（FZ） method and the photoluminescence（PL）, scintillation and thermally-stimulated luminescence（TSL） properties were investigated. The photoluminescence（PL） emission spectra and PL decay time profiles were investigated by using Quantaurus-tau（Hamamatsu）. The scintillation spectra and decay time profiles were measured by using our laboratory-constructed set-up under X-ray irradiation. Finally, TSL glow curve was measured by using Nanogray TL-2000 with the heating rate of 1 °C/s. In PL and scintillation, emission peaks were observed at 493, 543, 587 and 620 nm due to the 4f-4f transitions of Tb3~＋. Decay time constants of the emission by PL and scintillation appeared to be different, and the measured values were approximately 2.4 and 1.9 ms, respectively. After X-ray irradiations, the 0.5%（all Tb contents in this paper are in mole fraction） and 1.0% Tb-doped samples showed a single intense and broad glow peak around 100 oC while 1.2%–1.5% Tb-doped samples showed notable additional peak around 250 oC.

关键词： C12A7 single crystal FZ terbium scintillation photoluminescence TSL rare earths

Scintillation and optical properties of Ce-doped YAGG transparent ceramics

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Journal of Rare Earths 2016年第8期34卷 763-768页

作者： Masaki Mori Jian Xu go okada Takayuki Yanagida Jumpei Ueda Setsuhisa Tanabe Graduate School of Materials' Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama-cho Ikoma-shi Nara 630-0192 Japan Graduate School of Human and Environmental Studies Kyoto University Yoshida-nihonmatsu-eho Sakyo-ku Kyoto 606-8501 Japan

We investigated photoluminescence （PL） and scintillation properties of Ce3＋-doped Y3A12Ga3OI2 （Ce：YAGG） trans- parent ceramics synthesized by vacuum sintering with different Ce3＋ concentrations （mol.%） from 0.3% to 1% （0.3%Ce：YAGG, 0.5%Ce：YAGG, 0.8%Ce：YAGG and I%Ce：YAGG）. The samples were synthesized by the vacuum sintering technique. The obtained samples showed a very strong and broad PL emission by the 5dl-4f transition of Ce3＋ in the wavelength range from 470 to 600 nm. The PL decay profiles were approximated by a single exponential decay function with the time constants of around 33-39 ns, Fur- thermore, the scintillation spectra induced by X-rays showed similar features with those observed in PL. The scintillation decay time profiles followed a second-order exponential decay function. The fast component group （ranged 3542 ns） were dominantly contrib- uted by the 5d1-4f transition of Ce3＋. The pulse height spectra utilizing the latter emissions showed a clear photoabsorption peak. Among those samples tested, 0.5%Ce：YAGG sample showed the highest scintillation light yield of 21,400 ph/MeV under 13VCs y-ray irradiation.

关键词： YAGG cerium transparent ceramic scintillation photoluminescence rare earths

Solar power sail mission of OKEANOS

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Astrodynamics 2020年第3期4卷 233-248页

作者： Osamu Mori Jun Matsumoto Toshihiro Chujo Masanori Matsushita Hideki Kato Takanao Saiki Yuichi Tsuda Jun'ichiro Kawaguchi Fuyuto Terui Yuya Mimasu go Ono Naoko Ogawa Yuki Takao Yuki Kubo Kaoru Ohashi Ahmed Kiyoshi Sugihara Tatsuaki okada Takahiro Iwata Hajime Yano Japan Aerospace Exploration Agency Sagarmihara 252-5210Japan Tokyo Institute of Technology Tokyo 152-8550Japan The University of Tokyo Tokyo 113-8654Japan Patchedconics LLCSagarmihara 252-5210Japan

The solar power sail is an original Japanese concept in which electric power is generated by thin-film solar cells attached on the solar sail *** Aerospace Exploration Agency(JAXA)successfully demonstrated the world’s first solar power sail technology through IKAROS(Interplanetary Kite-craft Accelerated by Radiation of the Sun)mission in *** demonstrated photon propulsion and power generation using thin-film solar cells during its interplanetary *** up,solar power sails can generate enough power to drive high specific impulse ion thrusters in the outer planetary *** this concept,we propose a landing or sample return mission to directly explore a Jupiter Trojan asteroid using solar power sail-craft OKEANOS(Oversize Kite-craft for Exploration and AstroNautics in the Outer Solar System).After rendezvousing with a Trojan asteroid,a lander separates from OKEANOS to collect samples,and perform in-situ analyses in three proposed mission sequences,including sending samples back to *** paper proposes a system design for OKEANOS and includes analyses of the latest mission.

关键词： solar power sail Trojan asteroid landing in-situ analysis outer solar system OKEANOS

Hayabusa2’s station-keeping operation in the proximity of the asteroid Ryugu

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Astrodynamics 2020年第4期4卷 349-375页

作者： Yuto Takei Takanao Saiki Yukio Yamamoto Yuya Mimasu Hiroshi Takeuchi Hitoshi Ikeda Naoko Ogawa Fuyuto Terui go Ono Kent Yoshikawa Tadateru Takahashi Hirotaka Sawada Chikako Hirose Shota Kikuchi Atsushi Fuji Takahiro Iwata Satoru Nakazawa Masahiko Hayakawa Ryudo Tsukizaki Satoshi Tanaka Masanori Matsushita Osamu Mori Daiki Koda Takanobu Shimada Masanobu Ozaki Masanao Abe Satoshi Hosoda Tatsuaki okada Hajime Yano Takaaki Kato Seiji Yasuda Kota Matsushima Tetsuya Masuda Makoto Yoshikawa Yuichi Tsuda Japan Aerospace Exploration Agency Sagarmihara 252-5210Japan The Graduate University for Advanced Studies Sagarmihara 252-5210Japan NEC Aerospace Systems LtdFruchu 183-8502Japan NEC Corporation Puchu 183-8501Japan

The Japanese interplanetary probe Hayabusa2 was launched on December 3,2014 and the probe arrived at the vicinity of asteroid 162173 Ryugu on June 27,*** its 1.4 years of asteroid proximity phase,the probe successfully accomplished numbers of record-breaking achievements including two touchdowns and one artificial cratering experiment,which are highly expected to have secured surface and subsurface samples from the asteroid inside its sample container for the first time in *** Hayabusa2 spacecraft was designed not to orbit but to hover above the asteroid along the sub Earth *** orbital and geometrical configuration allows the spacecraft to utilize its high-gain antennas for telecommunication with the ground station on Earth while pointing its scientific observation and navigation sensors at the *** paper focuses on the regular station-keeping operation of Hayabusa2,which is called“home position”(HP)-keeping ***,together with the spacecraft design,an operation scheme called HP navigation(HPNAV),which includes a daily trajectory control and scientific observations as regular activities,is *** the description on the guidance,navigation,and control design as well as the framework of optical and radiometric navigation,the results of the HP-keeping operation including trajectory estimation and delta-V planning during the entire asteroid proximity phase are summarized and evaluated as a first ***,this paper states that the *** operation in the framework of HPNAV had succeeded without critical incidents,and the number of trajectory control delta-V was planned fficiently throughout the period.

关键词： small body mission station-keeping guidance,navigation,and control(GNC) optical and radiometric navigation

Effectiveness of rehabilitation based on recreational activities:A systematic review

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World Journal of Meta-Analysis 2013年第1期1卷 27-46页

作者： Hiroharu Kamioka Kiichiro Tsutani Minoru Yamada Hyuntae Park Hiroyasu Okuizumi Takuya Honda Shinpei okada Sang-Jun Park Jun Kitayuguchi Shuichi Handa Yoshiteru Mutoh Faculty of Regional Environment Science Tokyo University of Agriculture Tokyo 156-8502 Japan Department of Drug Policy and Management Graduate School of Pharmaceutical Sciences University of TokyoTokyo 113-0033 Japan Human Health Sciences Kyoto University Graduate School of Medicine Kyoto 606-8507 Japan Department of Functioning Activation National Center for Geriatrics and Gerontology Aichi 474-8511 Japan Mimaki Onsen(Spa) Clinic Nagano 389-0402 Japan Japan Society for Promotion of Science Kyoto 619-0288 Japan Physical Education and Medicine Research Foundation Nagano 389-0402 Japan Physical Education and Medicine Research Center Unnan Shimane 690-2404 Japan Research Institute of Nippon Sport Science University Tokyo 158-0081 Japan

AIM: To summarize the evidence from randomized controlled trials(RCTs) on the rehabilitation effects of recreational ***: Studies were eligible if they were RCTs. Studies included one treatment group in which recreational activity was applied. We searched the following databases from 1990 to May 31, 2012: MEDLINE via Pub Med, CINAHL, Web of Science, and Ichushi-Web. We also searched all Cochrane Databases and Campbell Systematic Reviews up to May 31, 2012. RESULTS: Eleven RCTs were identified, which included many kinds of target diseases and/or symptoms such as stroke, dementia, Parkinson's disease, acquired brain injury,chronic non-malignant pain, adolescent obesity, high-risk pregnancy, and the frail elderly. Various intervention methods included gaming technology, music, dance, easy rider wheelchair biking, leisure education programs, and leisure tasks. The RCTs conducted have been of relatively low quality. A meta-analysis(pooled sample; n = 44, two RCTs) for balance ability using tests such as "Berg Balance Scale" and "Timed Up and go Test" based on game intervention revealed no significant difference between interventions and controls. In all other interventions, there were one or more effects on psychological status, balance or motor function, and adherence as primary or secondary ***: There is a potential for recreational activities to improve rehabilitation-related outcomes, particularly in psychological status, balance or motor function, and adherence.

关键词： Recreation activities Randomized controlled trial Rehabilitation effect