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O/HO vapor generator for contrast-variation neutron scatteringArima-Osonoi, Hiroshi*; Takata, Shinichi; Kasai, Satoshi*; Ouchi, Keiichi*; Morikawa, Toshiaki*; Miyata, Noboru*; Miyazaki, Tsukasa*; Aoki, Hiroyuki; Iwase, Hiroki*; Hiroi, Kosuke; et al.
Journal of Applied Crystallography, 56(6), p.1802 - 1812, 2023/12
Times Cited Count：6 Percentile：79.25(Chemistry, Multidisciplinary)Sakasai, Kaoru; Sato, Setsuo*; Seya, Tomohiro*; Nakamura, Tatsuya; To, Kentaro; Yamagishi, Hideshi*; Soyama, Kazuhiko; Yamazaki, Dai; Maruyama, Ryuji; Oku, Takayuki; et al.
Quantum Beam Science (Internet), 1(2), p.10_1 - 10_35, 2017/09
Neutron devices such as neutron detectors, optical devices including supermirror devices and 
He neutron spin filters, and choppers are successfully developed and installed at the Materials Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC), Tokai, Japan. Four software components of MLF computational environment, instrument control, data acquisition, data analysis, and a database, have been developed and equipped at MLF. MLF also provides a wide variety of sample environment options including high and low temperatures, high magnetic fields, and high pressures. This paper describes the current status of neutron devices, computational and sample environments at MLF.
Iyatomi, Yosuke; Hoshina, Hiroyuki; Seko, Noriaki; Shimada, Akiomi; Ogata, Nobuhisa; Sugihara, Kozo; Kasai, Noboru; Ueki, Yuji; Tamada, Masao
JAEA-Technology 2010-045, 10 Pages, 2011/02
JAEA-Technology-2010-045.pdf:1.16MB
The concentrations of fluorine (7.2-10 mg/L) and boron (0.8-1.5 mg/L) dissolved in groundwater pumped from the shafts during excavation of the Mizunami Underground Research Laboratory (MIU), Tono Geoscience Centre, must be reduced to the levels below the environmental standards for fluorine: 0.8mg/L and boron: 1 mg/L. As well, collaborative research on groundwater treatment to remove fluorine and boron started in 2006 between the Environmental and Industrial Materials Research Division, Quantum Beam Science Directorate and the Tono Geoscientific Research Unit, Geological Isolation Research and Development Directorate. This is because the Quantum Beam Science Directorate has synthesized fibrous adsorbents with radiation-induced graft polymerization and applied adsorbents to collect rare metals dissolved in hot springs and sea water. The results of previous testing indicate that the adsorbent was able to remove more than 95% of the boron and fluorine and that performance of adsorbent for boron removal was better than the performance using ion-exchange resin. It was also apparent that the pH of groundwater had an influence on the performance of the adsorbent with respect to boron removal. Therefore we reran the recycling test using groundwater from the neutralization tank at the groundwater treatment facility. The results indicated that the performance of the adsorbent using neutral groundwater for boron removal was higher than using uncontrolled groundwater. However the bed volume (BV) with recycled adsorbent decreased compared to first use. It is thought that sulfur added at the groundwater treatment facility was retained by the adsorbent despite elution, and affected the performance such that repeat usage resulted in decreased efficiency. In addition, it is considered that the goals established in the first year compared to the results obtained to date, including the status of waste water treatment at the MIU, and summarized the results in this development.
Iyatomi, Yosuke; Hoshina, Hiroyuki; Seko, Noriaki; Kasai, Noboru; Ueki, Yuji; Tamada, Masao
Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.485 - 490, 2010/10
Iyatomi, Yosuke; Hoshina, Hiroyuki; Seko, Noriaki; Shimada, Akiomi; Ogata, Nobuhisa; Sugihara, Kozo; Kasai, Noboru; Ueki, Yuji; Tamada, Masao
Nihon Genshiryoku Gakkai Wabun Rombunshi, 9(3), p.330 - 338, 2010/09
The Mizunami Underground Research Laboratory (MIU) Project is a research project investigating the deep underground environment within crystalline rock being conducted by JAEA. The concentrations of fluorine and boron dissolved in groundwater pumped from shafts during excavation of geoscientific studies at MIU, are reduced to the levels below the environmental standards at a water treatment facility. Coagulation treatment and ion exchange treatment are applied for fluorine and boron respectively. So we have started to research on efficient groundwater treatment for fluorine and boron using radiation-induced graft polymerization adsorbent. Regarding the treatment for boron, the processing that about 12 times were faster than the general ion exchange resin was possible and the use of the adsorbent was possible repeatedly. In addition, it developed that the pH of the underground water gave adsorption performance of adsorbent influence. With respect to fluorine removal, fluorine adsorption more than 90% was able to confirm by the adsorbent, but low value in comparison with boron. As the reason, a difference of the concentration of fluorine and boron in groundwater is thought about. It is necessary to grasp the concentration which adsorption performance can show enough.
Takigami, Machiko*; Nagasawa, Naotsugu; Hiroki, Akihiro; Kasai, Noboru; Yoshii, Fumio; Tamada, Masao; Takigami, Shoji*; Shibata, Takuya*; Aketagawa, Yasushi*; Ozaki, Masuo*
Transactions of the Materials Research Society of Japan, 35(3), p.647 - 650, 2010/09
There are many livestock farmers in Gunma Prefecture. Many of the farms are located under Mt. Akagi and Haruna, which attract tourists. Furthermore, rivers around the mountains are source of water supply to metropolitan area. Therefore, the waste treatments are very important. Regulations of smell and COD (chemical oxygen demand) are severe in Gunma Prefecture. Although there is no regulation for color of drain water, color in secondary treated water from livestock urine waste has been one of the major concerns for livestock farmers. The color is a metabolite of microorganisms and not easy to be removed. People have tried to remove the color by ozone treatment, absorption using activated carbon or soils. An absorbent was prepared by radiation grafting; fibers were irradiated with 
Co 
-rays and some kinds of monomers were grafted onto the fibers. The absorbent thus prepared were used to decolorize the secondary treated water. The color and COD were removed by the absorbent, however, COD removal was more difficult than decolorization. Degree of grafting (weight increase expressed in % by grafting reaction to initial weight of the fiber), treated water/absorbent ratio, flow rate of treated water, and direction of flow affected color and COD removal. The used absorbent could be used repeatedly after washing.
Seko, Noriaki; Hoshina, Hiroyuki; Kasai, Noboru; Ueki, Yuji; Tamada, Masao; Kiryu, Toshiyuki*; Tanaka, Kazuya*; Takahashi, Makikatsu*
Nihon Ion Kokan Gakkai-Shi, 21(3), p.117 - 122, 2010/07
Iyatomi, Yosuke; Shimada, Akiomi; Ogata, Nobuhisa; Sugihara, Kozo; Seko, Noriaki; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji; Tamada, Masao
JAEA-Technology 2009-054, 10 Pages, 2009/11
JAEA-Technology-2009-054.pdf:0.86MB
The concentrations of fluorine and boron dissolved in groundwater pumped from shafts during excavation at the Mizunami Underground Research Laboratory (MIU), Tono Geoscience Centre, are reduced to the levels below the environmental standards at a water treatment facility. Collaborative research on groundwater treatment for fluorine and boron has been started by the Environment and Industrial Materials Research Division, Quantum Beam Science Directorate and the Tono Geoscientific Research Unit, Geological Isolation Research and Development Directorate. This is because the Quantum Beam Science Directorate in JAEA has synthesized fibrous adsorbents with radiation-induced graft polymerization and applied them to collect rare metals dissolved in hot springs and sea water. Boron adsorbent synthesized by grafting showed higher removal rate than that of the ion-exchange resin. Additionally, the durability and the repetition use of the boron adsorbent were evaluated to estimate the performance of boron adsorption. Therefore we produced the test equipment to do scale-up test of the adsorbent. Effect of flow rate and the repetition use on the adsorption performance of boron was investigated. As a result, it concluded that adsorption performance did not change even when the flow rate increased from SV 50h
to SV 100h. In addition, enough durability was confirmed for the repetition use of the adsorbent. The adsorption performance of the adsorbent was affected by pH of the groundwater especially in alkaline region.
Takigami, Machiko*; Amada, Haruyo*; Nagasawa, Naotsugu; Hiroki, Akihiro; Kasai, Noboru; Yoshii, Fumio; Tamada, Masao
Transactions of the Materials Research Society of Japan, 33(4), p.849 - 852, 2008/12
Shortage of phosphorus becomes a serious problem in the world. The removal of phosphorus in swine urine is a big concern for the environmental conservation. To solve both problems, absorbent to absorb phosphorus in swine urine was developed using carboxymethyl cellulose (CMC) and Iron. The gel formation proceeded instantaneously when CMC and Iron (III) chloride were mixed, while gel was not formed immediately when Iron (II) chloride was used. Oxidation of Iron (II) to Iron (III) occurs gradually in Iron (II) aqueous solution. However, addition of CMC to the Iron (II) solution promoted the oxidation to form gel. The rate of gel formation could be controlled by addition of acid to CMC-Iron (II) mixture. The resultant gel absorbed phosphorus in swine urine. The absorption was about 97% in swine urine containing 78 mg/L of phosphorus.
Takigami, Machiko*; Amada, Haruyo*; Nagasawa, Naotsugu; Hiroki, Akihiro; Kasai, Noboru; Yoshii, Fumio; Tamada, Masao
JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 44, 2008/11
no abstracts in English
Miyo, Yasuhiko; Yagyu, Junichi; Nishiyama, Tomokazu; Honda, Masao; Ichige, Hisashi; Kaminaga, Atsushi; Sasajima, Tadayuki; Arai, Takashi; Sakasai, Akira
Fusion Engineering and Design, 83(2-3), p.337 - 340, 2008/04
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)no abstracts in English
Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 45, 2007/02
Recovery cost of uranium from seawater was estimated on the conditions of annual 1200 ton-scale recovery and 2g-U/kg-adsorbent (hereafter ad) for adsorbent performance after 60 days soaking in seawater. The adsorbent was supposed to be used for 6 times and the six cycles of soaking were carried out annually. In these conditions, the uranium cost was estimated at 88 thousands yen/kg-U. If the repeatability of adsorbent increased up to 18 times, the cost became 48 thousands yen/kg-U. Further increment to 60 times reduced the cost to 34 thousands yen/kg-U. In the marine experiment at Okinawa, 3g-U/kg-ad of uranium adsorption was obtained by dipping an adsorbent chip into seawater for 30 days. This capacity supposed to be extended for 4g-U/kg-ad for 60 days soaking. This adsorption capacity can lead the cost of 25 thousands yen/kg-U at 18 times usage. In this case, initial investment is 108 billions yen which is one third of the construction cost of one million-kW nuclear plant.
Kasai, Noboru; Seko, Noriaki; Tamada, Masao; Ichikawa, Eiichi*
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 46, 2007/02
no abstracts in English
Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 5(4), p.358 - 363, 2006/12
Uranium cost in the annual collection of 1200 t-U from seawater was evaluated by using the recovery system of braid type adsorbents synthesized by radiation-induced graft polymerization. The total cost was calculated by summating those in the processes of adsorbent production, uranium recovery, and elution & purification. When the adsorbent performance increased from 2g-U/kg-adsorbent(ad) to 6 g-U/kg-ad, the cost of each process decreased in the same way. The increment of adsorbent durability of 6 times to 60 times reduced the process cost of adsorbent production especially. In the current state of 2 g-U/kg-ad and 6 times usage of adsorbent, the uranium from seawater cost 90 thousands yen/kg-U. The uranium cost becomes 2.5 thousands yen/kg-U in the promising performance of 4 g-U/kg-ad and 18 times usage of adsorbent.
Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*; Tamada, Masao
Nihon Kaisui Gakkai-Shi, 59(5), p.316 - 319, 2005/10
Braid adsorbent having functional group of amidoxime is a promising material for the recovery of uranium dissolved in the seawater. This long braid adsorbent was made by polyethylene multi-fibers in which amidoxime groups were introduced by radiation-induced graft polymerization and subsequent chemical treatment. The braid adsorbent obtained was moored at the offing of Okinawa Island. The average U adsorption of the adsorbent became 1.5 g-U/kg-adsorbent for 30 d soaking. The mooring system for braid adsorbent has possibility which reduced the cost for the recovery of uranium from seawater. Annual product of 1200 tons of uranium needs 134 km
of mooring area. In addition, there is 6000 km and more of suitable sea area for the collection of the uranium in the regions from Okinawa Islands to Tosa Bay in Japan.
Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*
FAPIG, (169), p.3 - 12, 2005/03
Braid adsorbent having functional group of amidoxime is a promising material for the recovery of uranium dissolved in the seawater. This braid adsorbent was made by polyethylene multi-fibers in which amidoxime groups were introduced by radiation-induced graft polymerization and subsequent chemical treatment. Reaction time for graft polymerization was 5 h and the resulted braid adsorbent had 2.8 mmol/g-adsorbent of amidoxime group. The braid adsorbent obtained was moored at the offing of Okinawa Island. The adsorption of uranium reached 1.5g/kg-adsorbent for 30 d soaking. The mooring system for braid adsorbent has possibility which reduced the cost for the recovery of uranium from seawater. It is shown that 134 km of mooring area is needed for annual product of 1200 tons of uranium. In addition, there is 6000 km and more of suitable sea area for the collection of the uranium in the regions from Okinawa Islands to Tosa Bay in Japan.
Seko, Noriaki; Kasai, Noboru; Tamada, Masao; Hasegawa, Shin; Katakai, Akio; Sugo, Takanobu*
JAERI-Tech 2004-076, 78 Pages, 2005/01
JAERI-Tech-2004-076.pdf:17.11MB
In September 1999, we have soaked 200 kg of fibrous amidoxime adsorbents, synthesized by radiation-induced graft polymerization, into seawater to evaluate their performance. Fractional elution facility was set effectively to elute the rare metals on adsorbents in Mutsu-Establishment. This facility consists of two parts of pre-washing and elution. The present report dealt with planning, manufacture and setting of fractional facility. Marine organism and slime on adsorbent cassette (290
290160 mm) were washed out and every 72 cassettes were set in elution unit (12101210H1460 mm) with nonwoven materials as a packing to avoid elution loss. In the elution process alkaline and alkaline earth metals were eluted with low concentration hydrochloric acid (0.01M) and rare metals were eluted with high concentration (0.5M) after the packing of elution unit into fractional elution facility.
Seko, Noriaki; Takeda, Hayato*; Kasai, Noboru; Tamada, Masao; Hasegawa, Shin; Katakai, Akio; Sugo, Takanobu*
JAERI-Tech 2004-075, 51 Pages, 2005/01
Fibrous adsorbent which is synthesized by radiation induced graft polymerization on the trunk polymers such as polymer nonwoven fabrics and woven cloths exhibits an excellent selective adsorption against heavy metal ions and toxic gases at extremely low concentrations. Two equipments were installed to synthesize the metal-ion and gas adsorbents by means of the radiation-induced graft polymerization in the liquid phase and the dipping, respectively. In the reaction chamber of the liquid phase reactor, the oxygen decreased to 100ppm. The inside temperature raised to 80
C. These characteristics satisfied the specification. The fabric transport can regulate the rate in the range from 1 to 10m/min. The reactor for the dip grafting could reduce the inside oxygen to 100ppm and inside temperature could reach to 80 C. The grafting of GMA was carried out as a characteristic test. The degree of grafting was controlled in the range from 40 to 70%.
Nakamura, Tatsuya; Masaoka, Sei; Yamagishi, Hideshi; Sakasai, Kaoru; Soyama, Kazuhiko; Aizawa, Kazuya
IEEE Transactions on Nuclear Science, 51(4), p.1519 - 1523, 2004/08
Times Cited Count：2 Percentile：18.18(Engineering, Electrical & Electronic)A capillary plate (CP) comprising an assembly of fine glass tubes was applied as a pre-gas-amplification device for a microstrip gas chamber (MSGC) operating under high-gas pressure of helium-3 for use in neutron detection. The collection efficiency of the electrons between the CP and MSGC was maximally 17% using neutrons. The effective gas gain of the detector system was 
600 at a gas pressure of 3 atm with a 10% mixture of ethane with helium-3, confirming the feasibility of the CP as a pre-gas-amplification device. Moreover, we demonstrated that the coincidence measurement of the signals between the CP and the anodes of MSGC decreased the background levels of electronics noise, electronic discharges, and -rays, indicating that a detector system with a low background can be constructed using the CP.
Ogawa, Hiroaki; Yamauchi, Yuji*; Tsuzuki, Kazuhiro; Kawashima, Hisato; Sato, Masayasu; Shinohara, Koji; Kamiya, Kensaku; Kasai, Satoshi; Kusama, Yoshinori; Yamaguchi, Kaoru*; et al.
Journal of Nuclear Materials, 329-333(Part1), p.678 - 682, 2004/08
Times Cited Count：4 Percentile：28.60(Materials Science, Multidisciplinary)no abstracts in English
