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Journal Articles

What is neutron-induced prompt gamma-ray analysis?

Osawa, Takahito

Hoshaka Bunseki, (34), p.34 - 50, 2023/04

This paper describes the nomenclature, principles, advantages and disadvantages of prompt gamma-ray analysis, the configuration of the PGA installed in JRR-3, what kind of analysis can be performed with the PGA, and how to use the PGA, respectively.

Journal Articles

Recent progress of $$^{135}$$Cs concentration and $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio measurement

Shimada, Asako

Bunseki Kagaku, 71(12), p.625 - 633, 2022/12

Cesium-135 is one of the important nuclides to assess the safe disposal of High Level Waste (HLW). Therefore, the calculation code and library to evaluate the $$^{135}$$Cs concentration in HLW have been improved through comparisons with experimental results. On the other hand, even basic data of $$^{135}$$Cs, such as its half-life, have large uncertainty. Because the $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio suggests its origin and introduction date, the ratios in environmental samples are measured to study global fallout from nuclear weapons testing and nuclear accidents. Such measurement methods was attracted attention, in particular, after the accident at the Fukushima Daiichi Nuclear Power Station. Measurement of the $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio in environmental samples was challenging because the radiocesium has a very low concentration and it co-exists with huge amounts of Ba isotopes, which are isobaric interfering nuclides, are co-exist. Chemical separation methods were developed to eliminate interfering nuclides and improve the performance of the mass spectrometer to enable the measurement of the ratios. In this review, the features of the $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio for each origin and recent developments in measurement techniques are summarized.

Journal Articles

Development and evaluation of XRF imaging instrument for moving objects

Fuchita, Tomoki*; Urata, Taisei*; Matsuyama, Tsugufumi*; Murakami, Masashi; Yoshida, Yukihiko; Ueda, Akihiko; Machida, Masahiko; Sasaki, Toshiki; Tsuji, Koichi*

X-sen Bunseki No Shimpo, 53, p.77 - 87, 2022/03

X-ray fluorescence (XRF) analysis is an analytical method to obtain elemental information by detecting fluorescence X-rays emitted from a sample irradiated with X-rays. It is possible to obtain two-dimensional elemental distribution images by scanning a sample with micro X-ray beam. In this study, we developed an XRF analytical instrument to rapidly obtain the elemental distributions for moving samples on a belt conveyor by applying the micro XRF technique. X-rays were widely irradiated to the belt conveyor. The elemental distributions were measured by scanning an X-ray detector, crossing above the belt conveyor. A collimator was attached to the top of the detector to limit the analyzing area. Both detection limit and spatial resolutions for moving directions of the detector and the belt conveyor were evaluated. Finally, it was demonstrated that the multi-elemental imaging was possible with the developed XRF instrument.

Journal Articles

Fundamental study for decorporation of plutonium by chelating agents; Coordination analyses of simulated plutonium with chelating agents by X-ray absorption spectroscopy

Uehara, Akihiro*; Shuhui, X.*; Sato, Ryotaro*; Matsumura, Daiju; Tsuji, Takuya; Yakumaru, Haruko*; Shiro, Ayumi*; Saito, Hiroyuki*; Tanaka, Izumi*; Ishihara, Hiroshi*; et al.

X-sen Bunseki No Shimpo, 53, p.223 - 229, 2022/03

no abstracts in English

Journal Articles

Quantitation of trace lanthanide and actinide ions in radioactive samples by capillary electrophoresis-laser-induced fluorescence detection

Haraga, Tomoko; Saito, Shingo*

Bunseki Kagaku, 70(12), p.671 - 679, 2021/12

We developed highly sensitive capillary electrophoresis-laser-induced fluorescence detection methods for lanthanide (Ln) and actinide (An) ions with small sample volume and low emission of waste, by which the radiation risk can be minimized. Specifically, determination of Nd ion in spent nuclear fuel, effective separation between Am and Cm ion, and specific detection of UO$$_{2}$$$$^{2+}$$ in real radioactive samples were achieved by molecular design of fluorescence probes composed of an aminocarboxylate chelating moiety, a fluorophore and a spacer, and unique separation mode based on dynamic ternary complexation. We found that there are appropriate combination of probe and ternary complexation for detection and separation of each Ln and An ions. For example, acyclic and macrocyclic hexadentate is suitable for Ln$$^{3+}$$, Am$$^{3+}$$ and Cm$$^{3+}$$, and planer tetradentate with $$pi$$ electron system is specific for UO$$_{2}$$$$^{2+}$$, with ppt-sub ppt level detection.

Journal Articles

Progress of analytical chemistry through the experience of the Fukushima Daiichi Nuclear Power Plant Accident

Matsueda, Makoto; Takagai, Yoshitaka*

Bunseki, 2021(4), p.160 - 161, 2021/04

no abstracts in English

Journal Articles

Development of fluorescence XAFS imaging using pinhole camera

Tanida, Hajime; Okamoto, Yoshihiro

X-sen Bunseki No Shimpo, 52, p.69 - 80, 2021/03

In the two-dimensional imaging XAFS method using an X-ray CCD detector, a transmission method has been applied to heavy elements with absorption edges at relatively high energies. Although the transmission method requires the sample to be an optimal thickness, the high-energy X-rays have high transmission capability, and can be applied to relatively thick samples. In this study, we attempted to develop a fluorescence method for fast screening of transition metal elements with the low energy X-ray absorption edges and their valence distribution in the samples such as glass materials, which are difficult to make thin. In order to obtain XAFS spectra with high sensitivity and positional resolution, a direct imaging detector without a scintillator and a pinhole were used. The results were demonstrated with a highly brilliant synchrotron radiation undulator X-ray with variable incident energy.

Journal Articles

Proper methods for treatment and handling of real samples; Inland water

Mochizuki, Akihito

Bunseki, 2021(1), p.2 - 7, 2021/01

no abstracts in English

Journal Articles

Appreciate new century award

Shimada, Asako

Nihon Bunseki Kagakukai Kanto Shibu Nyusu, (31), p.7 - 8, 2021/00

I am very glad to win a prize, new century award of Kanto branch of The Japan Society for Analytical Chemistry. I deeply appreciate recommender and co-workers. The title of award was "Development of analytical method of difficult to measure nuclides in radioactive wastes", and especially development of analytical method for Am-242m, Mo-93, and I-129 was recognized. By measuring beta-ray of Am-242, which is progeny nuclide of Am-242m and having high intensity and shorter half-life, measuring time was shortened to approximately 1/20 compare to traditional method. Analyzed Mo-93 example was extremely few. When Mo-93 was analyzed via X-ray, Zr-93 and Nb-93m were the interfering nuclides, therefore, separation method of Mo from Zr and Nb was developed and the method was applied to the rubble sample collected at the Fukushima Daiichi Nuclear Power Station (FDNPS). Official method to measure I-129 in environmental samples were optimized to measure I-129 in the contaminated water collected at FDNPS.

Journal Articles

Improvement of adsorption performances of Sr adsorption fiber and investigation for realizing simple $$^{90}$$Sr analysis

Horita, Takuma; Asai, Shiho*; Konda, Miki; Matsueda, Makoto; Hanzawa, Yukiko; Kitatsuji, Yoshihiro

Bunseki Kagaku, 69(10/11), p.619 - 626, 2020/10

 Times Cited Count:0 Percentile:0(Chemistry, Analytical)

We have developed a Sr adsorption fiber for rapid analysis of $$^{90}$$Sr. The prepared Sr adsorption fiber has a Sr-extraction layer that densely retains a Sr-selective extractant, an 18-crown-6 ether derivative, on the fiber surface. Hydrophobic group-containing polymer chains embedded onto the surface of the fiber allow to form a hydrophobic phase, incorporating Sr-selective extractants. This unique surface structure provides high adsorption capacity, leading to rapid and highly efficient adsorption of Sr$$^{2+}$$. The adsorption capacity of the Sr adsorption fiber was 3 times higher than commercially available 18-crown-6 ether derivative-impregnated resin (Sr Resin). The equilibrium adsorption capacity of the Sr adsorption fiber was comparable to the Sr Resin. The retained $$^{90}$$Sr was finally determined by a GM counter. The total analysis time including the Sr adsorption and measurement was about 1 hour.

Journal Articles

On-site measurement of nuclear material by using the fast neutron direct interrogation method

Komeda, Masao

Bunseki, 2019(10), p.459 - 461, 2019/10

no abstracts in English

Journal Articles

Recent trend of the radionuclide analyses in bioassay

Tomita, Jumpei

Bunseki, 2019(3), p.112 - 113, 2019/03

no abstracts in English

Journal Articles

Effect of surface conditions of the filament used in thermal ionization mass spectrometry on an uranium isotopic measurement

Taguchi, Shigeo; Miyauchi, Hironari*; Horigome, Kazushi; Yamamoto, Masahiko; Kuno, Takehiko

Bunseki Kagaku, 67(11), p.681 - 686, 2018/11

In thermal ionization mass spectrometry, de-gassing is one of the important treatments to release impurities of filaments and to minimize the influence of background. In this work, the effect of the surface change in the tungsten filament induced by the conductively heating treatment on uranium isotopic ($$^{235}$$U/$$^{238}$$U) measurement has been investigated. It was found that the conductively heating treatment of the filament has the effect of smoothing the surface of the filament and also has the effect of improving the deposition of the sample on the filament surface. As a result of either these effects, the precision of uranium isotopic ($$^{235}$$U/$$^{238}$$U) measurement was improved.

Journal Articles

Trace analysis for nuclear non-proliferation and security

Esaka, Fumitaka

Bunseki, 2018(10), p.408 - 411, 2018/10

Recent development of analytical techniques for identification of particles containing nuclear materials, isotope ratio analysis of uranium and plutonium using mass spectrometry, and age determination is described in this paper. These techniques are successfully applied to the trace analysis for nuclear non-proliferation.

Journal Articles

Journal Articles

Development of separation technique for platinum group metals from radioactive liquid waste utilizing laser-induced particulate formation

Saeki, Morihisa*; Asai, Shiho; Oba, Hironori*

Bunseki, 2018(4), p.138 - 143, 2018/04

Platinum group metal (PGM) has attracted much attention in light of increasing demands in the industrial sector. A wide variety of techniques specialized for PGM separation, such as, solvent extraction, solid phase extraction, and molten salt electrolysis have been developed so far. Among such techniques, a newly developed separation technique based on laser-induced particulate formation can be a promising alternative to conventional ones. It enables non-contact and highly-selective separation with a simple operation. In this review, the research history and the basic mechanism of laser-induced particulate formation were outlined. Several applications were also mentioned, focusing on our latest research progress which achieved a world first quantitation of radioactive palladium in a spent nuclear fuel sample.

Journal Articles

Recovery of rare metals using nucleic acid bases and extractants immobilized by grafted polymer chains

Saito, Kyoichi*; Asai, Shiho

Bunseki Kagaku, 66(11), p.771 - 782, 2017/11

 Times Cited Count:1 Percentile:3.6(Chemistry, Analytical)

Recovery and purification of rare metals, which are essential ingredients for highly functional materials, generally comes with operational difficulty. In this study, we have developed polymer adsorbents specially designed for highly-efficient adsorption of rare metal ions and exhibited their practical adsorption performances. Radiation-induced graft polymerization, one of the effective modification techniques for polymers, was employed for preparing the proposed adsorbents. Among such adsorbents, a 6-nylon fiber with nucleic-acid base, adenine, on the surface of the fiber demonstrated specific adsorption of ruthenium and palladium ions. In addition, a 6-nylon fiber with an extractant HDEHP (bis (2-ethylhexyl) phophoric acid) that has high affinity for lanthanides, achieved higher separation speed than a commercially available HDEHP-impregnated resin.

Journal Articles

New liquid-liquid extraction apparatus; "Emulsion-flow" extractor

Naganawa, Hirochika

Bunseki Kagaku, 66(11), p.797 - 808, 2017/11


 Times Cited Count:6 Percentile:23.61(Chemistry, Analytical)

A new liquid-liquid extraction method, called the emulsion-flow method, has recently been developed at Japan Atomic Energy Agency (JAEA). The emulsion-flow method, where low cost, simplicity, high efficiency, compactness, safety, and eco-friendly go together, has attracted attention, and has been expected to bring innovation to liquid-liquid extraction technologies. Compared with conventional industrial apparatuses, an emulsion-flow apparatus successfully combines the lowest cost superior to a spray column and the highest performance (the highest efficiency and the highest processing speed) comparable to a centrifugal extractor. Furthermore, the emulsion-flow method can also be used for collecting particulate components by utilizing their aggregation onto a liquid-liquid interface and for purifying water polluted by oil with its remarkable phase-separating ability.

Journal Articles

Non-contact and selective Pd separation based on laser-induced photoreduction for determination of $$^{107}$$Pd by ICP-MS; The Relation between separation conditions and Pd recovery

Yomogida, Takumi; Asai, Shiho; Saeki, Morihisa*; Hanzawa, Yukiko; Horita, Takuma; Esaka, Fumitaka; Oba, Hironori*; Kitatsuji, Yoshihiro

Bunseki Kagaku, 66(9), p.647 - 652, 2017/09

 Times Cited Count:2 Percentile:7.21(Chemistry, Analytical)

Palladium-107 is a long-lived fission product, which can be found in high-level radioactive liquid wastes (HLLW). Determination of the $$^{107}$$Pd contents in HLLW is essential to evaluate the long-term safety of HLLW repositories. However, the $$^{107}$$Pd content in HLLW has not been reported because of difficulties in pretreatment for the measurement. In this study, we investigated applicability of laser-induced photoreduction to HLLW solution: it enables a simple and non-contact separation of Pd. The results showed the recovery of 60% was achieved at the conditions: 40% ethanol, 20 min irradiation, 100 mJ of pulse energy. Additionally, major radionuclides and potentially interfering components in ICP-MS were removed from the simulated HLLW over a wide concentration range of Pd from 0.24 to 24 mg L$$^{-1}$$, showing the applicability of the proposed separation technique to HLLW samples.

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