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論文

Observation of Eu adsorption band in the CMPO/SiO$$_{2}$$-P column by neutron resonance absorption imaging

宮崎 康典; 渡部 創; 中村 雅弘; 柴田 淳広; 野村 和則; 甲斐 哲也; Parker, J. D.*

JPS Conference Proceedings (Internet), 33, p.011073_1 - 011073_7, 2021/03

中性子共鳴吸収イメージングを、抽出クロマトグラフィに使用するマイナーアクチノイド回収用CMPO/SiO$$_{2}$$-Pカラムで形成したEu吸着バンドの観測に適用した。軽水や重水で調製した湿潤カラムと乾燥吸着材を充填した乾燥カラムを比較し、中性子透過を評価した。中性子透過スペクトルから、乾燥カラムは45%、軽水調製カラムは20%、重水調製カラムは40%の中性子透過を確認した。得られた結果から、CMPO/SiO$$_{2}$$-Pカラムに形成したEu吸着バンドを観測するには、重水の使用によって、より鮮明になることを明らかにした。今後、カラム操作による吸着バンドのカラム内移行挙動を明らかにする。

論文

Visualization of the boron distribution in core material melting and relocation specimen by neutron energy resolving method

阿部 雄太; 土川 雄介; 甲斐 哲也; 松本 吉弘*; Parker, J. D.*; 篠原 武尚; 大石 佑治*; 加美山 隆*; 永江 勇二; 佐藤 一憲

JPS Conference Proceedings (Internet), 33, p.011075_1 - 011075_6, 2021/03

Since the hardness of fuel debris containing boride from B$$_{4}$$C pellet in control rod is estimated to be two times higher as that of oxide, such as UO$$_{2}$$ and ZrO$$_{2}$$, distribution of such boride in the fuel debris formed in the Fukushima-Daiichi Nuclear Power Plants may affect the process of debris cutting and removal. The high neutron absorption of boron may affect the possibility of re-criticality during the process of debris removal. Therefore, boride distribution in fuel debris is regarded as an important issue to be addressed. However, boron tends to have difficult in quantification with conventionally applied methods like EPMA and XPS. In this study, accelerator-driven neutron-imaging system was applied. Since boron is the material for neutron absorption, its sensitivity in terms of neutron penetration through specimens is concerned. To adjust neutron attenuation of a specimen to suit a particular measurement by selecting the neutron energy range, we focused on the energy resolved neutron imaging system RADEN, which utilizes wide energy range from meV to keV. Development of a method to visualize boron distribution using energy-resolved neutrons has been started. In this presentation the authors show the status of the development of a method utilizing energy-resolved neutrons and provide some outcome from its application to the Core Material Melting and Relocation (CMMR)-0 and -2 specimens.

論文

Feasibility study of PGAA for boride identification in simulated melted core materials

土川 雄介; 阿部 雄太; 大石 佑治*; 甲斐 哲也; 藤 暢輔; 瀬川 麻里子; 前田 亮; 木村 敦; 中村 詔司; 原田 正英; et al.

JPS Conference Proceedings (Internet), 33, p.011074_1 - 011074_6, 2021/03

福島原子力発電所の解体作業では、溶融した燃料棒に含まれるホウ素分布を事前に把握することが重要である。溶融燃料棒の模擬試験体を用意し、ホウ素やホウ化物の含有量を調査する研究が行われてきた。本研究では、その一環として中性子を用いたホウ素並びにホウ化物分布の測定技術開発を行った。ホウ素の中性子吸収に伴う即発ガンマ線を測定し、ホウ素量や二次元分布を測定した。また、n(B,$$alpha$$$$gamma$$)反応における478keV$$gamma$$線は、ホウ素の化合状態により、$$gamma$$線ピークの幅が変化することが知られている。このことを用い、特に溶融燃料棒周辺に存在することが予測されているZrBやFeBといったホウ化物の識別可能性について調査した。測定はJ-PARC/MLFのANNRI, NOBORU, RADENにて行った。これらの解析結果について報告する。

論文

Development of three-dimensional distribution visualization technology for boron using energy resolved neutron-imaging system (RADEN)

阿部 雄太; 土川 雄介; 甲斐 哲也; 松本 吉弘*; Parker, J. D.*; 篠原 武尚; 大石 佑治*; 加美山 隆*; 永江 勇二; 佐藤 一憲

Proceedings of 2020 International Conference on Nuclear Engineering (ICONE 2020) (Internet), 6 Pages, 2020/08

Boron carbide is used as a neutron-absorbing material in Fukushima-Daiichi Nuclear Power Station (1F), producing borides that are twice as hard as oxides (such as UO$$_{2}$$ and ZrO$$_{2}$$). The high neutron absorption of boron affects the evaluation of re-criticality during the process of debris retrieval. Therefore, it is important not only to determine the presence of boron but also to investigate the distribution of boron inside the material in a non-destructive manner during decommissioning. To address the uncertainties in the core material relocation behavior of boiling water reactor (BWR) during a severe accident (SA), solidified melt specimens of a simulated fuel assembly were prepared by plasma heating. If core material melting and relocation (CMMR) specimens can be used to estimate the B distribution in 1F Unit-3, that will provide valuable information in the decommissioning of 1F. To address this, the authors focused on the energy-resolved neutron imaging system, RADEN, which utilizes a wide energy range, from meV to keV. This is an innovative three-dimensional analysis technology for boride distribution that affects the evaluation of hardness and re-criticality. In the calibration standard samples (Zr$$_{x}$$B$$_{1-x}$$ and Fe$$_{x}$$B$$_{1-x}$$), there was a good correlation between boron concentration and the energy-dependence of the cross sections of cold and epi-thermal neutrons. In the CMMR specimens, boron distribution was confirmed from the contrast difference between cold and epi-thermal neutrons. In the future, the results of calibration standard samples will be applied to the results of CMMR specimens. With this method, three-dimensional boron distribution will be measured, and the understanding of boride distribution 1F Unit-3 will be improved, which may be reflected in an improved SA code.

論文

The Energy-resolved neutron imaging system, RADEN

篠原 武尚; 甲斐 哲也; 及川 健一; 中谷 健; 瀬川 麻里子; 廣井 孝介; Su, Y.; 大井 元貴; 原田 正英; 飯倉 寛; et al.

Review of Scientific Instruments, 91(4), p.043302_1 - 043302_20, 2020/04

 被引用回数:15 パーセンタイル:96.95(Instruments & Instrumentation)

The energy-resolved neutron imaging system, RADEN, has been installed at the pulsed neutron source in the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. In addition to conventional neutron radiography and tomography, RADEN, the world's first imaging beam-line at a pulsed neutron source, provides three main options for new, quantitative neutron imaging techniques: Bragg-edge imaging to visualize the spatial distribution of crystallographic information, resonance absorption imaging for elemental composition and temperature information, and polarized neutron imaging for magnetic field information. This paper describes the results of characterization studies of the neutronic performance and installed devices at RADEN and shows the results of several demonstration studies for pulsed neutron imaging.

論文

Neutron transmission spectrum of liquid lead bismuth eutectic

大場 洋次郎; 伊藤 大介*; 齊藤 泰司*; 小野寺 陽平*; Parker, J. D.*; 篠原 武尚; 及川 健一

Materials Research Proceedings, Vol.15, p.160 - 164, 2020/02

溶融鉛ビスマス(LBE)は加速器駆動システム(ADS)や高速炉等の冷却材として研究が進められている。近年、エネルギー分析型中性子イメージングが、配管内におけるLBEの解析に有効であることが報告された。しかしながら、従来の手法は、固相のブラッグ回折によって生じる透過率の減少であるブラッグエッジの解析にとどまっており、液相の解析は行われていなかった。液相の散乱によっても透過率の減少が生じるはずであり、この成分を観測して解析できれば、熱流動の主役である液相の情報を得て、これをマッピングすることができるようになる。そこで、溶融状態のLBEのエネルギー分析型中性子イメージング測定を行った。その結果、振動等を含む特徴的な透過率スペクトルを観測した。この特徴は、溶融LBEの散乱プロファイルから計算した透過率スペクトルと一致していることから、透過率スペクトルに液相の散乱が反映されていることが明らかになった。

論文

Feasibility study of two-dimensional neutron-resonance thermometry using molybdenum in 316 stainless-steel

甲斐 哲也; 廣井 孝介; Su, Y.; 瀬川 麻里子; 篠原 武尚; 松本 吉弘*; Parker, J. D.*; 林田 洋寿*; 及川 健一

Materials Research Proceedings, Vol.15, p.149 - 153, 2020/02

A two-dimensional thermometry technique based on neutron resonance reactions derives the temperature of specified elements in an object by analyzing the Doppler broadening of a neutron resonance measured by a time-analyzing neutron imaging-detector. This technique is expected to be one of the important applications of the energy-resolved neutron imaging system, RADEN, at J-PARC. The authors focused on molybdenum contained in 316 stainless-steel (with a weight fraction of 2-3 wt%). Energy-dependent transmitted neutrons were measured through a 3 mm thick 316 stainless-steel plate placed in a heater at temperatures between 23 and 500 degrees Celsius at RADEN using a gas-electron multiplier (GEM) detector. Thermal and cold neutrons were eliminated from the incident beam by a cadmium filter. The sample area within the neutron beam was 30 by 50 mm$$^2$$. The feasibility is discussed in the presentation.

論文

Recent progress on practical materials study by Bragg edge imaging at J-PARC

及川 健一; Su, Y.; 鬼柳 亮嗣; 川崎 卓郎; 篠原 武尚; 甲斐 哲也; 廣井 孝介; Harjo, S.; Parker, J. D.*; 松本 吉弘*; et al.

Physica B; Condensed Matter, 551, p.436 - 442, 2018/12

 被引用回数:1 パーセンタイル:8.26(Physics, Condensed Matter)

We are promoting for practical product observation by the energy-resolved neutron imaging method using high-intensity pulsed neutrons at J-PARC, under the Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan. Bragg edge imaging, one of the energy-resolved neutron imaging methods for visualizing material properties, was applied to feasibility study of the temperature distribution of copper rod, complementary study of the texture and strain distribution of bent steel plates using neutron diffraction and EBSD, and so on. Outline of results obtained by these imaging experiments will be presented.

論文

Study of the magnetization distribution in a grain-oriented magnetic steel using pulsed polarized neutron imaging

廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; Su, Y.; 及川 健一; 甲斐 哲也; 鬼柳 善明*

Physica B; Condensed Matter, 551, p.146 - 151, 2018/12

 被引用回数:2 パーセンタイル:16.65(Physics, Condensed Matter)

Grain oriented magnetic steel is widely used as a key material for magnetic industrial products. Since magnetic properties of steels are closely related to its magnetic domain structure, observation of the domain structure is important for understanding its magnetic properties. In this study, we attempted to observe the domain structure of a grain oriented steel using polarized pulsed neutron imaging. In the experiment, we first magnetized the sample by applying a magnetic field along the easy-to-magnetize direction via a coil, and confirmed the sample was magnetized almost uniformly from the obtained polarization distribution images. By analyzing the oscillatory behavior in the wavelength dependence of polarization, magnetization of the steel was estimated to be 1.82 T. Then, we removed the field and performed the same measurement. As a result, a striped domain structure was observed, with neighboring domains aligned anti-parallel to each other. From these results, it was demonstrated that our magnetic imaging method could visualize the magnetization and the direction of the domains in the practical steel.

論文

Characteristics of the 2012 model lithium-6 time-analyzer neutron detector (LiTA12) system as a high efficiency detector for resonance absorption imaging

甲斐 哲也; 佐藤 節夫*; 廣井 孝介; Su, Y.; 瀬川 麻里子; Parker, J. D.*; 松本 吉弘*; 林田 洋寿*; 篠原 武尚; 及川 健一; et al.

Physica B; Condensed Matter, 551, p.496 - 500, 2018/12

 被引用回数:1 パーセンタイル:8.26(Physics, Condensed Matter)

The 2012 model lithium-6 time-analyzer neutron detector (LiTA12) system, based on a lithium glass scintillator and multi-anode photomultiplier tube, has the highest neutron efficiency among the detectors for pulsed neutron imaging together with a flexibility of the efficiency by changing the thickness of the lithium glass. The authors expect this detector system could become a main detector system for the energy-resolved neutron imaging system, RADEN, at J-PARC, and have started evaluation of the LiTA12 system. For example, spatial resolution for resonance absorption imaging was evaluated by using a line-pair pattern made by 3 micro meter thick gold on a quartz plate. Less than 1 mm width line pairs were resolved at an 8 Mcps neutron counting rate and around 5 eV neutron energy.

論文

Effect of upstream beam collimation on neutron phase imaging with a Talbot-Lau interferometer at the RADEN beam line in J-PARC

關 義親; 篠原 武尚; 上野 若菜; Parker, J. D.*; 松本 吉弘*

Physica B; Condensed Matter, 551, p.512 - 516, 2018/12

 被引用回数:3 パーセンタイル:24.8(Physics, Condensed Matter)

3枚の格子からなる中性子タルボ・ロー干渉計は高機能なイメージング装置であり、通常の吸収コントラスト像に加えて、微分位相コントラスト像とビジビリティコントラスト像も同時に取得することができる。我々はJ-PARC MLF RADENビームラインにおいて波長分解型のタルボ・ロー干渉計の開発を進めている。干渉パターンの波長分解解析を行うことで、白色ビーム測定で生じていた色収差による系統誤差を排除するとともに、より定量的な情報を引き出すことが可能になる。この波長分解測定・解析法を前提として、RADENビームラインの波長スペクトルに最適化した干渉計の設計(中心波長・格子周期・格子間距離)を決定した。

論文

Spatial resolution test targets made of gadolinium and gold for conventional and resonance neutron imaging

瀬川 麻里子; 及川 健一; 甲斐 哲也; 篠原 武尚; 林田 洋寿*; 松本 吉弘*; Parker, J. D.*; 中谷 健; 廣井 孝介; Su, Y.; et al.

JPS Conference Proceedings (Internet), 22, p.011028_1 - 011028_8, 2018/11

We have fabricated and utilized spatial resolution test targets made of gadolinium and gold for conventional and resonance neutron imaging performed at RADEN, located at beam line BL22 of the J-PARC Materials and Life Science Experimental Facility (MLF). RADEN covers a broad energy range from cold neutrons to high-energy neutrons with energy of several tens keV and was designed to perform energy-resolved neutron imaging utilizing two-dimensional detectors combined with the accurate measurement of neutron energy by the time-of-flight method. The test targets were designed to verify the spatial resolution and image uniformity of two kinds of neutron detectors, counting-type detectors and camera-type detectors. In this presentation, we report the details of these two-dimensional test targets, and the results of demonstrations using the test targets with our neutron imaging detectors. This work was supported in part by the Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

論文

Development of a polarization analysis method for visualization of the magnetic field distribution in a small electric transformer using pulsed polarized neutron imaging

廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; 及川 健一; Su, Y.; 甲斐 哲也; 鬼柳 善明*

JPS Conference Proceedings (Internet), 22, p.011030_1 - 011030_7, 2018/11

We have been developing magnetic imaging method for industrial products using polarized pulsed neutrons. In this presentation, we report observation results of magnetic field distribution in a small electric transformer as a demonstration of our magnetic imaging method. The polarized pulsed neutron imaging experiment was performed at BL22 RADEN at MLF of J-PARC. 9 polarization distribution images were obtained with changing incident polarization and analyzing direction in 3D. By analyzing wavelength dependent polarization position by position, distribution of field strength and direction around the core of the transformer were successfully visualized. Obtained field distribution images were well corresponded with that expected by the simulation and clearly demonstrated a leaked field from the gap of step lap.

論文

Reliability estimation of neutron resonance thermometry using tantalum and tungsten

甲斐 哲也; 廣井 孝介; Su, Y.; 篠原 武尚; Parker, J. D.*; 松本 吉弘*; 林田 洋寿*; 瀬川 麻里子; 中谷 健; 及川 健一; et al.

Physics Procedia, 88, p.306 - 313, 2017/06

 被引用回数:3 パーセンタイル:88.78

Neutron resonance thermometry, which measures material temperature by analyzing the Doppler broadening of a neutron resonance peak, is one of the applications of energy-resolved neutron imaging at RADEN of J-PARC. Although this technique is promising, advantages and disadvantages have not been discussed in practical applications. The authors measured neutron transmission rates of tantalum and tungsten foils in a heater chamber up to 300 degrees Celsius at RADEN. The energy-dependent neutron transmission rates with different statistics were obtained after the measurements by selecting arbitrary measuring intervals from one measurement, and the temperatures of the foils were estimated from those transmission rates with different statistics. The reliability of the neutron resonance thermometry with statistical accuracy, irradiation time and spatial resolution are discussed.

論文

Time-of-flight neutron transmission imaging of martensite transformation in bent plates of a Fe-25Ni-0.4C alloy

Su, Y.; 及川 健一; 篠原 武尚; 甲斐 哲也; 廣井 孝介; Harjo, S.; 川崎 卓郎; Gong, W.; Zhang, S. Y.*; Parker, J. D.*; et al.

Physics Procedia, 88, p.42 - 49, 2017/06

 被引用回数:3 パーセンタイル:88.78

The influences of bending deformation and subsequent subzero treatment on the martensite transformation behaviors in a metastable austenitic alloy Fe-25Ni-0.4C were investigated by the time-of-flight (TOF) neutron Bragg-edge transmission (BET) imaging method. Two-dimensional (2D) maps of martensite phase volume fractions and texture variations due to residual stress and lowering the temperature of the bent samples before and after subzero treatment were obtained by Bragg-edge spectral analysis. The obtained phase volume fractions were quantitatively compared with those determined by neutron diffraction.

論文

Development of multi-colored neutron talbot-lau interferometer with absorption grating fabricated by imprinting method of metallic glass

關 義親; 篠原 武尚; Parker, J. D.*; 矢代 航*; 百生 敦*; 加藤 宏祐*; 加藤 秀実*; Sadeghilaridjani, M.*; 大竹 淑恵*; 鬼柳 善明*

Journal of the Physical Society of Japan, 86(4), p.044001_1 - 044001_5, 2017/03

 被引用回数:13 パーセンタイル:75.09(Physics, Multidisciplinary)

パルス中性子源において効率的な位相イメージングを行うために、複数波長で機能する多色Talbot-Lau干渉計を設計・開発した。J-PARC物質・生命科学実験施設のエネルギー分解型中性子イメージング装置「螺鈿」において、中心波長0.25, 0.50, 0.75nmそれぞれに由来する異なるビジビリティーのモアレ縞を同一セットアップで確認することで、その動作原理の実証を行った。さらに、入射波長の波長分解能を18%から50%まで変化させながら、モアレ縞のビジビリティーの減衰を測定し、高波長分解能が実現できるパルスビームの利点を示した。さらに、中心波長0.5nmを用いて、アルミニウム、鉛、銅のロッドをテストサンプルとしたイメージングも行い、吸収像に加えて、境界がエンハンスされた微分位相像、ビジビリティー像も取得することに成功した。この干渉計では、アナライザー用吸収格子の製作方法として、初めて金属ガラスのインプリント法を採用した。中心波長でのモアレ縞のコントラストは68%と良好であり、従来のガドリニウムの斜め蒸着法を用いた格子と比較すると、形状の精密なコントロールが可能である。

論文

A Comparative study of the crystallite size and the dislocation density of bent steel plates using Bragg-edge transmission imaging, TOF neutron diffraction and EBSD

及川 健一; Su, Y.; 友田 陽*; 川崎 卓郎; 篠原 武尚; 甲斐 哲也; 廣井 孝介; Zhang, S.*; Parker, J. D.*; 佐藤 博隆*; et al.

Physics Procedia, 88, p.34 - 41, 2017/00

 被引用回数:4 パーセンタイル:88.78

TOFブラッグエッジ透過イメージング法を用い、塑性変形させた曲げ鉄鋼試料の微細構造を解析し、得られた結果を中性子回折法及びEBSD法により比較検証を行った。その結果、テキスチャ等は非常に良い一致を示したが、結晶子サイズを中性子回折法による消衰効果から見積もることはうまく行かなかった。そこで、回折プロファイルのブロードニング幅解析から結晶子サイズを求めることを試み、またEBSD法から結晶歪みの解析結果も合わせて再検討を行った。

論文

Experimental evaluation of neutron absorption grating fabricated by oblique evaporation of gadolinium for phase imaging

關 義親; 篠原 武尚; 上野 若菜; Parker, J. D.*; 佐本 哲雄*; 矢代 航*; 百生 敦*

Physics Procedia, 88, p.217 - 223, 2017/00

 被引用回数:8 パーセンタイル:97.89

Talbot-Lau interferometry with three gratings is a powerful imaging method which produces a radiography image, a differential phase imaging, and a visibility contrast image at one measurement. We develop a new neutron Talbot-Lau interferometer at "RADEN" beam line on the Materials and Life Science Experimental Facility (MLF) in Japan Proton Accelerator Research Complex (J-PARC). Since the alignment condition of Talbot-Lau interferometer allows use of several wavelengths at the same setup of gratings, we can carry out wavelength-resolved phase contrast imaging with time-of-flight measurement. This method utilizes intensive beam of spallation neutron source with avoidance of chromatic aberration at the sample, and gives more detailed sample information depending on wavelength. We have successfully performed Talbot-Lau imaging for several types of metal rods with wavelengths of 2.5, 5.0 and 7.5 A.

論文

Time-of-flight neutron Bragg-edge transmission imaging of microstructures in bent steel plates

Su, Y.; 及川 健一; Harjo, S.; 篠原 武尚; 甲斐 哲也; 原田 正英; 廣井 孝介; Zhang, S.*; Parker, J. D.*; 佐藤 博隆*; et al.

Materials Science & Engineering A, 675, p.19 - 31, 2016/10

 被引用回数:16 パーセンタイル:72.33(Nanoscience & Nanotechnology)

Neutron Bragg-edge transmission imaging makes it possible to quantitatively visualize the two-dimensional distribution of microstructure within a sample. In order to examine its application to engineering products, time-of-flight Bragg-edge transmission imaging experiments using a pulsed neutron source were performed for plastically bent plates composed of a ferritic steel and a duplex stainless steel. The non-homogeneous microstructure distributions, such as texture, crystalline size, phase volume fraction and residual elastic strain, were evaluated for the cross sections of the bent plates. The obtained results were compared with those by neutron diffraction and electron back scatter diffraction, showing that the Bragg-edge transmission imaging is powerful for engineering use.

論文

Inner observation of canning Cadmium by energy-selective neutron imaging at NOBORU

原田 正英; Parker, J. D.*; 及川 健一; 甲斐 哲也; 篠原 武尚

JPS Conference Proceedings (Internet), 8, p.035002_1 - 035002_5, 2015/09

これまでの研究から、カドミウム(Cd)は、核破砕中性子源のポイズン材として適しているだけでなく、大強度中性子源において、少ない中性子強度減で、寿命を長くできる材質であることがわかった。したがって、JSNS/J-PARCの最初のモデレータのポイズン材として、Cdを使うことに決めた。JSNSの開発時期には、冷間等方圧加圧法(CIP)による、アルミニウム合金によるCd板の封入化が失敗し、アルミニウム合金が破損した。製造プロセスを見直すため、サンプルの内部を観察しなければならず、エネルギー選択中性子イメージング方法を適用することとした。JSNSのNOBORU(BL10)で、マイクロ・ピクセルガス二次元中性子検出器($$mu$$PIC)により、アルミニウム合金に内封されたCd板を測定した。その結果、いくつかのボイドが見つかった。

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