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小迫 和明*; 村田 徹*; 岩本 信之
Nuclear Physics and 
-ray sources for Nuclear Security and Nonproliferation, p.261 - 268, 2014/12
現在開発中のJENDL光核反応データファイルには吸収、粒子生成及び核種生成断面積並びに生成粒子のエネルギー・角度微分断面積が収納される予定である。これらの光核反応断面積データは核反応モデルコード(ALICE-F、CCONE)を利用して、巨大双極子共鳴に基づく光吸収断面積から計算された。入射光子エネルギーは粒子放出に対するしきいエネルギーから140MeVまでがカバーされており、本改訂では以下の3点に重点が置かれている。(1)リチウムからカルシウムまでの各同位体に対する核データを測定データを基に系統的に評価。(2)北海道大学で行われた鉄、銅及びタングステンに対する光中性子生成に関する測定データを利用して光核反応核データを評価し、核種生成データを検証。(3)幅広い応用分野での利用が可能となるように収納核種数を増加。この結果、本ファイルには181核種が収納される予定である。
-ray nondestructive detection and assay systems for nuclear safeguards and security at JAEA羽島 良一
Nuclear Physics and -ray sources for Nuclear Security and Nonproliferation, p.25 - 31, 2014/12
In JAEA, we are developing technologies relevant to the -ray non-destructive assay, which include a high-brightness -ray source based on modern laser and accelerator technologies, a Monte Carlo simulation code to deal with nuclear resonance fluorescence, and -ray measurement techniques optimized for highly radioactive samples. In this presentation, status of the above R&D is described in detail.
-ray generation西森 信行; 永井 良治; 松葉 俊哉; 羽島 良一; 山本 将博*; 本田 洋介*; 宮島 司*; 内山 隆司*; 栗木 雅夫*
Nuclear Physics and -ray sources for Nuclear Security and Nonproliferation, p.321 - 326, 2014/12
The quantification of fissile materials such as uranium-235 and plutonium-239 in spent fuel assemblies requires isotope-specific identification. We propose the use of nuclear resonance fluorescence (NRF) to identify the isotopic composition of sample materials nondestructively. The proposed nondestructive isotope identification system requires a high-intensity mono-energetic -ray beam. Although a mono-energetic -ray beam can be generated using a conventional laser Compton scattering technique, the generation of a high-intensity -ray beam requires an electron beam of unprecedentedly high brightness, which can be generated with an advanced accelerator system known as the energy recovery linac (ERL). A technological challenge of the ERL system, which we have addressed, is the development of a high-brightness, high-current electron gun. Our current status of development and operational experience of our gun is presented.
Pu in spent and melted fuel using the nuclear resonance fluorescence integral resonance transmission methodAngell, C.; 早川 岳人; 静間 俊行; 羽島 良一; Quiter, B. J.*; Ludewigt, B. L.*; Karwowski, H.*; Rich, G.*
Nuclear Physics and -ray sources for Nuclear Security and Nonproliferation, p.133 - 141, 2014/12
Non-destructive assay (NDA) of Pu in spent nuclear fuel is possible using the isotope-specific nuclear resonance fluorescence (NRF) integral resonance transmission (IRT) method. The IRT method measures the absorption of photons from a quasi-monoenergetic -ray beam due to all resonances in the energy width of the beam. According to calculations the IRT method could greatly improve assay times for Pu in nuclear fuel. To demonstrate and verify the IRT method, we first measured the IRT signature in 
Ta, and subsequently made IRT measurements in Pu. These measurements were done using the quasi-monoenergetic beam at the High Intensity -ray Source (HIS) in Durham, NC, USA. The IRT signature was observed as a decrease in scattering strength when the same isotope material was placed in the beam line upstream of the scattering target. The results confirm the validity of the IRT method in both Ta and Pu.
