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CNguyen, B. V. C.*; 村上 健太*; Chena, L.*; Phongsakorn, P. T.*; Chen, X.*; 橋本 貴司; Hwang, T.*; 古澤 彰憲; 鈴木 達也*
Nuclear Materials and Energy (Internet), 39, p.101639_1 - 101639_9, 2024/06
In reactor pressure vessel materials, the formation of Mn- and Ni-rich nanoclusters is a major cause of neutron irradiation embrittlement. The segregation of these solute atoms into dislocation loops has attracted attention as a mechanism to accelerate solute clustering. In this study, the behaviors of solute Mn and Ni atoms in Fe-0.6wt.%Ni, Fe-1.4wt.%Mn, and Fe-1.4wt.%Mn-0.6wt.%Ni alloys irradiated at 400 C up to 3 dpa were analyzed using three-dimensional atom probe tomography. Solute atom clusters were observed in all materials, and their shapes were spherical, flat, and torus in FeNi, FeMn, and FeMnNi, respectively. In ternary alloy FeMnNi, Mn and Ni atoms were concentrated in the sample in the form of arcs, and the orientation of the plane containing the arcs was estimated by comparing field desorption images. The size, number density, and orientation of this structure were found to be in good agreement with those of both types of dislocation loops, namely, b = 1/2 
111
and b = 100, identified in a previous study using the same material. The positions of Ni and Mn enrichment did not fully overlap. Ni atoms tended to be concentrated more in the inner part of the loop than the Mn atoms. Mn atoms were enriched only in the vicinity of the dislocation loops, whereas Ni atoms showed a higher concentration inside the dislocation loops than in the bulk.
Zaiton, A.*; 大野 豊
JAEA-Review 2015-037, 120 Pages, 2016/03
JAEA-Review-2015-037.pdf:15.19MB
本報告書は、「放射線加工処理の分野における研究協力に関するマレーシア政府と日本原子力研究開発機構との間の実施取決め」に基づいて2002年12月から2012年12月にかけて国立研究開発法人日本原子力研究開発機構とマレーシア政府下の研究実施機関であるマレーシア原子力庁により実施された二国間研究協力についてまとめたものである。この間に実施された2つのイオンビーム育種分野における研究プログラム「イオンビームによるランの突然変異誘発」(2002年12月
2007年12月)及び「イオンビームによる新規観賞植物品種の作出」(2007年12月2012年12月)の研究活動に加え、付録としてそれぞれの研究プログラムに係わる運営員会の開催状況、イオンビーム照射実験の実施状況、論文・口頭発表リストについて収録した。
Zaiton, A.*; Shakinah, S.*; Affrida, A. H.*; Nur Akmal, M. R.*; Siti Mardhiah, M.*; 大野 豊
no journal, ,
In this study, the effects of ion beams on chrysanthemum flower colour traits of were examined through morphological and molecular analysis. Ray floret and nodal cultures of 
cv. Reagan Red were irradiated at different doses using ion beams irradiation facility at Japan Atomic Energy Agency (JAEA), Takasaki, Japan. Morphological screening on the regenerated mutant flowers has shown that 14 different primary colour types based on The Royal Horticulture Society Colour Chart were observed. Majority of the plants produced flowers with intense or lighter colour in the red group, and a few with orange and greyed-purple colour. Molecular analysis involving three genes in flavonoid biosynthesis pathway (CHS, DFR and F3H) showed that intragenic mutation involving base substitution, deletion and insertion has occurred in mutant plants. The highest mutation was observed in F3H, followed by CHS and DFR fragments with 20.5, 17.2 and 5.5% base mutation respectively.
Shakinah, S.*; Zaiton, A.*; Affrida, A. H.*; 大野 豊
no journal, ,
This study was conducted in an attempt to generate variations in chrysanthemum in view of producing new flower variety through radiation technology in combination with in vitro plant propagation techniques. Two physical mutagens (acute gamma and ion beam) were used to irradiated nodal and ray florets explants of chrysanthemum "Reagan Red". Surviving plantlets that derived from ray florets and nodal explants irradiated with acute gamma and ion beams were screened in a greenhouse at Malaysian Agricultural Research and Development Institute (MARDI), Cameron Highlands, Pahang. Results showed that three selected new varieties of chrysanthemum namely TIARA Red, Yellow Sun, and Golden Eye were successfully produced from ion beam irradiated ray florets explants and one variety from gamma irradiated nodal explants, namely Cream Marble. All of these new varieties are being maintained at Nuclear Malaysia and have been filed for Plant Variety Protection with the Department of Agriculture Malaysia.
