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Journal Articles

Mutational effects of $$gamma$$-rays and carbon ion beams in ${it Arabidopsis}$ seedlings

Yoshihara, Ryohei*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei; Hidema, Jun*; Sakamoto, Ayako

Journal of Radiation Research, 54(6), p.1050 - 1056, 2013/05

 Times Cited Count:22 Percentile:64.49(Biology)

Journal Articles

Torsion test technique for interfacial shear evaluation of F82H RAFM HIP-joints

Nozawa, Takashi; Ogiwara, Hiroyuki*; Kannari, Jun*; Kishimoto, Hirotatsu*; Tanigawa, Hiroyasu

Fusion Engineering and Design, 86(9-11), p.2512 - 2516, 2011/10

 Times Cited Count:14 Percentile:71.64(Nuclear Science & Technology)

A hot isostatic press (HIP) process is a key technology to fabricate a first wall of the blanket system utilizing a reduced-activation ferritic/martensitic (RAFM) steel such as F82H. A primary objective of this study is to characterize interfacial properties of HIPed F82H joints by torsion to identify the feasibility of this test method. It is apparent that the absorption energies of the HIP joints varied by the processing conditions, although the maximum shear strength was not much different. According to the fracture surfaces, it is indicated that the reduction of the absorption energy was due to the oxide formed on the interface of the HIP joint and this was consistent with the results of charpy impact tests. In conclusion, the torsion test method enables to precisely evaluate the shear properties of the HIPed joint interface and becomes one of promising powerful techniques for inspection of the HIP joints.

Journal Articles

Production of soybean mutants with pale-green-leaf phenotype by ion beam irradiation

Arase, Sachiko*; Abe, Jun*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei; Kanazawa, Akira*

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 70, 2011/01

Journal Articles

Induction of Fusarium wilt resistant by ion beam irradiation in strawberry (${it Fragaria}$ $$times$$ ${it ananassa}$) leaf explants

Yotoriyama, Mamoru*; Takano, Junichi*; Namai, Kiyoshi*; Yoshihara, Ryohei; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 71, 2011/01

no abstracts in English

Journal Articles

Effect of different LET radiations on root growth of ${it Arabidopsis thaliana}$

Yoshihara, Ryohei; Nozawa, Shigeki; Saika, Hiroaki*; Teranishi, Mika*; Toki, Seiichi*; Hidema, Jun*; Sakamoto, Ayako

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 74, 2011/01

Journal Articles

Improved technique for hydrogen concentration measurement in fuel claddings by backscattered electron image analysis, 2

Onozawa, Atsushi; Harada, Akio; Honda, Junichi; Nakata, Masahito; Kanazawa, Hiroyuki; Sagawa, Tamio

JAEA-Conf 2008-010, p.325 - 332, 2008/12

The measurement technique for hydrogen concentration using Backscattered Electron Image analysis (BEI method) had been developed by Studsvik Nuclear AB. The hydride in claddings is identified using BEIs with SEM and the hydrogen concentration is calculated from the area fractions of the hydride in those BEIs. In the RFEF, the sample polishing techniques and image processing procedure for BEI method were improved to measure the hydrogen concentration in the irradiated fuel claddings more precisely. In the previous tests using the un-irradiated fuel claddings, it is confirmed improved BEI method has high reliability. The radial and axial hydrogen concentration profiles of the irradiated fuel claddings were measured with improved BEI method. As the results of these measurements, the local hydrogen concentration could be indicated more precisely with the improved BEI method compared to the other methods for the hydrogen concentration measurement and observation.

Journal Articles

Measurement of interaction forces between montmorillonite particles in NaCl solutions using a colloidal probe atomic force microscopy

Kurosawa, Susumu; Mizukami, Masashi*; Sato, Hisao*; Nozawa, Jun*; Tsujimoto, Keiichi*; Kurihara, Kazue*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 5(3), p.251 - 256, 2006/09

no abstracts in English

Journal Articles

Improved technique of hydrogen concentration measurement in fuel cladding by backscattered electron image analysis

Onozawa, Atsushi; Harada, Akio; Honda, Junichi; Yasuda, Ryo; Nakata, Masahito; Kanazawa, Hiroyuki; Nishino, Yasuharu

JAEA-Conf 2006-003, p.212 - 221, 2006/05

In the Reactor Fuel Examination Facility (RFEF), a measuring method of hydrogen concentration by backscattered electron image analysis was improved to obtain more local hydrogen concentration data in fuel claddings. The sample preparation and image analysis procedures of this were able to measure hydrogen concentration efficiently and precisely.

JAEA Reports

Hydrogen concentration measurement in fuel cladding by backscattered electron image analysis

Onozawa, Atsushi; Harada, Akio; Honda, Junichi; Yasuda, Ryo; Nakata, Masahito; Kanazawa, Hiroyuki; Nishino, Yasuharu

JAEA-Technology 2006-010, 19 Pages, 2006/03

JAEA-Technology-2006-010.pdf:2.3MB

A measurement technique for hydrogen concentration using Backscattered Electron Image analysis (BEI method) had been developed by Studsvik Nuclear AB, Sweden. The hydrides in claddings are identified using BEIs which are imaged with Scanning Electron Microscope, and the hydrogen concentrations are calculated from the area fractions of the hydrides in the matrix. The BEI method is very useful for the measurement in local hydrogen concentrations of fuel claddings. In the Reactor Fuel Examination Facility, a sample preparation, imaging conditions of SEM and image analysis procedures for the BEI method were improved. In addition, the hydrogen concentrations obtained by the improved BEI method and Hot Vacuum Extraction (HVE) method were compared to confirm the reliability of the improved BEI method. The results showed, the improved BEI method has the same reliability as that of HVE method and can be applied for the Post-Irradiation Examination.

Oral presentation

Thermal aging time dependence of nanostructural changes in an overlay-clad duplex stainless steel on a light-water pressure vessel steel

Kakubo, Yuta*; Nozawa, Yasuko*; Matsukawa, Yoshitaka*; Toyama, Takeshi*; Nagai, Yasuyoshi*; Kameda, Jun; Takeuchi, Tomoaki; Yamaguchi, Yoshihito; Katsuyama, Jinya; Nishiyama, Yutaka; et al.

no journal, , 

no abstracts in English

Oral presentation

Improvement of characteristics in sugarcane variety Ni17 by ion beam irradiation

Takenoshita, Yoshihisa*; Nagatani, Takeshi*; Oe, Masakazu*; Nagai, Junichi*; Nishi, Hiroyuki*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Analysis of visible mutations for effective generation of mutant population in soybean by ion beam irradiation

Kasai, Megumi*; Arase, Sachiko*; Abe, Jun*; Kanazawa, Akira*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Generation of strawberry yellows-resistant variety of Tochiotome by ion beam irradiation; Regeneration rate and inoculation test

Yotoriyama, Mamoru*; Takano, Junichi*; Namai, Kiyoshi*; Yoshihara, Ryohei; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Isolation of salt-sensitive mutants from ion beam-irradiated seeds of salt-resistant ${it Arabidopsis}$ and ${it Thellungiella}$

Horiguchi, Akane*; Ariga, Hirotake*; Igarashi, Junko*; Katori, Taku*; Sakata, Yoichi*; Hayashi, Takahisa*; Taji, Teruaki*; Yoshihara, Ryohei; Nozawa, Shigeki; Hase, Yoshihiro; et al.

no journal, , 

no abstracts in English

Oral presentation

3DAP analysis of a neutron-irradiated stainless steel weld-overlay cladding of nuclear reactor pressure vessel

Takeuchi, Tomoaki; Nishiyama, Yutaka; Katsuyama, Jinya; Onizawa, Kunio; Nozawa, Yasuko*; Matsukawa, Yoshitaka*; Toyama, Takeshi*; Nagai, Yasuyoshi*; Kameda, Jun*

no journal, , 

Microstructure evolution on stainless overlay cladding of reactor pressure vessel was quantitatively investigated by means of three-dimensional local electrode atom probe (3DAP) in nano-scale. The cladding material was neutron-irradiated up to 7$$times$$10$$^{19}$$ n/cm$$^{2}$$ (E $$>$$ 1 MeV) at JMTR. In ferrite phases of cladding material, a 12% of Cr concentration fluctuation, which was arisen through a spinodal decomposition, observed before the irradiation was progressed to 20% after the irradiation while the wave length of the fluctuation was almost not changed about 8-10 nm before and after the irradiation. In addition, Ni, Si and Mn concentration fluctuations were also observed. The concentration fluctuations of the elements other than Cr and differences from the thermal aging will be reported in presentation.

Oral presentation

Microstructural analysis of neutron-irradiated stainless steel weld-overlay claddings of nuclear reactor pressurevessel

Takeuchi, Tomoaki; Nishiyama, Yutaka; Katsuyama, Jinya; Onizawa, Kunio; Nozawa, Yasuko*; Matsukawa, Yoshitaka*; Toyama, Takeshi*; Nagai, Yasuyoshi*; Kameda, Jun*

no journal, , 

Microstructure evolutions on two types, namely electroslag (ESW) and submerged-arc (SAW) welding, of stainless overlay claddings of reactor pressure vessel were quantitatively investigated by means of three-dimensional local electrode atom probe (3DAP) in nano-scale. The cladding materials were neutron-irradiated up to about 7$$times$$10$$^{19}$$n/cm$$^{2}$$ (E $$>$$ 1 MeV) at JMTR. In ferrite phases of cladding materials, a 12% of Cr concentration fluctuation, which was arisen through a spinodal decomposition, observed before the irradiation was progressed to 20% after the irradiation while the wave length of the fluctuation was almost not changed about 8-10 nm before and after the irradiation. In addition, Ni, Si and Mn concentration fluctuations were also observed. Correlation between Cr concentration fluctuation and hardness, other elements concentration fluctuation and differences between the neutron irradiation and the thermal aging, the ESW and SAW will be reported in presentation.

Oral presentation

Generation of soy bean chlorophyl deficient mutants by ion beam irradiation and the exteriorization of additional mutations in self-fertilized progeny lines

Kasai, Megumi*; Abe, Jun*; Kanazawa, Akira*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Effect of oxidative DNA damage on radiation-induced mutagenesis in ${it Arabidopsis thaliana}$

Yoshihara, Ryohei; Hase, Yoshihiro; Nozawa, Shigeki; Narumi, Issei; Takimoto, Koichi*; Hidema, Jun*; Sakamoto, Ayako

no journal, , 

We analyzed $$gamma$$-ray-induced mutation spectrum in Arabidopsis seedling to investigate the effect of oxidative DNA damage on mutagenesis. Moreover, to evaluate the effect of nucleotide pool sanitization system on $$gamma$$-ray-induced mutations, we analyzed a mutant deficient in the Arabidopsis ${it NUDT1}$ gene that is a homologue of ${it mutT}$. The $$gamma$$-ray sensitivity of the ${it NUDT1}$ mutant was slightly higher, but not statistically significant, than that of wild type plant. However, the mutation spectra induced by $$gamma$$-rays were different between the wild type and ${it NUDT1}$ plants. From these results, it was suggested that the ${it NUDT1}$ deficiency obviously affects on the mutagenesis but not the plant growth following $$gamma$$-irradiation.

Oral presentation

Analysis of induced mutation spectrum in DNA repair-deficient plants

Teranishi, Mika*; Hidema, Jun*; Saika, Hiroaki*; Toki, Seiichi*; Yoshihara, Ryohei*; Nozawa, Shigeki; Hase, Yoshihiro; Sakamoto, Ayako

no journal, , 

no abstracts in English

Oral presentation

Changes of seed components in soy bean chlorophyl deficient mutants generated by ion beam irradiation

Tsuchiya, Mayumi*; Kasai, Megumi*; Abe, Jun*; Kanazawa, Akira*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei

no journal, , 

no abstracts in English

29 (Records 1-20 displayed on this page)