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Journal Articles

Effect of $$gamma$$ radiolysis on pit initiation of Zircaloy-2 in artificial seawater

Motooka, Takafumi; Komatsu, Atsushi; Tsukada, Takashi; Yamamoto, Masahiro

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 18, 2015/03

The effect of changes in water by $$gamma$$-ray irradiation on the pit initiation of Zircaloy-2 in artificial seawater was investigated. Surface analysis and electrochemical test were conducted. They showed that the hydrogen peroxide produced by $$gamma$$ irradiation forms a passive film and the passive film is resistant to the pit initiation.

Journal Articles

Degradation behavior of LED and photo diode by $$gamma$$ irradiation

Takeuchi, Tomoaki; Hanakawa, Hiroki; Shibata, Hiroshi; Uehara, Toshiaki; Ueno, Shunji; Kumahara, Hajime*; Tsuchiya, Kunihiko

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 33, 2015/03

$$gamma$$ irradiation effects on LEDs and photo diodes (PDs) were evaluated toward the development of a radiation-resistant in-water wireless transmission system using visible light. The current-voltage characteristics and total luminous flux of the LEDs and the dark current and light sensitivity of the PDs were measured before and after the irradiation. After the irradiation, for the LEDs, the total luminous flux decreased and the resin lenses turned oxblood. Meanwhile, the current-voltage characteristics hardly changed. For the PDs, the light sensitivity decreased and the resin window turned oxblood while the dark currents stayed at most 10 nA. These results indicated that both the decreases of the total luminous flux of the LEDs and the light sensitivity of the PDs were mainly caused by not the degradation of the semiconductor parts but the coloring of the resin parts by the irradiation.

Journal Articles

Effect of chloride and bromide ion on the concentration of hydrogen peroxide produced from seawater radiolysis

Hata, Kuniki; Hanawa, Satoshi; Motooka, Takafumi; Tsukada, Takashi

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 22, 2015/03

Fukushima Daiichi Nuclear Power Plants experienced seawater injection into the cores and spent fuel pools as an emergent measure for a short period after the accident. The injected seawater was exposed to radiation, and radiolytic species were produced. Especially, hydrogen peroxide (H$$_{2}$$O$$_{2}$$) is known as an oxidant which affects corrosion of materials. In order to identify the important factor which results in the high concentration of H$$_{2}$$O$$_{2}$$ in seawater radiolysis, the concentrations of H$$_{2}$$O$$_{2}$$ in $$gamma$$-irradiated artificial seawater was measured and compared with the result of radiolysis calculation. Solutions containing some constituents of seawater were also measured to identify which ion affects H$$_{2}$$O$$_{2}$$ production of seawater radiolysis. The experimental results showed that the H$$_{2}$$O$$_{2}$$ production from seawater radiolysis is mainly attributed to reactions of Cl$$^{-}$$ and Br$$^{-}$$ in water radiolysis, though many kinds of ions are dissolved in seawater.

Journal Articles

Observation of oxidized region in $$gamma$$-ray irradiated polyethylene with KOH treatment and SEM-EDS

Shimada, Akihiko; Sugimoto, Masaki; Yoshikawa, Masahito

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 30, 2015/03

In case of the accelerated ageing test on polymer cable insulation used for the nuclear power facility, it is very important to recognize whether oxygen penetrates in the polymer wholly or not. To confirm this, there are the method by which polymer is soaked in the KOH solution at 70$$^{circ}$$C for 5 minutes, dried and observed by a SEM-EDS, only for ethylene propylene rubber, one of the polymers. This study is to apply that method for polyethylene. Polyethylene sheet of 2 mm thickness was irradiated by $$gamma$$ ray at a dose rate of 2 kGy/h for 400 h. A piece of irradiated polyethylene was picked up and the piece was soaked in the KOH solution for 24 h. After that, the piece was observed by a SEM-EDS. At the region within 70 micro meters from the surface, potassium is observed. It means that oxidation is occurred in this region. From now on, optimum soaking time will be examined.

Journal Articles

Utilization status of the electron accelerator and the $$gamma$$-ray irradiation facilities

Agematsu, Takashi; Hanaya, Hiroaki; Yamagata, Ryohei; Seito, Hajime; Nagao, Yuto; Kaneko, Hirohisa; Yamaguchi, Toshiyuki*; Kawashima, Ikuo*; Yagi, Norihiko*; Takagi, Masahide*; et al.

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 183, 2015/03

The electron accelerator and the three $$gamma$$-ray irradiation facilities were operated for various research subjects according to the operation plan in FY 2013. The number of research subjects at the electron accelerator and at the $$gamma$$-ray irradiation facilities kept constant from FY 2012. Among these research subjects, 47 and 91 ones respectively performed at the electron accelerator and the $$gamma$$-ray irradiation facilities were relevant to recovery from the Fukushima Daiichi nuclear disaster.

Journal Articles

Operation of the electron accelerator and the $$gamma$$-ray irradiation facilities

Agematsu, Takashi; Hanaya, Hiroaki; Yamagata, Ryohei; Seito, Hajime; Nagao, Yuto; Kaneko, Hirohisa; Yamaguchi, Toshiyuki*; Kawashima, Ikuo*; Yagi, Norihiko*; Takagi, Masahide*; et al.

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 182, 2015/03

The electron accelerator and the $$gamma$$-ray irradiation facility have been operated approximately smoothly. The annual operation time in FY 2013 for the electron accelerator, the first, the second cobalt irradiation facility and food irradiation facility are 1242 h, 18,900 h, 11,804 h and 6,587 h, respectively. Typically repairs were next ones. The SF$$_{6}$$ gas withdrawal system was renewed at the electron accelerator. The 600 m$$^{3}$$ water storage tank was installed to keep pool-water for the cobalt facilities maintenance. New pieces of $$^{60}$$Co sources were purchased and loaded to the first and the second irradiation facility. The maintenance check was done for the food irradiation facility.

Journal Articles

Characterization of Pt and Pd epitaxial films on sapphire substrates by RBS/channeling

Yamamoto, Shunya; Hakoda, Teruyuki; Yoshikawa, Masahito

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 129, 2015/03

no abstracts in English

Journal Articles

Irradiation effect of gamma rays on cyanate ester/epoxy resins, 3

Idesaki, Akira; Uechi, Hiroki*; Hakura, Yoshihiko*; Kishi, Hajime*

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 29, 2015/03

Effects of gamma-ray irradiation on a cyanate ester/epoxy resin composed of dicyanate ester of bisphenol A (DCBA) and diglycidyl ether of bisphenol A (DGEBA) was investigated by changes in physicochemical properties such as gas evolution behavior, change in chemical structure, and so on, after the gamma-ray irradiation with dose of 100 MGy as maximum under vacuum. It was found that ether linkages are mainly decomposed by the gamma-ray irradiation with evolving gases of hydrogen, carbon dioxide and carbon monoxide and decreasing in glass transition temperature.

Journal Articles

Synthesis and ${{it in vitro}}$ evaluation of $$^{64}$$Cu-labeled peptide for tumor imaging

Sugo, Yumi; Sasaki, Ichiro; Watanabe, Shigeki; Ohshima, Yasuhiro; Ishioka, Noriko

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 100, 2015/03

MARSGL peptide (H-Met-Ala-Arg-Ser-Gly-Leu-OH) has high affinity to the human epidermal growth factor receptor 2 (HER2) overexpressing in various tumor cells. Copper-64 ($$^{64}$$Cu) is a useful radionuclide in nuclear medicine, and can be produced by the cyclotron. In this study, we designed and synthesized $$^{64}$$Cu-labeled MARSGL peptide conjugated with 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) as a novel positron emission tomography (PET) imaging probe for HER2 overexpressing tumors. The formation of $$^{64}$$Cu-DOTA-MARSGL was determined by TLC and HPLC compared with a non-radioactive preparation. It was confirmed that $$^{64}$$Cu-DOTA-MARSGL was obtained in high radiochemical yield more than 94%. We also examined a stability of $$^{64}$$Cu-DOTA-MARSGL ${it in vitro}$. The chromatogram was not changed after incubation in physiological saline at 37$$^{circ}$$C overnight. In order to evaluate the usefulness as a PET imaging probe, further ${it in vitro}$ studies on the stability in human or mice plasma and the cellular uptake are in progress.

Journal Articles

Complexation of lutetium-177 with bifunctional chelators in the presence of Mg, Cu, and Yb

Watanabe, Satoshi; Hashimoto, Kazuyuki; Ishioka, Noriko

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 102, 2015/03

Journal Articles

Development of a scintillator for single-ion detection

Yokoyama, Akihito; Kada, Wataru*; Sato, Takahiro; Koka, Masashi; Yamamoto, Shunya; Kamiya, Tomihiro; Yokota, Wataru

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 168, 2015/03

no abstracts in English

Journal Articles

Dose responses of irradiated fresh papaya recorded on ESR at different temperature

Kikuchi, Masahiro; Ukai, Mitsuko*; Kobayashi, Yasuhiko

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 89, 2015/03

Journal Articles

Analysis of radicals induced in irradiated amino acid using Pulse-ESR

Kishida, Keigo*; Kikuchi, Masahiro; Nakamura, Hideo*; Kobayashi, Yasuhiko; Ukai, Mitsuko*

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 90, 2015/03

Journal Articles

Metabolome analysis of leaves of ${it Rumex obtusifolius}$ L. irradiated with ion beams

Miyagi, Atsuko*; Kitano, Sayaka*; Ono, Yutaka; Hase, Yoshihiro; Kawai, Maki*; Ono, Yutaka

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 114, 2015/03

Journal Articles

Screening of salt tolerant mutants regenerated from irradiated stem segments of Lombardy poplar (${it Populus nigra}$)

Biswas, K. K.*; Hase, Yoshihiro; Ono, Yutaka

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 113, 2015/03

Journal Articles

Development of new ${it Chrysanthemum Morifolium}$ pink mutants through ion beam irradiation

Zaiton, A.*; Affrida, A. H.*; Shakinah, S.*; Nurul Hidayah, M.*; Hase, Yoshihiro; Ono, Yutaka

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 108, 2015/03

Journal Articles

Study on the sample preparation method for ion beam irradiation in ${it Citrus unshiu}$

Matsuo, Yoichi*; Hase, Yoshihiro; Takeshita, Hiroki*; Notomi, Asako*

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 111, 2015/03

no abstracts in English

Journal Articles

Molecular analysis of heavy ion induced mutations in budding yeast ${it S. cerevisiae}$

Matsuo, Yoichiro*; Izumi, Yoshinobu*; Hase, Yoshihiro; Sakamoto, Ayako; Shimizu, Kikuo*

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 119, 2015/03

no abstracts in English

Journal Articles

Breeding of flower-color mutation in Spray-mum by ion beam irradiation

Tanogashira, Yuki*; Nagayoshi, Sanetaka*; Tojima, Futoshi*; Hase, Yoshihiro

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 109, 2015/03

no abstracts in English

Journal Articles

Step-wise improvement of chrysanthemum by ion beam irradiation

Tanogashira, Yuki*; Nagayoshi, Sanetaka*; Tojima, Futoshi*; Hase, Yoshihiro

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 110, 2015/03

no abstracts in English

50 (Records 1-20 displayed on this page)