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Journal Articles

A Simple method to create gamma-ray-source spectrum for passive gamma technique

Shiba, Tomooki; Maeda, Shigetaka; Sagara, Hiroshi*; Ishimi, Akihiro; Tomikawa, Hirofumi

Energy Procedia, 131, p.250 - 257, 2017/12

 Times Cited Count:0 Percentile:0.03

In the present paper, the $$gamma$$ ray source data was developed for the debris composition based on "best estimates", and the subsequent photon transportation calculation was performed to evaluate the leakage $$gamma$$ ray spectra according to the fuel debris. Since the creation of the line spectrum source requires a great deal, we have developed the relatively simple but accurate enough method to build up $$gamma$$ ray source, coupling of baseline spectra evaluated by ORIGEN2 code and several line spectra of interest. One of the advantages of the method is taking bremsstrahlung X rays into consideration by utilizing the bremsstrahlung libraries of ORIGEN2. The new $$gamma$$ ray source was used to calculate the detector response of HPGe detector and the results was compared as a benchmark with experimental measurement results of irradiated fuel pins. As the result, the simulated $$gamma$$ ray spectrum shape agreed well with the shape of $$gamma$$ ray spectrum obtained by the experiment.

Journal Articles

Characterization study of four candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Nauchi, Yasushi*; Maeda, Makoto; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Kureta, Masatoshi; Tomikawa, Hirofumi; Okumura, Keisuke; et al.

Energy Procedia, 131, p.258 - 263, 2017/12

 Times Cited Count:3 Percentile:92.06

Journal Articles

Characterization study of four candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station (Interim report)

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Maeda, Makoto; Nauchi, Yasushi*; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Kureta, Masatoshi; Tomikawa, Hirofumi; Okumura, Keisuke; et al.

Proceedings of INMM 57th Annual Meeting (Internet), 10 Pages, 2016/07

Journal Articles

The Effects of ion beam irradiation on variation in the M$$_{1}$$ generation of two strains of ${{it Delphinium grandiflorum}}$ var. ${{it chinense}}$

Honda, Kazushige*; Taneichi, Shuhei*; Maeda, Tomoo*; Goto, Satoshi*; Shikanai, Yasuhiro*; Sasaki, Kazuya*; Nozawa, Shigeki; Hase, Yoshihiro

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 107, 2016/02

no abstracts in English

Journal Articles

Nitric oxide-mediated bystander signal transduction induced by heavy-ion microbeam irradiation

Tomita, Masanori*; Matsumoto, Hideki*; Funayama, Tomoo; Yokota, Yuichiro; Otsuka, Kensuke*; Maeda, Munetoshi*; Kobayashi, Yasuhiko

Life Sciences in Space Research, 6, p.36 - 43, 2015/07

A radiation-induced bystander response is generally known as a cellular response induced in unirradiated cell by receiving bystander signaling factors released from directly irradiated cells of a cell population. Bystander responses induced by high-LET heavy ions at low fluence are an important problem concerning the health of astronauts in the space environment. Here we set out NO-mediated bystander signal transductions induced by high-LET heavy-ion microbeam irradiation in normal human fibroblasts. Our findings suggest that Akt- and NF-$$kappa$$B-dependent signaling pathway involving COX-2 plays an important role in the NO-mediated high-LET heavy-ion-induced bystander responses. Additionally, COX-2 may be used as a molecular marker of high-LET heavy-ion-induced bystander cells, which are distinguish form directly irradiated cells.

Journal Articles

Mechanisms for the induction of radioadaptive response by radiation-induced bystander response

Matsumoto, Hideki*; Tomita, Masanori*; Otsuka, Kensuke*; Hatashita, Masanori*; Maeda, Munetoshi*; Funayama, Tomoo; Yokota, Yuichiro; Suzuki, Michiyo; Sakashita, Tetsuya; Ikeda, Hiroko; et al.

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 76, 2015/03

The objective of this project is to elucidate molecular mechanisms for the induction of radioadaptive response through radiation-induced bystander responses induced by irradiation with heavy ion microbeams in JAEA. We found that the adaptive response was induced by Ar (520 MeV $$^{40}$$Ar$$^{14+}$$) microbeam-irradiation of a limited number of cells, followed by the broad beam-irradiation and that the adaptive response was almost completely suppressed by the addition of carboxy-PTIO, as a nitric oxide (NO) scavenger. In addition, we found several genes induced specifically and preferentially when radioadaptive response could be induced. We confirmed that ${it iNOS}$ expression was specifically induced only when radioadaptive response could be induced. Our findings strongly suggested that radioadaptive response can be induced by NO-mediated bystander responses evoked by irradiation with heavy ion microbeams.

Journal Articles

Effect of radial zoning of $$^{241}$$Am content on homogenization of denatured Pu with broad range of neutron energy based on U irradiation test in the experimental fast reactor Joyo

Shiba, Tomooki*; Sagara, Hiroshi*; Onishi, Takashi; Koyama, Shinichi; Maeda, Shigetaka; Han, C. Y.*; Saito, Masaki*

Annals of Nuclear Energy, 51, p.74 - 80, 2013/01

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

The design consideration of DU-Am oxide fuel pin was performed for Pu denaturing in the framework of the protected plutonium production based on the irradiation analyses of the depleted U (DU) samples irradiated in the environment of broad range of neutron energy in the experimental fast reactor Joyo. From the results of irradiation analyses of DU, it was confirmed that there is a strong dependence of transmutation behavior of DU on the resonance neutron ratio even in a fast reactor. Also, it was confirmed that there is a strong effect of sample material form and shape on generated Pu nuclide inventory especially near the reflector area ($$>$$20% resonance neutron ratio), because of the intensive self-shielding of $$^{238}$$U, though less is expected for $$^{241}$$Am. Sensitivity study of hypothetical DU-Am oxide fuel pellet irradiation on neutron energy and burn-up was performed to evaluate significant gradient of radial $$^{238}$$Pu isotopic composition profile (e.g., from 12 to 18% distribution in 3% Am doping, in 30% resonance neutron ratio and in 4.0$$times$$10$$^{22}$$ [n/cm$$^{2}$$] of neutron fluence inside a large pellet with softened neutron spectrum), and vulnerability of the fuel pellet surface in terms of Pu denaturing was revealed. Design consideration of radial zoning of $$^{241}$$Am content was introduced to flatten the radial distribution of isotopic composition of Pu. The results of radial zoning of $$^{241}$$Am (4% and 3% of Am in the outer and inner zone of DU-Am oxide fuel pellet) in hypothetical irradiation neutronics analysis showed the radial profile of produced Pu is over 15 at.% of $$^{238}$$Pu isotopic composition in any zone and meets the criteria of Kimura et al. based on decay heat of Pu to impede utilization to fission explosive devices.

Journal Articles

Effects of ion-beam irradiation on germination and growth of seedlings of red pepper "Hirosaki zairai"

Tomikawa, Masaru*; Maeda, Tomoo*; Honda, Kazushige*; Saga, Koichi*; Ishikawa, Ryuji*; Akita, Yusuke; Yoshihara, Ryohei; Nozawa, Shigeki; Narumi, Issei

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 73, 2011/01

Journal Articles

Microbeam irradiation facilities for radiobiology in Japan and China

Kobayashi, Yasuhiko; Funayama, Tomoo; Hamada, Nobuyuki*; Sakashita, Tetsuya; Konishi, Teruaki*; Imaseki, Hitoshi*; Yasuda, Keisuke*; Hatashita, Masanori*; Takagi, Keiichi*; Hatori, Satoshi*; et al.

Journal of Radiation Research, 50(Suppl.A), p.A29 - A47, 2009/03

 Times Cited Count:34 Percentile:72.55(Biology)

Oral presentation

Radiation-quality-dependence in bystander cellular effects on normal human cells induced by carbon-ion and X-ray microbeams

Suzuki, Masao*; Furusawa, Yoshiya*; Tsuruoka, Chizuru*; Kobayashi, Katsumi*; Usami, Noriko*; Maeda, Munetoshi*; Funayama, Tomoo; Sakashita, Tetsuya; Yokota, Yuichiro; Fukamoto, Kana; et al.

no journal, , 

no abstracts in English

Oral presentation

Research for Am-based proliferation resistance

Shiba, Tomooki*; Sagara, Hiroshi*; Saito, Masaki*; Koyama, Shinichi; Maeda, Shigetaka

no journal, , 

In order to design for FBR blanket fuel with high proliferation resistance, transmutation behavior of Am-containing depleted uranium under fast neutron environment is evaluated by computer simulation as a parameter of the Am content. Produced plutonium having high proliferation resistance are reduced with decreasing neutron energy in the case of Joyo irradiation condition.

Oral presentation

Effects of ion-beam irradiation on germination and growth of seedlings of redpepper "Hirosakizairai"

Tomikawa, Masaru*; Maeda, Tomoo*; Honda, Kazushige*; Saga, Koichi*; Ishikawa, Ryuji*; Akita, Yusuke; Nozawa, Shigeki; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Blanket fuel with high proliferation resistance in fast breeder reactor, 10; Theoretical analysis of irradiated samples in JOYO, 4

Shiba, Tomooki*; Sagara, Hiroshi*; Saito, Masaki*; Onishi, Takashi; Koyama, Shinichi; Maeda, Shigetaka

no journal, , 

In order to develop blanket fuel with high proliferation resistance in fast breeder reactor, production and incineration behavior of Pu in U samples irradiated in fast experimental reactor JOYO were evaluated by calculation. Results of sample irradiation loaded at different axial position were compared and dependence of transmutation behavior on neutron energy spectra were evaluated.

Oral presentation

Blanket fuel with high proliferation resistance in fast breeder reactor, 11; Prediction of P$$^{3}$$ mechanism inside pellet

Sagara, Hiroshi*; Shiba, Tomooki*; Saito, Masaki*; Onishi, Takashi; Koyama, Shinichi; Maeda, Shigetaka

no journal, , 

In order to develop blanket fuel with high proliferation resistance in fast breeder reactor, virtual irradiation behavior of Am-U pellets at different position in fast experimental reactor JOYO were analyzed. By detail calculation in pellets, rim effects in U-Am pellet irradiation were evaluated and feasibility of results of sample irradiation were investigated.

Oral presentation

Effect of ion beam irradiation to seeds on generation and growth in the seedling of capsicum native variety in Hirosaki

Maeda, Tomoo*; Tomikawa, Masaru*; Honda, Kazushige*; Saga, Koichi*; Ishikawa, Ryuji*; Akita, Yusuke; Yoshihara, Ryohei; Nozawa, Shigeki; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Expression of mutations in the M2 generation of red pepper "Hirosaki zairai" irradiated with ion beam

Sato, Yusuke*; Maeda, Tomoo*; Honda, Kazushige*; Saga, Koichi*; Ishikawa, Ryuji*; Akita, Yusuke; Yoshihara, Ryohei; Nozawa, Shigeki; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Expression of mutations in progeny of ion-beam irradiated Capsicum native variety in Hirosaki

Sato, Yusuke*; Maeda, Tomoo*; Honda, Kazushige*; Saga, Koichi*; Ishikawa, Ryuji*; Akita, Yusuke; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Blanket fuel with high proliferation resistance in fast breeder reactor, 15; Prediction of irradiation behavior of DU-Am pellets

Shiba, Tomooki*; Sagara, Hiroshi*; Han, C. Y.*; Saito, Masaki*; Onishi, Takashi; Koyama, Shinichi; Maeda, Shigetaka

no journal, , 

The design consideration of hypothetical depleted U and Am (DU-Am) oxide fuel pin was performed to produce Pu with high proliferation resistance in fast breeder reactors. As a result, DU-Am oxide fuel pellet with large diameter under epithermal neutron spectrum is desirable for the production of denatured Pu.

Oral presentation

Characterization study of candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station, 1; General outline

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Maeda, Makoto; Nauchi, Yasushi*; Sagara, Hiroshi*; Kureta, Masatoshi; Tomikawa, Hirofumi; Okumura, Keisuke; Heinberg, C.; et al.

no journal, , 

no abstracts in English

Oral presentation

Characterization study of candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station, 1; General outline

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Nauchi, Yasushi*; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Okumura, Keisuke; Maeda, Makoto; Toh, Yosuke; Hori, Keiichiro

no journal, , 

no abstracts in English

Oral presentation

Characterization study of four candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station, 1; General outline

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Nauchi, Yasushi*; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Okumura, Keisuke; Maeda, Makoto; Toh, Yosuke; Hori, Keiichiro

no journal, , 

21 (Records 1-20 displayed on this page)