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Journal Articles

Preparation of polymer gel dosimeters based on less toxic monomers and gellan gum

Hiroki, Akihiro; Sato, Yuichi*; Nagasawa, Naotsugu; Ota, Akio*; Seito, Hajime; Yamabayashi, Hisamichi*; Yamamoto, Takayoshi*; Taguchi, Mitsumasa; Tamada, Masao; Kojima, Takuji

Physics in Medicine & Biology, 58(20), p.7131 - 7141, 2013/10

 Times Cited Count:17 Percentile:54.99(Engineering, Biomedical)

Journal Articles

Purification of gas using electron beam

Hirota, Koichi; Hakoda, Teruyuki; Shimada, Akihiko; Taguchi, Mitsumasa; Kimura, Atsushi; Kojima, Takuji

Proceedings of 12th International Conference on Radiation Curing in Asia (RadTech Asia 2011) (Internet), p.108 - 109, 2011/06

We have focused on using MnO$$_2$$ for the oxidation of intermediates produced from electron beam irradiation of VOC. Manganese dioxide can decompose ozone, produced by the irradiation of air containing VOCs, into activated oxygen, which can ultimately oxide the intermediates. Hybrid system equipped with electron accelerator and MnO$$_2$$ has demonstrated the complete oxidation of the intermediates produced during the irradiation of xylene and toluene. The electron-beam treatment of dioxin from municipal solid waste incinerator was carried out at Takahama Clean Center in Japan. An incinerator gas of 1000 m$$^3$$N/h was diverted downstream of a dry electric precipitator and was irradiated with electron beams using an electron accelerator that supplied 300 kV with a maximum energy of 12 kW. The results showed electron-beam is a promising technology for destroying dioxin in exhaust gases.

Journal Articles

Polyvinyl butyral films containing Leuco-Malachite Green as low-dose dosimeters

Hoang, H. M.*; Solomon, H. M.*; Taguchi, Mitsumasa; Kojima, Takuji

Radiation Physics and Chemistry, 77(4), p.457 - 462, 2008/04

 Times Cited Count:37 Percentile:90.63(Chemistry, Physical)

Thin films containing leuco-malachite green (LMG) dye in polyvinyl butyral (PVB) have been developed for lower dose measurements of a few hundreds Gy level. The film shows significant color change in the visible range and the sensitivity of the film to absorbed dose was enhanced by addition of chloride containing compounds such as chloral hydrate or 2,2,2-trichloroethanol. The film is useful as dosimeters for dose measurements e.g. in food irradiation and environmental protection.

Journal Articles

Transient absorption of a cation radical of pyrene induced by heavy ion beam pulses

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 160, 2008/03

no abstracts in English

Journal Articles

Dependence of differential yields of heavy ion induced OH radicals in water on mass and specific energy of heavy ions, and elapsed time

Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 62, 2007/02

no abstracts in English

Journal Articles

Development of the heavy ion beam pulse radiolysis

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 141, 2007/02

no abstracts in English

Journal Articles

Decomposition of endocrine disrupting chemicals in real wastewater by $$^{60}$$Co $$gamma$$-ray irradiations

Kimura, Atsushi; Taguchi, Mitsumasa; Otani, Yoshimi*; Hiratsuka, Hiroshi*; Kojima, Takuji

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 61, 2007/02

no abstracts in English

Journal Articles

Development of electron beam technology for the treatment of PCDD/Fs in municipal waste incinerator gases

Hirota, Koichi; Taguchi, Mitsumasa; Hakoda, Teruyuki; Kojima, Takuji

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 59, 2007/02

no abstracts in English

Journal Articles

LET effect on irradiation of hydroxy imide compounds in alcohol solution

Nakagawa, Seiko*; Ota, Nobuaki*; Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 142, 2007/02

no abstracts in English

Journal Articles

Yield of OH radicals in water under heavy ion irradiation; Dependence on mass, specific energy, and elapsed time

Taguchi, Mitsumasa; Kojima, Takuji

Nuclear Science and Techniques, 18(1), p.35 - 38, 2007/02

 Times Cited Count:19 Percentile:77(Nuclear Science & Technology)

Dependence of yields of OH (hydroxyl) radicals on the mass and specific energy of heavy ions and elapsed time after irradiation was investigated to understand chemical reactions of aqueous solutions. The yields of irradiation products of phenol super-linearly increased with the incident energy of He, C and Ne ions ranging from 2 to 18 MeV/u. The yields of the OH radicals were estimated by analyzing the yields of the irradiation products of phenol. The yields of the OH radicals increase with the specific energy for each ion, but decrease both with the mass of each ion at the same specific energy and elapsed time after irradiation.

Journal Articles

Radiolytic degradation of octachlorodibenzo-$$p$$-dioxin and octachlorodibenzofuran in organic solvents and treatment of dioxin-containing liquid wastes

Zhao, C.; Hirota, Koichi; Taguchi, Mitsumasa; Takigami, Machiko*; Kojima, Takuji

Radiation Physics and Chemistry, 76(1), p.37 - 45, 2007/01

 Times Cited Count:11 Percentile:66.38(Chemistry, Physical)

no abstracts in English

Journal Articles

Characteristics study on suspended fine particles in aqueous phenol solution formed by electron beam irradiations

Taguchi, Mitsumasa; Zennyoji, Yoshihiro*; Takigami, Machiko*; Baldacchino, G.*; Kimura, Atsushi; Hiratsuka, Hiroshi*; Namba, Hideki; Kojima, Takuji

Radiation Physics and Chemistry, 75(5), p.564 - 571, 2006/03

 Times Cited Count:6 Percentile:41.63(Chemistry, Physical)

The suspended fine particles formed in aqueous phenol solution under high dose irradiation were studied using the MeV electron beam and $$^{60}$$Co $$gamma$$-ray irradiations. The fine particle's size was 100-800 nm in diameter and became bigger at higher dose and lower dose rate. The distributions of the particle size became narrower for irradiation at higher dose rate. The fine particles were regarded to consist of molecules of about 1.9$$times$$10$$^{2}$$ molecular weight.

Journal Articles

Time-dependence of differential G-values of OH radicals in water under Ne ion radiolysis

Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2005-001, TIARA Annual Report 2004, p.181 - 182, 2006/01

The yields of OH radicals in water containing phenol have been investigated for several ten MeV/n C ion and Ne ion having the same LET value, as a function of the residual ion energy at the specific depth in water. In this study, beside such energy dependence, the dependence of reaction time of OH radical yield was examined by changing the concentration of phenol as solute. The defferential G'-values of OH radicals, those G-values per kinetic energy of ions increase with specific energy of Ne ions. The G'-value just after irradiation(1.5ns) is relatively high but become lower with reaction time to be the value (2.7) obtained for $$^{60}$$Co $$gamma$$-rays. It suggests the diffusion behavior of OH radicals locally induced in water.

Journal Articles

Micro-PIXE for the study of atmospheric environment

Kasahara, Mikio*; Ma, C.-J.*; Okumura, Motonori*; Kojima, Takuji; Hakoda, Teruyuki; Taguchi, Mitsumasa; Sakai, Takuro; Ohara, Yoshihiro

JAEA-Review 2005-001, TIARA Annual Report 2004, p.293 - 295, 2006/01

Artificial cloud generation experiment was performed using a huge vertical pit located in Kamaishi iron-copper mine to investigate the characteristics of cloud. The physical and chemical properties of individual cloud droplets were examined by microscopic analysis at Kyoto university and micro-PIXE analysis at TIARA. The process of growth of cloud was clarified based on the result on droplet size, its distribution, droplet number concentration, and the change in distribution of chlorine in droplet as the function of size.

Journal Articles

Study of radiation-induced primary process by ion pulse radiolysis

Yoshida, Yoichi*; Yang, J.*; Kondo, Takafumi*; Seki, Shuhei*; Kozawa, Takahiro*; Tagawa, Seiichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji; Namba, Hideki

JAEA-Review 2005-001, TIARA Annual Report 2004, p.183 - 185, 2006/01

A heavy-ion-pulse radiolysis technology was developed using a single-photon-counting system. In the system, the ion beam was injected a thin scintillator before irradiating the sample. The light emitted from the scintillator by the ion irradiation was used as analyzing source to detect the absorption of primary species in water. Measurement of time-dependent absorption of hydrated electrons in water was achieved using the system, which demonstrates the usefulness of this technique.

Journal Articles

Decomposition of ${it p}$-nonylphenols in water and elimination of their estrogen activities by $$^{60}$$Co $$gamma$$-ray irradiation

Kimura, Atsushi; Taguchi, Mitsumasa; Otani, Yoshimi*; Takigami, Machiko; Shimada, Yoshitaka*; Kojima, Takuji; Hiratsuka, Hiroshi*; Namba, Hideki

Radiation Physics and Chemistry, 75(1), p.61 - 69, 2006/01

 Times Cited Count:13 Percentile:66.03(Chemistry, Physical)

Decomposition of ${it p}$-Nonylphenols (NPs) in water at 1 $$mu$$mol dm$$^{-3}$$ was decreased exponentially with absorbed dose when NPs were irradiated by $$^{60}$$Co$$gamma$$-rays. Two products having molecular weight of 236, presumably OH adducts of NPs, were detected by LC-MS analyses. The elimination of estrogen activity of aqueous NPs solution including such irradiation products at 5000 Gy (J kg$$^{-1}$$) was confirmed by the yeast two hybrid assay. These results should expand the application of ionizing radiation to the treatment of NPs.

Journal Articles

Yield of OH radicals in water under high-density energy deposition by heavy-ion irradiation

Taguchi, Mitsumasa; Kojima, Takuji

Radiation Research, 163(4), p.455 - 461, 2005/04

 Times Cited Count:25 Percentile:57.57(Biology)

no abstracts in English

JAEA Reports

Decomposition of $$it p$$-nonylphenols in water by $$^{60}$$Co $$gamma$$-ray irradiation

Kimura, Atsushi; Taguchi, Mitsumasa; Kojima, Takuji; Hiratsuka, Hiroshi*; Namba, Hideki

JAERI-Research 2004-018, 49 Pages, 2005/01

JAERI-Research-2004-018.pdf:6.6MB

no abstracts in English

Journal Articles

Micro-PIXE technique for the study of asian dust sources

Kasahara, Mikio*; Ma, C.-J.*; Okumura, Motonori*; Kojima, Takuji; Hakoda, Teruyuki; Taguchi, Mitsumasa; Sakai, Takuro; Ohara, Yoshihiro

JAERI-Review 2004-025, TIARA Annual Report 2003, p.256 - 258, 2004/11

As the source of Asian dust particles, the sands at four different desert areas in China were to be the target of bulk and single analyses by means of PIXE and micro-PIXE analyses, respectively. The physical properties of desert sands like morphology, color, and size were basically determined. Also the chemical characteristics of bulk sands of each desert were specified as the relative elemental mass. The elemental maps and spectra for individual sands allow us to understand the nature of individual sands. Consequently, the physicochemical properties of desert sands obtained from this study can be helpful to understand what kinds of man-made pollutants and sea-salts are incorporated into natural Asian dust particles.

Journal Articles

Yield of OH radicals in water under heavy ion radiolysis

Taguchi, Mitsumasa; Kojima, Takuji

JAERI-Review 2004-025, TIARA Annual Report 2003, p.139 - 140, 2004/11

no abstracts in English

56 (Records 1-20 displayed on this page)