Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 23

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Zircon U-Pb and Fission-track ages for the Ohta Tephra in the Pliocene Tokai Group, Central Japan

Ueki, Tadamasa; Niwa, Masakazu; Iwano, Hideki*; Danhara, Toru*; Hirata, Takafumi*

Chishitsugaku Zasshi, 125(3), p.227 - 236, 2019/03

no abstracts in English

Journal Articles

Development in fission track- thermal ionization mass spectrometry for particle analysis of safeguards environmental samples

Lee, C. G.; Iguchi, Kazunari; Inagawa, Jun; Suzuki, Daisuke; Esaka, Fumitaka; Magara, Masaaki; Sakurai, Satoshi; Watanabe, Kazuo; Usuda, Shigekazu

Journal of Radioanalytical and Nuclear Chemistry, 272(2), p.299 - 302, 2007/05

 Times Cited Count:46 Percentile:94.41(Chemistry, Analytical)

no abstracts in English

Journal Articles

Challenge to ultra-trace analytical techniques of nuclear materials in environmental samples for safeguards at JAERI; Methodologies for physical and chemical form estimation

Usuda, Shigekazu; Yasuda, Kenichiro; Kokubu, Yoko; Esaka, Fumitaka; Lee, C. G.; Magara, Masaaki; Sakurai, Satoshi; Watanabe, Kazuo; Hirayama, Fumio; Fukuyama, Hiroyasu; et al.

International Journal of Environmental Analytical Chemistry, 86(9), p.663 - 675, 2006/08

 Times Cited Count:14 Percentile:41.71(Chemistry, Analytical)

The IAEA introduced the environmental sample analysis method, as a powerful tool to detect undeclared nuclear activities, into strengthened safeguards system. The principle of the method is that nuclear signatures can be evidenced if trace amount of nuclear materials in environmental samples taken from inside and outside of nuclear facilities are accurately analyzed. Currently, isotope ratios of uranium and plutonium in "swipe" samples are measured, which are collected in nuclear facilities. In future, the subject of environmental sample analysis will expand to soil, sediment, vegetation, water and airborne dust taken from outside of the nuclear facilities. If physical and chemical form of the nuclear materials is identified, we may estimate their origin, treatment process and migration behavior. This paper deals with the developed analytical techniques for the safeguards environmental samples, the current R&D on techniques related to estimation of the physical and chemical form, and possible analytical methodologies applicable to ultra-trace amounts of nuclear materials.

Journal Articles

Influence of uranium enrichment on the etching rate of polycarbonate fission track detector containing uranium particles

Lee, C. G.; Iguchi, Kazunari; Esaka, Fumitaka; Magara, Masaaki; Sakurai, Satoshi; Watanabe, Kazuo; Usuda, Shigekazu

Nuclear Instruments and Methods in Physics Research B, 245(2), p.440 - 444, 2006/04

 Times Cited Count:7 Percentile:48.44(Instruments & Instrumentation)

The etching rates of fission track detectors made of polycarbonate containing uranium particles were measured after thermal neutron irradiation with fluence of 8$$times$$10$$^{14}$$ n/cm$$^{2}$$, in order to study the influence of uranium enrichment on the etching rate that was calculated from the weight loss by etching. There is a strong correlation between the etching rate of detector and the enrichment E of uranium particle: the former increases as the latter increases. Particularly, the etching rate per particle was proportional to E$$^{2/3}$$ rather than E$$^{1}$$, which is probably due to the overlapping of fission tracks. The etching behaviors of detector revealed that the existence of two different etching rate regions, a nonlinear region in the beginning of etching process and a subsequent constant region, which was explained as the opening of fission tracks and the broadening of opened tracks, respectively.

Journal Articles

Study on the etching conditions of polycarbonate detectors for particle analysis of safeguards environmental samples

Iguchi, Kazunari; Esaka, Konomi; Lee, C. G.; Inagawa, Jun; Esaka, Fumitaka; Onodera, Takashi; Fukuyama, Hiroyasu; Suzuki, Daisuke; Sakurai, Satoshi; Watanabe, Kazuo; et al.

Radiation Measurements, 40(2-6), p.363 - 366, 2005/11

 Times Cited Count:11 Percentile:61.46(Nuclear Science & Technology)

In particle analysis for safeguards environmental samples, the fission track technique is very important to detect sub-micrometer particles containing uranium. In the technique the authors developed, the particles were recovered onto the polycarbonate membrane filter. The filter was dissolved in solvent and dried to form a thin film of detector, in which the particles were confined. After thermal neutron irradiation and etching, the particles of interest in the detector were easily identified with fission tracks, and were picked up for isotope ratio analysis. It was found, however, that the particles in the vicinity of the detector surface may fall off during the etching process. Therefore, optimization of the etching condition is required. In this work, the effects of etching time and enrichment of uranium in particles were investigated. Preliminary results suggest that etching time should be shorter with the increase in the enrichment.

Journal Articles

Feasibility study of solid sampling electrothermal vaporization inductively coupled plasma mass spectrometry for the determination of particulate uranium in swipe samples from nuclear facilities

Lee, C. G.; Iguchi, Kazunari; Esaka, Konomi; Magara, Masaaki; Esaka, Fumitaka; Sakurai, Satoshi; Watanabe, Kazuo; Usuda, Shigekazu

Analytica Chimica Acta, 517(1-2), p.215 - 220, 2004/07

 Times Cited Count:4 Percentile:14.3(Chemistry, Analytical)

In this study, we discussed the feasibility of solid sample ETV-ICP-MS for the particle analysis of the environmental swipe samples in order to establish the fission track-ETV-ICP-MS method. Samples used were solid samples containing Tl, Pb and U in polycarbonate film, and their standard solutions. The analytical performance will be reported in terms of the optimization of temperature program, and sensitivity and precision in isotope ratio measurement.

Journal Articles

Application of fission track technique for the analysis of individual particles containing uranium in safeguard swipe samples

Esaka, Konomi; Esaka, Fumitaka; Inagawa, Jun; Iguchi, Kazunari; Lee, C. G.; Sakurai, Satoshi; Watanabe, Kazuo; Usuda, Shigekazu

Japanese Journal of Applied Physics, Part 2, 43(7A), p.L915 - L916, 2004/07

 Times Cited Count:38 Percentile:78.08(Physics, Applied)

An effective method for isotope ratio analysis of individual particles containing uranium in safeguards swipe samples was developed by using a fission track (FT) technique combined with thermal ionization mass spectrometry (TIMS). The particles in the sample were directly recovered onto a polycarbonate membrane filter, which was set in a filtration system. After the particle recovery, the filter was dissolved to form a non-coated FT detector film containing the particles. Individual particles containing uranium were then identified by the observation of fission tracks created by thermal neutron irradiation. By combination of the FT technique with TIMS, isotope ratios of uranium for individual particles in the swipe sample prepared from a uranium standard reference material could be effectively determined.

Journal Articles

Formation of n-butane by fission fragment radiolysis of gaseous ethylene

Ikezoe, Yasumasa; ; Shimizu, Saburo

Radiation Physics and Chemistry, 21(3), p.341 - 344, 1983/00

no abstracts in English

Journal Articles

Staining with UF$$_{6}$$ on fission tracks in polyvinylidene fluoride

; ; ;

J.Electron Microsc., 31(2), p.191 - 193, 1982/00

no abstracts in English

Journal Articles

Fission fragment radiolysis of carbon dioxide

Ikezoe, Yasumasa; ; Shimizu, Saburo

Canadian Journal of Chemistry, 59(3), p.532 - 536, 1981/00

 Times Cited Count:5 Percentile:42.5(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Observation of nuclear track development in polyvinylidene fluoride with several etchants

;

J.Electron Microsc., 30(4), p.292 - 297, 1981/00

no abstracts in English

Journal Articles

Release of radiodine from U$$_{3}$$O$$_{8}$$; Possible chemical form of iodine

Nakashima, Mikio; Tachikawa, Enzo

Journal of Inorganic and Nuclear Chemistry, 43, p.1686 - 1687, 1981/00

 Times Cited Count:1 Percentile:11.9(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Fission fragment tracks in gases of 6-10 atm

Ikezoe, Yasumasa; ; Shimizu, Saburo

Radiation Physics and Chemistry, 17, p.63 - 67, 1981/00

no abstracts in English

Journal Articles

Growth of fine holes by the chemical etching of fission tracks in polyvinylidene fluoride

Nucl.Tracks, 13(1-2), p.33 - 44, 1979/00

no abstracts in English

Journal Articles

Chemical etching of fission tracks in polyfluoro plastic

;

Science, 199(4327), p.421 - 422, 1978/00

 Times Cited Count:14

no abstracts in English

Journal Articles

Radiation chemical reactions in carbon dioxide-propane system; Formation of carbon monoxide by fission fragments

Ikezoe, Yasumasa;

Journal of Nuclear Science and Technology, 13(9), p.503 - 507, 1976/09

 Times Cited Count:11

no abstracts in English

Journal Articles

Growth of fine holes in polyethylenenaphthalate film irradiated by fission fragments

;

Journal of Applied Physics, 47(4), p.1355 - 1358, 1976/04

 Times Cited Count:12

no abstracts in English

Journal Articles

Electron microscopy of fine holes in polyethyleneterephthalate films irradiated by fission fragments

; ; Izui, Kazuhiko;

Journal of Applied Physics, 46(3), p.1155 - 1158, 1975/03

 Times Cited Count:6

no abstracts in English

Journal Articles

Contribution of boron to radiation effect for pressure vessel steel weldment

Journal of Nuclear Science and Technology, 10(8), p.515 - 516, 1973/08

no abstracts in English

23 (Records 1-20 displayed on this page)