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Journal
Kagaku Kogyo; ISSN 0451-2014; 
; v. 74(2); p. 103-108
; v. 74(2); p. 103-108
[en] Radiation induced polymerizations and reductions in ionic liquids are introduced in this report. Ionic liquids are suitable substitutes not only for organic solvents as media for radiation induced reactions but also enhance their reactivities. (author)
Journal
Hoshasen Kagaku (Online); ISSN 2188-0115; ; (no.91); p. 27-31
; (no.91); p. 27-31
[en] Optical fibers have advantages like flexible configuration, intrinsic immunity for electromagnetic fields etc., and they have been used as optical fiber sensors. By some of these techniques, continuous or discrete distribution of physical parameters can be measured. Here, in order to apply Raman distributed temperature sensor (RDTS) to the monitoring of nuclear facilities, some correction techniques for radiation induced errors were investigated. It has been shown that, when uniform loss distribution can be assumed, simple correction technique with two thermocouples can be applied. Moreover, if loop type arrangement is applied, even when the loss distribution is not uniform, radiation induced errors can be canceled. For the demonstration of the feasibility of this technique, measurements using a commercial RDTS system were carried out along the primary piping system of the experimental fast reactor: JOYO. During the continuous measurements with the total dose of more than 107R, the radiation induced errors showed a saturating tendency. The correction technique with two thermocouples was applied and its feasibility has been demonstrated. Although the time response of the system should be improved, the RDTS can be expected as a noble temperature monitor in nuclear facilities. (author)
Journal
Journal of Nuclear Science and Technology (Tokyo); ISSN 0022-3131; ; v. 35(8); p. 547-553
; v. 35(8); p. 547-553
[en] In recent years, the promotion of recycling of steels is desired from the viewpoints of effective usage resources and restraint of CO2 emission. On the other hand, some elements (As, Sb, Bi, B, Zn and so on) affect seriously the characteristics of recycled steel and it is difficult tc refine away these elements from recycled steel in the iron recycling process. These elements are called tramp elements. For that reason, a new technique to determine the tramp elements in steel is demanded. In this paper, tramp elements, As and Sb, in iron certified reference materials were determined by neutron activation analysis with multiple gamma-ray detection method. For determination of As, two samples (JSS001-5, JSS168-7) were irradiated for 10 min at a neutron flux of 5.2 x 1017 m-2s-1 and measured by the multiple gamma-ray detector, GEMINI-II, which consists of 16 Ge detectors with BGO Compton suppressor, for 12 h. For determination of Sb, seven samples (JSS001-5, JSS003-2,4 and so on) were irradiated for 5 h at a neutron flux of 9.6 x 1017m-2s-1 and measured by GEMINI-II for 24h. The determined values were in good agreement with the certified and reference values. The lower limit of determination values for As and Sb in high purity iron were 0.01 and 0.003 ppm, respectively. The demand on the limit of determination values for As and Sb is 0.1 ppm. From these results, this method has turned out to be useful for determining As and Sb in recycled steel. (author)
Journal
Tetsu To Hagane; ISSN 0021-1575; ; v. 90(12); p. 1004-1009
; v. 90(12); p. 1004-1009
[en] The radiation-induced decomposition of trace amounts of 17 β-estradiol (E2) in water was studied as a function of the dose of 60Co γ-rays. The rate constant of the reaction of the OH radicals with E2 was estimated to be 1.6x1010 mol dm-3 s-1 by a comparison with the known rate constant for the reaction with phenol. Both E2 and E2-equivalent concentrations were estimated by LC-MS and ELISA, and decreased with an increase in γ-rays dose. E2 (1.8 nmol dm-3) in water was degraded almost completely by irradiations up to 10 Gy. The estrogen activity of the same sample solution still remained at a dose of 10 Gy, but decreased at 30 Gy to the lower than the threshold level of contamination to induce some estrogenic effects on the environmental ecology
Journal
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