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Journal Articles

A New application technique of a position-sensitive liquid light guide Cerenkov counter for the simultaneous position detection of $^{90}$ Sr/ $^{90}$ Y and $^{137}$ Cs radioactivity

Terasaka, Yuta; Uritani, Akira*

Nuclear Instruments and Methods in Physics Research A, 1049, p.168071_1 - 168071_7, 2023/04

https://doi.org/10.1016/j.nima.2023.168071

Times Cited Count：0 Percentile：0.02(Instruments & Instrumentation)

Journal Articles

Measurement of cesium isotopic ratio by thermal ionization mass spectrometry for neutron capture reaction studies on $^{135}$ Cs

Shibahara, Yuji*; Nakamura, Shoji; Uehara, Akihiro*; Fujii, Toshiyuki*; Fukutani, Satoshi*; Kimura, Atsushi; Iwamoto, Osamu

Journal of Radioanalytical and Nuclear Chemistry, 325(1), p.155 - 165, 2020/07

https://doi.org/10.1007/s10967-020-07198-2

Times Cited Count：8 Percentile：71.58(Chemistry, Analytical)

The measurements of isotopic ratios of Cs samples by thermal ionization mass spectrometry were performed for the analysis of their samples used to evaluate nuclear data obtained for $^{135}$ Cs. To obtain a high intensity and stable ion beam, the effects of additive agents on the ionization of Cs were examined. The effect of silicotungstic acid on the ionization of Cs was the largest among the additive agents studied in the present study, while the silicotungstic acid also showed the largest isobaric interference of polyatomic ions. It was demonstrated that as small as 210 $^{-13}$ g of a Cs sample was sufficient to achieve the analytical precision required to measure the $^{135}$ Cs/ $^{137}$ Cs ratio in the case where an additive agent of TaO/glucose was employed. After examining of the analytical conditions, such as the interference effect due to Ba, the measurements of the isotopic ratios of two Cs samples used in our study using TIMS were conducted, and it was discussed how much the ratios contributed to evaluation of the neutron capture cross-section of $^{135}$ Cs.

Journal Articles

Measurements of thermal-neutron capture cross-section of cesium-135 by applying mass spectrometry

Nakamura, Shoji; Shibahara, Yuji*; Kimura, Atsushi; Iwamoto, Osamu; Uehara, Akihiro*; Fujii, Toshiyuki*

Journal of Nuclear Science and Technology, 57(4), p.388 - 400, 2020/04

https://doi.org/10.1080/00223131.2019.1691077

Times Cited Count：3 Percentile：31.89(Nuclear Science & Technology)

The thermal-neutron capture cross-section ( $sigma_{0}$ ) and resonance integral(I $_{0}$ ) were measured for the $^{135}$ Cs(n,) $^{136}$ Cs reaction by an activation method and mass spectrometry. We used $^{135}$ Cs contained as an impurity in a normally available $^{137}$ Cs standard solution. An isotope ratio of $^{135}$ Cs and $^{137}$ Cs in a standard $^{137}$ Cs solution was measured by mass spectrometry to quantify $^{135}$ Cs. The analyzed $^{137}$ Cs samples were irradiated at the hydraulic conveyer of the research reactor in Institute for Integral Radiation and Nuclear Science, Kyoto University. Wires of Co/Al and Au/Al alloys were used as neutron monitors to measure thermal-neutron fluxes and epi-thermal Westcott's indices at an irradiation position. A gadolinium filter was used to measure the $sigma_{0}$ , and a value of 0.133 eV was taken as the cut-off energy. Gamma-ray spectroscopy was used to measure induced activities of $^{137}$ Cs, $^{136}$ Cs and monitor wires. On the basis of Westcott's convention, the $sigma_{0}$ and I $_{0}$ values were derived as 8.570.25 barn, and 45.33.2 barn, respectively. The $sigma_{0}$ obtained in the present study agreed within the limits of uncertainties with the past reported value of 8.30.3 barn.

Journal Articles

Model intercomparison of atmospheric $^{137}$ Cs from the Fukushima Daiichi Nuclear Power Plant accident; Simulations based on identical input data

Sato, Yosuke*; Takigawa, Masayuki*; Sekiyama, Tsuyoshi*; Kajino, Mizuo*; Terada, Hiroaki; Nagai, Haruyasu; Kondo, Hiroaki*; Uchida, Junya*; Goto, Daisuke*; Qulo, D.*; et al.

Journal of Geophysical Research; Atmospheres, 123(20), p.11748 - 11765, 2018/10

https://doi.org/10.1029/2018JD029144

Times Cited Count：40 Percentile：85.28(Meteorology & Atmospheric Sciences)

A model intercomparison of the atmospheric dispersion of $^{137}$ Cs emitted following the Fukushima Daiichi Nuclear Power Plant accident was conducted by 12 models to understand the behavior of $^{137}$ Cs in the atmosphere. The same meteorological data, horizontal grid resolution, and an emission inventory were applied to all the models to focus on the model variability originating from the processes included in each model. The multi-model ensemble captured 40% of the observed $^{137}$ Cs events, and the figure-of-merit in space for the total deposition of $^{137}$ Cs exceeded 80. Our analyses indicated that the meteorological data were most critical for reproducing the $^{137}$ Cs events. The results also revealed that the differences among the models were originated from the deposition and diffusion processes when the meteorological field was simulated well. However, the models with strong diffusion tended to overestimate the $^{137}$ Cs concentrations.

Journal Articles

Model testing using data on $^{137}$ Cs from Chernobyl fallout in the Iput River catchment area of Russia

Thiessen, K. M.*; Sazykina, T. G.*; Apostoaei, A. I.*; Balonov, M. I.*; Crawford, J.*; Domel, R.*; Fesenko, S.*; Filistovic, V.*; Galeriu, D.*; Homma, Toshimitsu; et al.

Journal of Environmental Radioactivity, 84(2), p.225 - 244, 2005/00

https://doi.org/10.1016/j.jenvrad.2004.10.016

Times Cited Count：7 Percentile：17.22(Environmental Sciences)

Data collected following the Chernobyl accident in 1986 have provided a unique opportunity to test the reliability of computer models for contamination of terrestrial and aquatic environments. The Iput River scenario was used by the Dose Reconstruction Working Group of BIOMASS. The test area was one of the most highly contaminated areas in Russia following the accident, with an average contamination density of $^{137}$ Cs of 800, 000 Bq m $^{-2}$ and localized contamination up to 1,500,000 Bq m $^{-2}$ , and a variety of countermeasures that were implemented in the test area had to be considered in the modelling exercise. Difficulties encountered during the exercise included averaging of data to account for uneven contamination of the test area, simulating the downward migration and decrease in bioavailability of $^{137}$ Cs in soil, and modelling the effectiveness of countermeasures. The accuracy of model predictions is dependent at least in part on the experience and judgment of the participant in interpretation of input information, selection of parameter values, and treatment of uncertainties.

Journal Articles

Model testing using data on $^{137}$ Cs from Chernobyl fallout in the Iput River catchment area of Russia

Thiessen, K. M.*; Sazykina, T. G.*; Apostoaei, A. I.*; Balonov, M.*; Crawford, J.*; Domel, R.*; Fesenko, S.*; Filistovic, V.*; Galeriu, D.*; Homma, Toshimitsu; et al.

Proceedings from the International Conference on Radioactivity in the Environment, p.317 - 320, 2002/09

no abstracts in English

Journal Articles