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Ho Chi Minh City, Vietnam

Dung T.Q.,Center for Nuclear Techniques
International Journal of Nuclear Energy Science and Technology | Year: 2010

A simple gamma technique based on using two identical detectors has been studied and applied to assay radwaste drums. The characterisation and performance of the measurement system are discussed for practical application. The results show that the proposed technique successfully solved the problem of assay of unusual radwaste drums (as released from Dalat Nuclear Reactor, Vietnam). © 2010 Inderscience Enterprises Ltd.

Niimura N.,Ibaraki University | Kikuchi K.,Ibaraki University | Tuyen N.D.,Ibaraki University | Tuyen N.D.,Center for Nuclear Techniques | And 2 more authors.
Journal of Environmental Radioactivity | Year: 2015

We conducted an elution experiment with contaminated soils using various aqueous reagent solutions and autoradiography measurements of contaminated bamboo shoots and shiitake mushrooms to determine the physical and chemical characteristics of radioactive Cs from the Fukushima Daiichi Nuclear Power Plant accident. Based on our study results and data in the literature, we conclude that the active Cs emitted by the accident fell to the ground as granular non-ionic materials. Therefore, they were not adsorbed or trapped by minerals in the soil, but instead physically adhere to the rough surfaces of the soil mineral particles. Granular Cs* can be transferred among media, such as soils and plants. The physical properties and dynamic behavior of the granular Cs* is expected to be helpful in considering methods for decontamination of soil, litter, and other media. © 2013 The Authors.

Suc N.V.,Ho Chi Minh City University of Technology and Education | Bich T.T.,Center for Nuclear Techniques
Radiochimica Acta | Year: 2013

This paper presents a simple and accurate method for determination of uranium isotopes (234U and 238U) in seawater samples using alpha spectrometry. Uranium is pre-concentrated from seawater samples via adsorption on hydrotalcite at pH 6.5. The absorbent is dissolved into 50 ml of 8M HNO3; then filtered through a Dowex-1 column. U(VI) in the elution solution is reduced to U(IV) using zinc metal in 4M solution of HCl and then co-precipitated with LaF3. The chemical separation efficiency is found to be 97.12±2.68%, eliminating the need of using 232U tracer in other published methods. This method is validated via comparison with results obtained using inductively coupled plasma mass spectrometry (ICP-MS) and neutron activation analysis (NAA) for three seawater samples. © by Oldenbourg Wissenschaftsverlag, München.

Duc D.V.,Institute of Physics | Giao N.M.,Center for Nuclear Techniques | Dung T.T.,Thu Dau Mot University
International Journal of Theoretical Physics | Year: 2014

The mass spectrum for spinor fields in extra dimensions is considered within the framework of the mass creation mechanism proposed in our previous works (Duc and Giao 2013; Duc and Giao J. Mod. Phys. 4(N7), 991, 2013; Duc et al. J. Phys Sci. Appl. (USA) 4(N1), 60, 2014; Duc and Giao J. Mod. Phys. 5(N6), 2014). It is shown that a single spinor field in the whole space-time with extradimensions corresponds to a set of multiplets of effective spinor fields in ordinary 4-dimensional space-time with masses obeying the sum rule expressed in terms of metric for extradimensions and parameter functions dictated from the periodicity conditions. © 2014 Springer Science+Business Media New York.

Duc D.V.,Institute of Physics | Giao N.M.,Center for Nuclear Techniques
International Journal of Theoretical Physics | Year: 2016

We propose a mechanism for explaining the originality of charge creation based on some specific assumptions related to space – time extra dimensions. It holds that the existence and the compactification of extra dimensions are the origin for creating the interaction charge in ordinary 4 – dimensional space – time. © 2015, Springer Science+Business Media New York.

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