Neutron activation technique
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The obtained results with the neutron flux correction were found to be in good agreement with the certified values. In conclusion, the proposed technique can be applied for activation analyses without sandwiching flux monitors between samples during irradiations.
10p vicedric 08-02-2023 4 3 Download
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The main aims of this investigation were as follows: (1) to find out the elemental accumulation capacity of Barbular moss; (2) to evaluate the main sources of atmospheric pollution in the Thua Thien Hue province.
7p vicedric 08-02-2023 2 1 Download
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The use of nuclear techniques for elemental analysis has been successfully developed in many laboratories in the IAEA Member States, including Vietnam. Nuclear techniques have also been proven to be extremely powerful in provenancing samples relevant to forensics.
8p vicedric 08-02-2023 4 1 Download
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In the case of the irradiation position at the rotary rack of the Dalat Nuclear Research Reactor (DNRR), the difference of thermal neutron flux between the bottom (3.541012 n.cm-2 .s-1 ) and the top (1.931012 n.cm-2 .s-1 ) of the 15 cm aluminum container is up to 45%. Therefore, it is necessary to accurately determine above-mentioned parameters in the sample irradiation position. The present paper deals with the determination of the distribution of thermal neutron flux along the sample irradiation container by using 0.1% Au–Al wire activation technique.
10p trinhthamhodang1218 14-03-2021 15 2 Download
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The off-line activation technique using a spectroscopic system consisting of a HPGe semiconductor detector with high energy resolution and a PC based 8192 channel analyzer (CANBERRA) was applied. The investigated samples were prepared from the 99.99 % purity PdO and irradiated at the electron accelerator Microtron MT-25 of the Joint Institute for Nuclear Research Dubna, Russia. The data analysis and necessary corrections were made to upgrade the precision of the experimental method.
10p trinhthamhodang1218 14-03-2021 9 1 Download
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KGdF4 polycrystalline doped with the different concentration of Sm3+ ions were synthesized by hydrothermal technique. Thermoluminescence (TL) glow curves of samples were measured in the range from 50 oC to 400 oC after irradiating beta, neutron and X-ray radiations. The response of TL intensity to impurity concentration and neutron dose were studied in detail. The TL kinetic parameters such as activation energy (E) and frequency factor (s) were estimated by using the method of heating rate variation.
6p trinhthamhodang9 10-12-2020 14 1 Download
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Evaluating the neutronic state (neutron flux, power . . . ) of the whole nuclear core is a very important topic that has strong implication for nuclear core management and for security monitoring. The core state is evaluated using measurements and calculations.
9p christabelhuynh 31-05-2020 17 1 Download
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This review paper describes the destructive and non-destructive measurements implemented or under development at CEA, in view to perform the most complete radioactive waste characterization.
24p christabelhuynh 29-05-2020 5 2 Download
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Integrated cross sections of the photo-neutron reactions induced on 197AU with 60 mev bremsstrahlung
Seven photo-neutron reactions 197Au(γ ,xn)197-xAu (with x = 1 – 7) produced by the bremsstrahlung end-point energy of 60 MeV were identified. In this work, we focus on the measurement of integrated cross sections. Experiments were carried out based on the activation method in combination with off-line gamma-ray spectrometric technique. The integrated cross section of the investigated reactions were determined relative to that of the monitoring reaction 197Au(γ, n)196Au. To validate the experimental results, theoretical predictions were also made using the computer code TALYS 1.9.
11p 12120609 23-03-2020 14 1 Download
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In this research, dose calculation and measurement from B10 (n, α) Li7 reaction using filtered neutron beam at the Nuclear Research Institute have been reported. Calculation was carried out by Monte Carlo method using MCNP5 code.
7p vineptune2711 04-11-2019 11 0 Download
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An active neutron method for measuring the inherent neutron emission of spent fuel assembly is proposed. The count rate of the inherent neutron emission can be determined by changing intensity of neutron irradiating source. The practical meaning of the method is presented. Some attractive features of the method are shown.
5p nganga_02 09-09-2015 42 2 Download
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Small-angle neutron scattering experiments were performed on horse azidometmyoglobin (MbN3) at pressures up to 300 MPa.Other spectroscopic techniques have shown that a reorganization of the secondary structure and of the active site occur in this pressure range. The present measurements, performedusingvarious concentrations ofMbN3, showthat the compactness of the protein is not altered as the value of its radius of gyration remains constant up to 300 MPa.
7p research12 23-04-2013 53 2 Download
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As a consequence of the increasing importance of tritium resulting from nuclear fission and neutron activation, from its use in accelerators, from its use in research and industry, and from its use in the investigation of the environment and its distribution in the environment, the NCRP designated a scientific committee to prepare a report on the currently acceptable methods of measuring tritium. This report is particularly aimed in assisting an individual to select a procedure suitable to the problem at hand....
109p camchuong_1 04-12-2012 74 5 Download