scholarly journals Determination of the neutron beam diameter based on the neutron activation analysis

2016 ◽  
Vol 19 (4) ◽  
pp. 147-153
Author(s):  
Son An Nguyen ◽  
Tien Van Dang ◽  
Thang Huu Ho ◽  
Hieu Bao Quoc Phan
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Neutron Beam ◽  
Nuclear Reactor ◽  
Nuclear Research ◽  
Beam Diameter ◽  
Analysis Errors ◽  
Reduced Data

Neutron beam diameter is a very important parameter in the experimental nuclear research. Determination of the correct neutron beam diameter is the best method to prepare corectly the optimal sample size correctly, reduced data analysis errors. To measure the neutron diameter, some methods were used: Simulation by Monte – Carlo method, neutron image, and neutron activation analysis. In this report, we determined the neutron beam diameter of the 3rd horizontal channel of the Dalat nuclear reactor that activated gold foils. The result shows that this method offer quick and more correct results than other methods which had been published preiously [1, 2].

scholarly journals DETERMINATION OF CONTENT OF SOME ELEMENTS IN THE HUMAN BLOOD BY METHOD OF INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS USING DALAT NUCLEAR REACTOR

2011 ◽  
Vol 14 (1) ◽  
pp. 47-54
Author(s):  
Hung Van Nguyen
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Human Blood ◽  
Nuclear Reactor ◽  
Gamma Spectrometer ◽  
Standard Samples ◽  
Instrumental Neutron Activation

Neutron activation analysis using nuclear reactor has been used widely to determine of content of elements in environment, biology, geology, archaeology, etc. In this report, determination of content of some elements in the human blood by method of instrumental neutron activation analysis using Dalat nuclear reactor coupled with processing of results by k-zero method (using k0-Dalat code) and by relative one (using standard samples) is presented. 50 samples of the human blood are mainly collected from public objects in Lamdong province. They are prepared and activated together with the standard samples at the dry channel No. 7-1 and the rotary specimen rack (wet channel) of the reactor. Then they are directly measured by the HPGe gamma spectrometer and the measured data are processed. The experimental results for determination of ranges of contents and average values for 8 elements respectively are Na (1.06 - 2,48; 1.71 ± 0.30 mg/ml), Cl (1.10 - 3.75; 2.66 ± 0.71 mg/ml), Fe (0.26 - 0.72; 0.49 ± 0.09 mg/ml), K (0.31 - 1.14; 0.73 ± 0.15 mg/ml), Zn (4.55 - 13.97; 8.08 ± 1.24 μg/ml), Rb (2.73 - 7.92; 5.11 ± 0.86 μg/ml), Se (0.04 - 0.18; 0.08 ± 0.03 μg/ml) and Sc (0.22 – 1.61; 0.56 ± 0.24 ng/ml). Besides, content of sodium to be determined by the k-zero method and the relative one are compared also. The results for determination of contents of 8 elements in the human samples to be compared with those of other authers are shown that this method has had confidence, and it could be applied routinely in determination of contents of multi-elements.

scholarly journals Determination of Cobalt in Seawater Using Neutron Activation Analysis after Preconcentration by Adsorption onto γ-MnO2 Nanomaterial

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Van-Phuc Dinh ◽  
Ngoc-Chung Le ◽  
Ngoc-Tuan Nguyen ◽  
Quang-Thien Tran ◽  
Van-Dong Nguyen ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Research Reactor ◽  
Nuclear Research ◽  
Adsorption Efficiency ◽  
Experiment Data ◽  
Factors Affecting ◽  
Nuclear Research Reactor

The γ-MnO2 nanomaterial has been used to adsorb cobalt in the seawater at Phan Thiet City, Binh Thuan Province, Vietnam. Its concentration is determined by using the neutron activation analysis (NAA) method at the Dalat nuclear research reactor. Factors affecting the uptake of cobalt on the γ-MnO2 material such as the pH, adsorption time, and initial cobalt(II) concentration are investigated. The irradiated experiment data are calculated using the K0-Dalat program. The results obtained show that the trace dissolved cobalt in Phan Thiet seawater is found equal to 0.25 ± 0.04 μg/L (n=5, P=95%) with the adsorption efficiency being higher than 95% (n=4, P=95%).

scholarly journals Determination of selenium in biological materials by short-time neutron activation analysis using ⁷⁷ᵐSe at the Dalat research reactor

2014 ◽  
Vol 4 (3) ◽  
pp. 36-42
Author(s):  
Van Doanh Ho ◽  
Quang Thien Tran ◽  
Thi Sy Nguyen ◽  
Nhi Dien Nguyen
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Half Life ◽  
Nuclear Research ◽  
Biological Materials ◽  
Standard Reference Materials ◽  
Nuclear Research Institute ◽  
Analysis Technique

A rapid neutron activation analysis technique for determination of the concentration of selenium in biological materials using short-lived radionuclide 77mSe (half-life = 17.4 seconds) has been developed at Dalat Nuclear Research Institute (DNRI). The technique is very simple and rapid. It involves irradiation of a sample for 20 s, decay for 20 s and counting for 20 s. The accuracy of the method has been evaluated by analyzing a number of biological standard reference materials of varied selenium levels. An agreement between measured and certified values was acceptable in regarding to the deviation of the above mentioned two values within 8 percent. The result shows that the utilization of short-lived radionuclide 77mSe is more useful in comparison with long-lived radionuclide 75Se (half-life = 120 days). In addition, it is suggested that a further study for cyclic irradiations should be done in order to enhance the detection limit of the determination of the short-lived radionuclide 77mSe.

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