scholarly journals Determination uranium in solutions by the method of neutron activation analysis with 252Cf radionuclide neutron source

2021 ◽  
pp. 5-5
Author(s):  
Sergei Ivannikov ◽  
Nikita Markin ◽  
Veniamin Zheleznov
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Neutron Source ◽  
Optimal Time ◽  
Analysis Method ◽  
Short Life ◽  
Wide Range ◽  
Neutron Activation Analysis Method

A determination option for 238U in solutions by the neutron activation analysis was investigated. A radionuclide treatment based on 252Cf was used as a neutron source. The limit for the determination of uranium using thermal neutrons of 0.1 mg L-1 was determined within the research framework. With the help of preliminary concentration of the sample via the evaporation method, it is possible to further reduce the detection limit by 2-5 times. It is defined that the optimal time for measuring the induced activity of the sample, when working with a short-life isotope of 239U, is 30 min. The influence of the effects of scattering and self-absorption of gamma radiation of the uranium line 74.6 keV on the results of the neutron activation analysis is determined. The studies conducted made it possible to determine uranium by the neutron activation analysis method in solutions of various compositions, in a wide range of concentrations.

Determination of selenium in roasted beans coffee samples consumed in Algeria by radiochemical neutron activation analysis method

2018 ◽  
Vol 106 (2) ◽  
pp. 141-146 ◽  
Author(s):  
Mohammed Messaoudi ◽  
Samir Begaa ◽  
Lylia Hamidatou ◽  
M’hamed Salhi
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Radiochemical Neutron Activation Analysis ◽  
Analysis Method ◽  
Coffee Beans ◽  
Ultra Trace ◽  
Neutron Activation Analysis Method ◽  
Activation Analysis Method

AbstractThe essential trace element selenium is a focus of attention due to its effects on human health, there being consequences of both its deficiency and excess. Due to the ultra-trace content of selenium, the neutron activation analysis method (NAA) is difficult to apply. We therefore made use of the radiochemical neutron activation analysis (RNAA) to determine Se at low level concentrations in several consumed food items in Algeria. A radiochemical procedure based on liquid–liquid separation was established in our laboratory. In this research we focused on the determination of selenium in two species of coffee: Arabica and Robusta. The accuracy of the method was assessed by analyzing the certified reference material NIST-SRM 1573a (tomato leaves). The results obtained show a selenium variation from 0.025 to 0.052 μg/g in coffee beans and an average yield of the separation of about 85%. The results of this study were compared with those obtained with samples from Brazilian, Caribbean, Indian and Kenyan coffee beans.

Neutron Activation Analysis of Selenium in Biological Samples

1969 ◽  
Vol 52 (5) ◽  
pp. 915-917
Author(s):  
J P F Lambert ◽  
O Levander ◽  
L Argrett ◽  
R E Simpson
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Half Life ◽  
Colorimetric Determination ◽  
Selenium Content ◽  
Analysis Method ◽  
Counting Error ◽  
Neutron Activation Analysis Method

Abstract The selenium content in tissues of rats fed chronically toxic levels of selenium was determined by neutron activation analysis. The results were highly dependent on the value of the 77mSe half-life used in the computations. The best half-life value was selected by comparing results for different values of half-life feith those from a colorimetric determination of identical samples. The neutron activation analysis method is rapid, nondestructive, and free of any chemical procedures. Selenium was determined at a 3 μg level with a counting error of ± 6% at the 95% confidence level.

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