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Analytical Methods : Advancing Methods... Oct 2021The traditional library least squares approach (LLS) is affected by the inconsistency of the statistical uncertainties of different channels in a gamma spectrum, which...
The traditional library least squares approach (LLS) is affected by the inconsistency of the statistical uncertainties of different channels in a gamma spectrum, which leads to large fluctuations in the analysis results. This work proposes a weighted library least squares approach (WLLS) that uses the square root of the count to weight the regression objective function and has implemented a verification experiment based on Prompt Gamma Neutron Activation Analysis (PGNAA). The results showed that, after weighing using the square root of the count, the fluctuation level of statistical uncertainty in the spectrum was reduced from 44.34 to 2.25. After the analysis of the WLLS approach, the average standard deviation of the results was reduced to at least 0.37 times that of the LLS approach.
Topics: Gamma Rays; Least-Squares Analysis; Neutron Activation Analysis
PubMed: 34580692
DOI: 10.1039/d1ay01319j -
Journal of AOAC International Jul 2017The botanical origin of seven types of Slovenian honey was investigated by analysis of their elemental content using k0-instrumental neutron activation analysis. A total...
The botanical origin of seven types of Slovenian honey was investigated by analysis of their elemental content using k0-instrumental neutron activation analysis. A total of 28 representative samples were collected from beekeepers all over Slovenia in 2 consecutive years. Nineteen of the 37 elements measured were present in amounts above their LOD. The present study suggests that the determination of only alkali elements might be sufficient for the classification of Slovenian honeys according to their botanical origin. Linden and multifloral honeys can be differentiated on the basis of Na content. The differentiation of forest, spruce, and fir honeys is possible on the basis of differences in Cs, K, and Rb content. The difference between Na and Rb content can be used as a discriminating tool between light and dark honeys, because light honeys (black locust, linden, and multifloral) contained more Na than Rb, whereas it was the opposite for dark honeys (chestnut, forest, spruce, and fir). Statistically significant correlations were found between K and Rb and between K and Cs content. This study represents a considerable step in filling the knowledge gap concerning both the determination of elements present in low concentrations and the botanical origin of Slovenian honey.
Topics: Honey; Neutron Activation Analysis; Slovenia
PubMed: 28534467
DOI: 10.5740/jaoacint.17-0146 -
Biological Trace Element Research 1990Charged-particle activation analysis offers a number of interesting possibilities for the determination of trace elements in biological material. It allows the...
Charged-particle activation analysis offers a number of interesting possibilities for the determination of trace elements in biological material. It allows the determination of those elements that are difficult or impossible to determine by neutron activation, such as Li, B, Al, Si, V, Cr, Ni, Cd, Sn, Tl, and Pb. Up to now, protons have been successfully applied to samples of both vegetal and human origin. A number of difficulties have to be overcome, one of which is excessive heating of the samples owing to the limited range of the charged particles, thus giving rise to a high energy deposition in a small volume. Moreover, the sample composition has to be known to allow the calculation of the range of the particles. An interesting alternative has been proposed using an internal standard together with a standard additions procedure. Proton activation analysis was tested on a wide variety of reference materials, giving evidence that accurate results can be obtained for many trace elements, even when applying a purely instrumental method. Thus, the method can also be applied in the certification of reference materials, since nuclear methods are independent of chemical properties of the sample.
Topics: Activation Analysis; Animals; Hot Temperature; Humans; Protons; Radioisotopes; Reference Standards; Trace Elements
PubMed: 1704711
DOI: 10.1007/BF02992665 -
Lekarska Veda V Zahranici Dec 1963
Review
Topics: Activation Analysis; Biology; Chemistry Techniques, Analytical; Chromatography; Medicine; Neutron Activation Analysis; Radiometry
PubMed: 14115038
DOI: No ID Found -
The Journal of Biological Chemistry Aug 1961
Topics: Ions; Manganese; Neutron Activation Analysis
PubMed: 13732628
DOI: No ID Found -
Infusionstherapie (Basel, Switzerland) Apr 1990
Review
Topics: Activation Analysis; Blood Proteins; Body Composition; Humans; Multiple Trauma; Neutron Activation Analysis; Nutritional Requirements; Parenteral Nutrition, Total; Shock, Septic
PubMed: 2119346
DOI: 10.1159/000222546 -
International Journal of Radiation... 1990Four kinds of gallstones from 40 patients have been analyzed for the presence of a total of 18 elements by instrumental neutron activation analysis. Of these elements,...
Four kinds of gallstones from 40 patients have been analyzed for the presence of a total of 18 elements by instrumental neutron activation analysis. Of these elements, Ca, Mg, Fe, Co, Zn, Na, and Cl are found in the core of all types of stones. The differences in elemental composition of the various types of stones as well as the differences in the cross-sectional layers of stones are statistically evaluated.
Topics: Cholelithiasis; Elements; Humans; Neutron Activation Analysis
PubMed: 1963421
DOI: 10.1016/0883-2889(90)90209-y -
Radioisotopes Nov 1984
Review
Topics: Activation Analysis; Aerosols; Air Pollutants; Background Radiation; Dust; Elements; Japan; Neutron Activation Analysis; Particle Size; Spectrometry, X-Ray Emission
PubMed: 6395215
DOI: 10.3769/radioisotopes.33.11_814 -
Acta Radiologica May 1956
Topics: Activation Analysis; Chemistry Techniques, Analytical; Ions; Isotopes
PubMed: 13339473
DOI: 10.3109/00016925609171356 -
South African Medical Journal =... Feb 1975
Topics: Activation Analysis; Dental Calculus; Dental Enamel; Dentin; Esophageal Neoplasms; Hair; Half-Life; Humans; Kwashiorkor; Neutron Activation Analysis; Radioisotopes; Scintillation Counting; Spectrometry, Gamma; Trace Elements
PubMed: 1124458
DOI: No ID Found