Rare earths and other chemical elements determined by neutron activation analysis in new reference USGS materials: carbonatite, nephelinite, syenite, granite, stream sediment and marine shale

2021 ◽  
Author(s):  
Rosa Marques ◽  
Maria I. Prudêncio ◽  
Dulce Russo
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Rare Earths ◽  
Chemical Elements ◽  
Stream Sediment ◽  
Marine Shale

Determination of Trace Elements in Opium by Means of Activation Analysis

1963 ◽  
Vol 1 (3) ◽  
Author(s):  
Alexis C. Pappas ◽  
Jorolf Alstad ◽  
Gulbrand Lunde
Keyword(s):  
Trace Elements ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Rare Earths ◽  
Gold Content ◽  
The Individual ◽  
Lanthanide Content ◽  
Different Origin

SummaryMany methods have been advocated for the determination of the origin of opium, but so far no research has been reported on the possibilities of such studies by means of radiochemical methods applied to the opium ash.In the present investigation the gold and lanthanide content in samples of opium ash has been studied using neutron activation analysis. The gold content was found to vary from about 0,5 to 10 ppm and the total rare earths content from about 20 to 150 ppm. Large variations are found in the distribution pattern of the individual rare earths in opium samples from different origin. The results are discussed and indicate that activation analysis may be used to indentify the origin of opium samples.

Neutron activation analysis of bald eagle feathers: analytical precision and sources of sampling variation

1985 ◽  
Vol 63 (12) ◽  
pp. 2707-2718 ◽  
Author(s):  
Gary R. Bortolotti ◽  
Jon C. Barlow
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Chemical Elements ◽  
The Body ◽  
Bald Eagle ◽  
Haliaeetus Leucocephalus ◽  
Bald Eagles ◽  
Chemical Profiles ◽  
Significant Patterns

Instrumental neutron activation analysis was used to investigate the feather chemistry of wild and captive bald eagles (Haliaeetus leucocephalus). This paper documents variation that may be attributable to method of feather collection, laundering of samples, and precision of the analysis, as well as the variability within and among feathers from different locations on the body of individual birds. For most samples, reliable estimates could be made of the concentrations of bromine, magnesium. manganese, sodium, vanadium, aluminum, chlorine, calcium, and sulphur. Iodine and copper were detected but could not be measured precisely. There were highly significant patterns of variation along the length of a single feather for most chemical elements. The vane and calamus portions of feathers differed in chemical composition and the concentrations of the elements in the two parts were not correlated. Feathers belonging to the same molt but collected several months apart had similar chemical profiles. Variation within an individual feather and among feathers from different parts of the body necessitates rigorous consistency in the method of sampling feathers. Possible explanations for the observed patterns of elemental composition are discussed.

Determination of chemical elements in magnesium-based materials by neutron activation analysis

2021 ◽  
Vol 9 (1A) ◽  
Author(s):  
Caio Almeida Justino Silva ◽  
Lilian Ninoska Muriel Braguin ◽  
Jesualdo Luiz Rossi ◽  
Isolda Costa ◽  
Mitiko Saiki
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Chemical Elements

Instrumental neutron activation analysis of Marrubium vulgare L., a valuable medicinal herb

2016 ◽  
Vol 104 (4) ◽  
Author(s):  
Bouzid Nedjimi ◽  
Brahim Beladel
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Chemical Elements ◽  
Medicinal Herb ◽  
Marrubium Vulgare ◽  
Instrumental Neutron Activation

AbstractTwenty two chemical elements were identified by Instrumental neutron activation analysis in

Corn Cultivation for Silage: Evaluation of Elemental Composition in the Soil and Plants by Neutron Activation Analysis

2019 ◽  
pp. 1-9
Author(s):  
Wellington Ferrari Da Silva ◽  
Maria Ângela de B. C. Menezes ◽  
Douglas José Marques
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Neutron Flux ◽  
Technology Development ◽  
Chemical Elements ◽  
Radioactive Isotopes ◽  
Flux Monitor ◽  
Agricultural Pesticides ◽  
Adequate Management

Corn cultivation for silage requires special soil management and constant applications of fertilizers and agricultural pesticides to achieve satisfactory yield levels. This study was carried out on a farm that has grown corn for several years. The soil does not have adequate management in terms of fertility and fertilization. The matrices collected were soil, roots, leaves and grains in a corn silage area to investigate which chemical elements are present and their concentrations. The neutron activation analysis (NAA) by k0-standardization method was applied on elemental concentration determination. In this technique, the sample is submitted to a neutron flux, in order to produce radioactive isotopes of the nuclei present in the original sample. In the k0 method, the sample is irradiated together with a neutron flux monitor, usually gold (Au), in the same irradiation position and standards of the interested element are not necessary. Several samples can be irradiated simultaneously when stacked inside the irradiation vessel, intercalated with neutron flux monitors. The irradiations were carried out in the TRIGA MARK I IPR-R1 research reactor at Nuclear Technology Development Centre/Brazilian Commission for Nuclear Energy (CDTN / CNEN). In the analysis, As, Ba, Br, Ca, Ce, Co, Cr, Cs, Cu, Eu, Fe, Hf, K, La, Mo, Na, Nd, Rb, Sb, Sc, Sm, Ta, Tb, Th, U, Yb and Zn were identified in the samples. Although the site studied lacks adequate management of soil fertility and fertilization, Ca, Cu, K, Mo and Zn were determined and their presences are important because they are essential for corn development. Adequate content for the cultivation of silage corn were verified by assessing these nutrients and their translocation in the plant.

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