scholarly journals Large Sample Neutron Activation Analysis of a Peruvian Pottery Artifact

2019 ◽  
Vol 21 ◽  
pp. 20
Author(s):  
T. Vasilopoulou ◽  
I. E. Stamatelatos ◽  
E. Montoya ◽  
P. Bedregal ◽  
I. Tsalafoutas ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Elemental Concentration ◽  
Gamma Ray ◽  
Complex Geometry ◽  
Correction Factors ◽  
Energy Agency ◽  
Large Sample ◽  
Intercomparison Study

The present work was carried out within the first Large Sample Neutron Activation Analysis (LSNAA) intercomparison study organized under the auspices of the International Atomic Energy Agency (IAEA). Replicates of a Peruvian pottery object, representing a Pre-Columbian archaeological artifact, were prepared by the Instituto Peruano de Energia Nuclear (IPEN) and distributed to 10 laboratories with LSNAA capa- bilities. The LSNAA results were compared against values derived by conventional Instrumental Neutron Activation Analysis (INAA) on small amounts of the material used to produce the test object. The results of the intercomparison study will be presented in detail in a separate publication. In this work, the LSNAA methodology developed at ’Demokritos’ for analysis of large and irregular shaped objects is discussed. An accurate description of the complex geometry of the object was obtained by Computerized Tomography X-ray scanning. The correction factors required for the effects of neutron self-shielding and gamma-ray self-attenuation within the large sample material were derived by Monte Carlo simulations using MCNP code. The results of the study showed that LSNAA provides elemental concentration values with a satisfactory agreement against values obtained by conventional INAA. Therefore, LSNAA is a technique suitable for the purpose of analysis of intact pottery objects of irregular shape for archaeological studies.

Correction factors for the gamma attenuation effects in large sample neutron activation analysis

2010 ◽  
Vol 287 (2) ◽  
pp. 513-517 ◽  
Author(s):  
Hai-Qing Zhang ◽  
Bang-Fa Ni ◽  
Wei-Zhi Tian ◽  
Gui-Ying Zhang ◽  
Dong-Hui Huang ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Correction Factors ◽  
Large Sample

Elemental analysis of medicinal plants from different sites by instrumental neutron activation analysis

2016 ◽  
Vol 5 (03) ◽  
pp. 4892 ◽  
Author(s):  
Ratna Raju M.* ◽  
Madhusudhana Rao P. V. ◽  
Seshi Reddy T. ◽  
Raju M. K. ◽  
Brahmaji Rao J. S. ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Medicinal Plants ◽  
Neutron Activation ◽  
Gamma Ray ◽  
Elemental Content ◽  
Soil Composition ◽  
Gamma Ray Spectrometer ◽  
Instrumental Neutron Activation

A study was undertaken to evaluate the inorganic elements for humans in two Indian medicinal plants leaves, namely Sphaeranthus indicus, and Cassia fistula by Instrumental Neutron Activation Analysis (INAA). INAA experiment was performed by using 20 kW KAMINI Reactor at Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam. The emitted gamma rays were measured using gamma ray spectrometer. The concentrations of Al, Br, Ca, Fe, K, La, Mg, Mn, Na, Sc, V and Zn were determined in the selected medicinal plants. The medicinal leaves are using in treatment of various important ailments. The elemental content in selected medicinal leaves is various proportions depending on the soil composition, location of plant specimen and the climate in which the plant grows.

scholarly journals TL, OSL and C-14 dating results of the sediments and bricks from mummified nuns' grave

2012 ◽  
Vol 84 (2) ◽  
pp. 237-244 ◽  
Author(s):  
Diego R.G. Tudela ◽  
Sonia H. Tatumi ◽  
Márcio Yee ◽  
Silvio L.M. Brito ◽  
José L. Morais ◽  
...  
Keyword(s):  
Eighteenth Century ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Gamma Ray ◽  
The State ◽  
Osl Dating ◽  
Annual Dose ◽  
Dose Rates ◽  
Gamma Ray Spectroscopy

This paper presents the results of TL and OSL dating of soil and fragments of bricks from a grave, which was occupied by two mummified nuns, found at "Luz" Monastery, located in the state of São Paulo, Brazil. The TL and OSL ages were compared to C-14 dating ones obtained from bone collagens of the mummies. The majority of the ages is related to the eighteenth century. The gamma-ray spectroscopy was used to evaluate natural radioisotope concentrations in the samples, and by using these concentrations the annual dose rates, from 3.0 to 5.3 Gy/kyr, were obtained. Neutron activation analysis was performed and the radioisotope contents results are in agreement with those obtained by gamma-ray spectroscopy. The contents of U, Th and Ce elements were higher than those found in usual sediments.

Interferences in instrumental neutron activation analysis by threshold reactions and uranium fission for miniature neutron source reactor

2013 ◽  
Vol 101 (9) ◽  
pp. 601-606
Author(s):  
M. Wasim
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Neutron Flux ◽  
Neutron Source ◽  
Fission Products ◽  
Correction Factors ◽  
Uranium Fission ◽  
Instrumental Neutron Activation

Summary Miniature neutron source reactors (MNSR) are known for their stable neutron flux characteristics and are mostly employed for neutron activation analysis (NAA). Interfering reactions are sometimes observed in instrumental neutron activation analysis (INAA). Failure to correct for these interferences produces significant systematic positive errors. This paper provides correction factors for the interferences caused by the threshold reactions and fission products of 235U. These factors were calculated by using the experimentally determined thermal, epithermal and fast neutron flux and epithermal neutron flux shape factor and the nuclear data from the literature using the Høgdahl convention. Correction factors were calculated for (n, p) and (n, α) reactions for the most commonly observed radionuclides in INAA. Similarly, correction factors for uranium fission were calculated for 9 elements (Ce, Ba, La, Mo, Nd, Pd, Ru, Sm and Zr). The correction factors were validated by analyzing different materials. A comparison of uranium fission factors with those published in the literature showed a good agreement except for 97Zr, 99Mo and 131Ba which is due to difference in the flux characteristics. In general, these factors can be used with confidence.

scholarly journals Large-sample neutron activation analysis in mass balance and nutritional studies

2018 ◽  
Vol 7 ◽  
Author(s):  
Albert Van de Wiel ◽  
Menno Blaauw
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Mass Balance ◽  
Small Samples ◽  
Attractive Alternative ◽  
Large Sample ◽  
Food Research ◽  
Low Concentrations ◽  
Nutritional Studies

AbstractLow concentrations of elements in food can be measured with various techniques, mostly in small samples (mg). These techniques provide only reliable data when the element is distributed homogeneously in the material to be analysed either naturally or after a homogenisation procedure. When this is not the case or homogenisation fails, a technique should be applied that is able to measure in samples up to grams and even kilograms and regardless of the distribution of the element. An adaptation of neutron activation analysis (NAA), called large-sample NAA, has been developed and proven accurate and may be an attractive alternative in food research and mass balance studies. Like standard NAA, large-sample NAA can be used to measure both toxic and trace elements relevant for nutrition.

Comparison of Adhesive Tapes by Neutron Activation Analysis

1967 ◽  
Vol 50 (2) ◽  
pp. 371-376
Author(s):  
J E Scott ◽  
C M Hoffman ◽  
M J Pro ◽  
H L Schlesinger
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Elemental Composition ◽  
Gamma Ray ◽  
Gamma Ray Spectrometry

Abstract Adhesive tapes were compared by nondestructive gamma-ray spectrometry. Results show that neutron activation analysis can he used to characterize tapes through their elemental composition. Differences between manufacturers as well as hatch-tobatch and in-batch variations can be measured by neutron activation analysis.

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