Semi-empirical determination of detector absolute efficiency in INAA of voluminous samples

Alamin, M. B.; Spyrou, N. M.

doi:10.1007/bf02034465

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…NAA is a sensitive multielement analytical technique useful for performing both quantitative and qualitative analysis. The technique is most useful because of its reliability for accurate and precise determination of elemental concentrations in unknown materials (William, 1972;Clemente, 1976;Alamin and Spyrou, 1997).…”

Section: Determination Of U-238 Th-232 and K Concentrationsmentioning

confidence: 99%

Environmental 238U and 232Th concentration measurements in an area of high level natural background radiation at Palong, Johor, Malaysia

Ramli

Hussein

Wood

2005

Journal of Environmental Radioactivity

103

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Section: Determination Of U-238 Th-232 and K Concentrationsmentioning

confidence: 99%

Environmental 238U and 232Th concentration measurements in an area of high level natural background radiation at Palong, Johor, Malaysia

Ramli

Hussein

Wood

2005

Journal of Environmental Radioactivity

103

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“…Particularly, in the case of a buried volumetric source, it would difficult to construct calibration sources covering possible source shapes and dimensions for efficiency calibration Hence, the required efficiency of the detector has to be determined through an absolute method. The absolute efficiency e G at the 0.662 MeV photopeak would then be given by [14,15] …”

Section: Quantification Of Radioactivitymentioning

confidence: 99%

In-situ characterisation of a buried 137Cs source in the frame of nuclear forensics

Antoniou

Nicolaou

2015

J Radioanal Nucl Chem

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An approach is demonstrated, through simulations using MCNP, to characterise buried radioactive sources, in terms of their depth, radioactivity and location of their edges in the case of a volumetric one. The approach involves scanning of the sources with a collimated HPGe detector, positioned vertically and at an angle. The sought parameters to characterise the sources considered, were accurately reproduced. The approach was verified experimentally for 137 Cs cuboid and point buried sources. The parameters of interest were determined to within 22 % of the actual values.

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“…Pode ser mostrado que a atividade radiativa (A, ) de uma amostra que foi exposta a um fluxo de nêutrons, e sofreu capturas radiativas, é dada pela Equação 3.1 (Kuleff & Djingova, 1990;Alamin & Spyrou, 1997) (Suzuki & Hirai, 1992).…”

Section: Comentários Sobre As Pesquisas Arqueológicas De Xingóunclassified

Estudos arqueométricos de sítios arqueológicos do baixo São Francisco

Santos¹,

Munita²

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The study of the physical and chemical characteristics of the ceramics crafts, in association with historical and archaeological research, has allowed for the reconstruction of the cultural habits from ancient communities. The goal of this work was to study the chemical and mineralogical compositions of archaeological potteries collected from Justino, São José, Curituba, Saco da Onça, Porto Belo and Vitória Régia sites, located in Baixo São Francisco region, Sergipe state, Brazil. The use of the instrumental neutron activation analysis (INAA) and X-ray diffractometry (XRD), allowed the definition of compositional groups of potteries according to the chemical similarities of the ceramic paste, which reveals the composition of the raw materials utilized in the manufacturing process by prehistoric man, and the inference of the atmosphere and temperatures in which the potteries were burned. The outliers were identified by means of classic and robust Mahalanobis distance. The temper effect in the ceramic paste was studied by means of modified Mahalanobis filter. The results were interpreted by means of cluster analysis, principal components analysis and discriminant analysis. The ages of some potteries were determined by means of the thermoluminescence techniques. The results obtained in this work, in association with archaeological information, allowed for the identification of the ceramic groups relative to ceramist occupations at Justino Site and for the definition of the reference groups according to the chemical composition. The burning technology was established for some potteries and the relative ages among the compositional groups were determined by means of TL. Thus, this work provides contributions to the reconstmction of the prehistory of the communities which lived in the Baixo São Francisco region, and to the reconstitution of the general frame of the ceramist population from Brazilian Northeast.

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Semi-empirical determination of detector absolute efficiency in INAA of voluminous samples

Cited by 5 publications

References 10 publications

Environmental 238U and 232Th concentration measurements in an area of high level natural background radiation at Palong, Johor, Malaysia

Environmental 238U and 232Th concentration measurements in an area of high level natural background radiation at Palong, Johor, Malaysia

In-situ characterisation of a buried 137Cs source in the frame of nuclear forensics

Estudos arqueométricos de sítios arqueológicos do baixo São Francisco

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