Interference from uranium fission products in the determination of rare earths, zirconium and ruthenium by instrumental neutron activation analysis in rocks and minerals

Gouveia, M. A.; Prudêncio, M.I.; Freitas, M. C.; Martinho, E.; Cabral, J. M. P.

doi:10.1007/bf02039805

Cited by 30 publications

(12 citation statements)

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“…A long irradiation time (7 hr) was performed in the core grid of the Portuguese Research Reactor at a thermal flux of 3.34 × 10 12 n cm -2 s -1 ; φ epi /φ th = 1.4%; φ th /φ fast = 12.1. Corrections for the spectral interference from uranium fission products in the determination of Ce and Nd were carried out according to Gouveia et al (1987). Relative precision and accuracy were better than 5%.…”

Section: Inaa and Xrdmentioning

confidence: 99%

Radiocarbon and Blue Optically Stimulated Luminescence Chronologies of the Oitavos Consolidated Dune (Western Portugal)

et al. 2007

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ABSTRACT. The dune of Oitavos, the underlying paleosol, and Helix sp. gastropod shells found within the paleosol were dated using a combination of radiocarbon and blue optically stimulated luminescence (OSL). The organic component of the paleosol produced a significantly older age (~20,000 cal BP) than the OSL age measurement (~15,000 yr), while 14 C age measurements on the inorganic component and the gastropods produced ages of ~35,000 yr and ~34,000 yr, respectively. Rareearth element analyses provide evidence that the gastropods incorporate geological carbonate, making them an unreliable indicator of the age of the paleosol. We propose that the 14 C age of the small organic component of the paleosol is also likely to be unreliable due to incorporation of residual material. The OSL age measurement of the upper paleosol (~15,000 yr) is consistent with the age for the base of the dune (~14,500 yr). The younger OSL age for the top of the dune (~12,000 yr) suggests that it was built up by at least 2 sand pulses or that there was a remobilization of material at the top during its evolution, prior to consolidation.

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Section: Inaa and Xrdmentioning

confidence: 99%

Radiocarbon and Blue Optically Stimulated Luminescence Chronologies of the Oitavos Consolidated Dune (Western Portugal)

et al. 2007

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“…Individual samples are prepared for long irradiations together with reference standard samples (GSD-9 and GSS-1) from the Institute of Geophysical and Geochemical Prospecting (IGGE). Reference values are obtained from the data tabulated by Govindaraju (1994).…”

Section: Methodsmentioning

confidence: 99%

“…Cluster analysis also defines the existence of three chemically distinct samples from the QR workshop. Other statistical approaches (box-and-whisker plot graphs, PCA) point to the same distinct samples, representing one sample of each analysed typology: (i) QR3 (A51c) Initially, on the basis of typological evidence, we tried to identify eventual chemical differences according to this criterion, but all of the specimens appeared to be compositionally quite similar, and had proven almost indistinguishable in earlier studies (Cabral et al, 1993(Cabral et al, -1994Cabral et al, 2002). Even considering some 'overlap' in the chemical classification of QR samples, because a clear separation is not to be expected in the statistical analysis of chemical data, further studies (Dias et al, 2001) emphasize the possibility of slightly differentiating L9 amphorae from those belonging to the Almagro 51c typology, especially according to the iron enrichment and the higher chemical homogeneity.…”

Section: Quinta Do Rouxinol Workhopmentioning

confidence: 99%

“…Archaeometric studies of amphorae from the PC and QR Tagus production centres in comparison with a Sado basin production centre (Herdade do Pinheiro -HP) have already been performed, including a chemical characterization by instrumental neutron activation analysis (INAA) (Cabral and Gouveia, 1984;Cabral et al, 1993Cabral et al, -1994Cabral et al, , 1996Cabral et al, , 2000Cabral et al, , 2002Prudêncio et al, 2003;Dias and Prudêncio, 2007). Some of these works emphasize the difficulty in distinguishing amphorae produced with similar raw materials from the Tertiary Tagus-Sado basin.…”

Section: Introductionmentioning

confidence: 99%

“…Following an additional four-week decay, the samples are counted again for 2 hours and 30 minutes in the low and high energy detectors, yielding the measurement of the following long-lived elements: Fe, Sc, Cr, Co, Zn, Rb, Sb, Cs, Ba, Zr, Ce, Nd, Eu, Tb, Yb, Lu, Hf, Ta and Th. Corrections were carried out for spectral interference from uranium fission products in the determination of barium, rare earth elements (REE) and zirconium (Gouveia et al, 1987;Martinho et al, 1991). Relative precision and accuracy are, in general, within 5%, and occasionally within 10%.…”

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confidence: 99%

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Chemical tracers of Lusitanian amphorae kilns from the Tagus estuary (Portugal)

Dias

Prudêncio

Gouveia

et al. 2010

Journal of Archaeological Science

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a b s t r a c tIn this paper, the characterization of Roman amphorae from the Porto dos Cacos (PC) and Quinta do Rouxinol (QR) workshops, in the Tagus estuary, dating to a period between the 1st and 5th century AD was carried out on the basis of instrumental neutron activation analysis data on 260 amphorae fragments, together with mineralogical compositional studies obtained by X-ray diffraction.Special attention was devoted to the study of the Dressel 14, Almagro 50/51c and Lusitana 3/9 amphorae in an attempt to establish whether or not it is possible to establish any correlation between the composition and typology, and between and within the production centres studied.A description of the geochemical patterns associated with each production centre was first carried out separately, followed by a discussion comparing the two centres situated in the same sedimentary basin, identifying diagnostic chemical tracers for each one; also, in certain cases, a relative correlation with the typology was achieved. Both the definition of reference groups and the attribution of amphorae to their workshop origin relied on the use of chemometric techniques for data structure analysis, coupled with geochemical data analysis, especially regarding trace element data and its geochemical behaviour and distribution according to the geological environment of the region.This approach complements and reinforces the conclusions drawn from typological and archaeological analyses. Considering the two kiln sites studied, we may talk of the production of two types of Roman amphorae in the lower Tagus, with the establishment of compositional groups defined according to their corresponding chemical signatures. The products of the PC workshop are characterized by high concentrations of Co, As and U, and low concentrations of Fe, Zn, Sb, Rb, K; QR workshop amphorae show instead higher concentrations of Fe, Sb, and also of Rb and Zn, and lower amounts of U.These results make it possible to understand the crucial importance of the lower course of the Tagus River within the framework of the analysis of the economy of the estuary at the time. This, in turn, may lead to a better understanding of production and trade within Lusitania and also with other Roman provinces.

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Determination of hafnium and zirconium in geological materials by neutron activation analysis

Lins

Saiki

1997

J Radioanal Nucl Chem

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Interference from uranium fission products in the determination of rare earths, zirconium and ruthenium by instrumental neutron activation analysis in rocks and minerals

Cited by 30 publications

References 5 publications

Radiocarbon and Blue Optically Stimulated Luminescence Chronologies of the Oitavos Consolidated Dune (Western Portugal)

Radiocarbon and Blue Optically Stimulated Luminescence Chronologies of the Oitavos Consolidated Dune (Western Portugal)

Chemical tracers of Lusitanian amphorae kilns from the Tagus estuary (Portugal)

Determination of hafnium and zirconium in geological materials by neutron activation analysis

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