The development of the k0 method in Peru: Past, present and future perspectives

Montoya, Eduardo; Bedregal, Patricia; Mendoza, Pablo; Ubillús, Marco; Torres, Blanca; Cohen, I. M.

doi:10.1016/j.nima.2010.04.005

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…It can be seen that the isotopic composition corresponds to natural uranium, result expected in a dry environment. The INAA methods used at the authors' laboratory have been already validated [11,12] for the determination of the overall element composition. In connection with the specific determination of 238 U, a certified standard reference material (NIST SRM 1633b Coal Fly Ash) was analyzed together with the samples.…”

Section: Resultsmentioning

confidence: 99%

“…The determination of 238 U was carried out by k 0 -INAA, in the conditions described by the authors in previous works [11,12].…”

Section: Methodsmentioning

confidence: 99%

“…The present work deals with a new approach for simple, accurate and reliable determination of 234 U and 238 U activities in soils having low uranium concentration, which consists of a combined method with two steps: 1) Determination of the 238 U content by k 0 -based neutron activation analysis [11,12]; 2) Measurement of the 234 U/ 238 U relationship by α spectrometry after isolation and electrodeposition of the uranium extracted from a lixiviation with 6 M HCl. The possibility of using the second procedure is a direct derivation of the utilization of the first one: since the 238 U content is determined independently of the measurement by alpha spectrometry, there is no need of quantitative separations or alternative measurement of the chemical yield, this implying that the accomplishment of all chemical steps destined to assure similar chemical state for the tracer and the uranium species present in the sample are not necessary.…”

Section: Introductionmentioning

confidence: 99%

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A combined method of neutron activation analysis and radiometric measurements for 234U and 238U determination in soil samples of low uranium concentration

Montoya

Mendoza

Bedregal

et al. 2011

J Radioanal Nucl Chem

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Se ha desarrollado un método que combina el análisis por activación neutrónica instrumental y la espectrometría alfa de alta resolución, para la determinación de las actividades de 234 U y 238 U en muestras geológicas de bajo contenido de uranio. El contenido de 238 U se determina mediante análisis por activación neutrónica según el método del k sub cero, mientras que la relación 234 U / 238 U se mide mediante espectrometría alfa, después del aislamiento y electrodeposición del uranio extraído mediante una lixiviación con HCl 6M. La principal ventaja del método es la simplicidad de las operaciones químicas, incluyendo el hecho de que las etapas destinadas a asegurar el mismo estado químico para el trazador y las especies de uranio presentes en la muestra, no es necesaria. El método se ha aplicado a muestras de suelo de sitios de la costa norte del Perú. La concentración encontrada de uranio varía entre 3 a 40 mg/kg y la composición isotópica corresponde a uranio natural, con una incertidumbre de aproximadamente 10%.

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Section: Resultsmentioning

confidence: 99%

“…The determination of 238 U was carried out by k 0 -INAA, in the conditions described by the authors in previous works [11,12].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A combined method of neutron activation analysis and radiometric measurements for 234U and 238U determination in soil samples of low uranium concentration

Montoya

Mendoza

Bedregal

et al. 2011

J Radioanal Nucl Chem

View full text Add to dashboard Cite

show abstract

“…Briefly, the method consists of the simultaneous irradiation of a set of four or more bare monitors and the determination of the normalized specific experimental activities for each one, then for the most convenient pairs of monitors, a whole set of apparent values of f (α) as a function of (α) are generated by applying the equation [15]:…”

Section: -Materials and Methodsmentioning

confidence: 99%