Gamma ray spectrometric methods in uranium exploration-application and interpretation

Killeen, P G

doi:10.4095/106049

Cited by 47 publications

(35 citation statements)

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“…Em termos gerais, as concentrações dos três elementos são próximas às concentrações médias esperadas para carbonatos, que, segundo Killeen (1979), são de 0,3%, 2ppm e 3ppm de K, U e Th, respectivamente. As concentrações médias para cada uma das faces (Tabela 3) aproximam-se desses valores, com exceção do Th, que apresentou valores duas vezes acima da média.…”

Section: Espectrometria De Raios Gamaunclassified

Análise geológica e petrofísica de um bloco de travertino como análogo de reservatório de hidrocarbonetos

Basso

Kuroda

Vidal

2017

Geol. USP. Sér. Cient.

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ResumoOs carbonatos de origem microbialítica vêm ganhando espaço na geologia do petróleo visto a existência de diversos reservatórios compostos por essas litologias nos campos produtores do Pré-Sal. Dentre as rochas propostas como análogas aos microbialitos estão os travertinos, os estromatólitos e as tufas calcárias. Neste trabalho foi realizado o estudo de parâmetros geológicos, petrofísicos e geofísicos de um bloco de travertino de dimensões 1,60 x 1,60 x 2,70m, de 21,2 toneladas e disponível no Centro de Estudos de Petróleo (CEPETRO) na Universidade Estadual de Campinas. O bloco de origem italiana, denominado T-block, corresponde ao volume elementar representativo da formação de origem e permitiu o estudo em uma escala intermediária entre a escala de afloramento e a amostra de mão. Foram realizados ensaios de permeabilidade, medições de espectrometria de raios gama e obtenção da porosidade superficial por meio de análise de imagens. Modelos foram gerados a partir dos dados obtidos e então associados à geologia descritiva do bloco. Foi registrado um padrão de redução de permeabilidade, porosidade e concentração dos elementos potássio (K), urânio (U) e tório (Th), seguindo um gradiente em direção ao topo do T-block que acompanha a redução do grau de desenvolvimento da fábrica da rocha.Palavras-chave: Travertinos; Análise Petrofísica; Análise de Permeabilidade. AbstractMicrobialitic limestones are gaining space in petroleum geology due to the existence of many reservoirs composed of these lithologies in the pre-salt producing fields. Travertine, calcareous tufa and stromatolites figure among the rocks proposed as analogous for the microbialitic rocks. This work conduces the study of geological, petrophysical and geophysical parameters of a travertine block measuring 1,60 x 1,60 x 2,70 m, weighing 21,2 tons and available in the Centro de Estudo do Petróleo (CEPETRO) at the Universidade Estadual de Campinas. The Italian block, named T-block, corresponds to the representative elementary volume of its original formation and allows the study in an intermediate scale between the hand sample and the outcrop scale. Permeability tests and gamma ray spectrometry measurements were conducted and the porosity was calculated by image analysis. Models were generated from the obtained data and then associated with descriptive geology of the block. A reduction in permeability, porosity and concentration of elements potassium (K), uranium (U) and thorium (Th) was recorded, following a gradient towards the top of the T-block accompanying the reduction in the degree of development of the rock fabric.

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Section: Espectrometria De Raios Gamaunclassified

Análise geológica e petrofísica de um bloco de travertino como análogo de reservatório de hidrocarbonetos

Basso

Kuroda

Vidal

2017

Geol. USP. Sér. Cient.

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“…Some classical works determine ranges of concentration of radioelements. Killeen (1979) classifies chemical sedimentary rocks, indirectly applicable to banded iron formations, with intervals of K, eU and eTh, respectively, between 0.02-8.4%, 0.03-26.7 ppm and 0.03-132.0 ppm. Boyle (1982) presents average contents of eU and eTh for banded iron formations (2.0 ppm and 3.0 ppm respectively).…”

Section: Physical Properties Of Iron Ore and Host Rocksmentioning

confidence: 99%

The Use of Alternative Methods for Differentiation of Banded Iron Formations and Iron Ore in the Body N4ws, Serra Norte – Caraj´as Mineral Province

Nascimento¹,

Silva²,

Toledo³

et al. 2016

Rev. Bras. Geof.

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ABSTRACT. The use of non-traditional geophysical methods is becoming increasingly common in activities involving iron ore, as the increasing ore demand intensified the competition in the international market. This motivated us to integrate the physical properties of the rocks to better understand the relations of the iron ore with the proto-ore and host rocks. The work was conducted in N4WS body, Serra Norte, Carajás Mineral Province (CMP), located in the state of Pará, Brazil. The Carajás Mineral Province hosts some of the largest world-class iron ore deposits operated by Vale S.A. The results of airborne magnetic data showed that the mineralized bodies previously mapped are not directly linked to the high gradients observed in the amplitude of the analytic signal. This response is related to the proto-ore, constituted by jaspilites with low values of K, eU and eTh. Measurements of the magnetic susceptibility and gamma radiation emission in drill holes were satisfactory. There was a clear differentiation between iron ore, jaspilites and mafic rocks, mainly in the magnetic susceptibility parameter. The gamma-ray results from radioelements separated iron formations and associated mineralization from the adjacent mafic rocks. The use of the non-supervised classification k-means was useful for distinguishing between jaspilites within the same package and to show anomalous areas not previously mapped. The integration of rock physical properties, geological data and airborne geophysical data produced excellent results. There was a direct correlation between what was measured and what was observed in situ at the surface. Thus, it was possible to individualize the lithotypes in the N4WS using the physical properties. This confirms the feasibility of using these methods as an alternative to the currently used tools for iron ore exploration, with the potential to increase the efficient use of human and financial resources investments.Keywords: multisource data integration, jaspilites, gamma-ray spectrometry, rock physical properties. RESUMO.A utilização de métodos geofísicos não tradicionais está se tornando cada vez mais comum em atividades que envolvem o minério de ferro, uma vez que a alta demanda impulsiona o mercado internacional. Este avanço nos leva a integrar a assinatura das propriedades físicas de rocha para melhor entendimento do minério de ferro com o protominério e suas rochas adjacentes. O trabalho foi realizado no corpo N4WS, Serra Norte, Província Mineral de Carajás (CMP), localizado no estado do Pará. A Província Mineral de Carajás abriga alguns dos maiores depósitos de minério de ferro de classe mundial, todos explorados pela Vale S.A. Os resultados dos dados aeromagnéticos mostraram que os corpos mineralizados previamente mapeados não possuem uma ligação direta com os gradientes elevados observados na amplitude do sinal analítico. Esta respostaé relacionada ao protominério, constituído por jaspilitos de assinatura gamaespectrométrica relacionados aos baixos valores de K, eU e eTh. As respostas das medi...

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“…The average of the background counts was then subtracted from the sample spectrums. Th decay series is very important (Bowie et al, 1971;Killen, 1979).…”

Section: Radioactivity Measurements and Dose Calculationsmentioning

confidence: 99%

Microtus guentheri (Danford & Alston, 1880) (Rodentia: Cricetidae)as a biomonitor for radionuclides in Mersin Province of Turkey

Yavuz¹,

Özmen²,

Tunç³

et al. 2016

Turk J Zool

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The purpose of this study was to use Microtus guentheri to monitor gamma radioactivity levels in the Mersin region of southern Mediterranean Turkey, where the nation's first nuclear power plant will be built. Prior to our study there was no information available on the radioactivity levels of living organisms in this region. Concentrations of 226 Ra, 232 Th, 40 K, and 137 Cs were determined by gamma spectrometry using a high-purity germanium detector and our results were compared with the associated dose rates in the world. The average value of gamma dose rates obtained in this study (7.59 nGy h -1 ) was in the range of 3.61-20.12 nGy h -1 , which is within the global range of values for soil (10-200 nGy h -1 ). The calculated annual effective dose equivalent with an average value of 9.30 mSv and the radium equivalent activity index with an average value of 15.13 Bq/kg were lower than the worldwide averages for soil of 460 mSv and 370 Bq/kg, respectively. The annual gonadal equivalent dose and excess lifetime cancer risk averaged 386.74 µS/y and 0.93, respectively. There was a strong positive correlation between increasing altitude and 40 K activity (r = 0.996, P < 0.0001). The data presented in this study are baseline data that will be useful in monitoring for fugitive radiation associated with the nuclear power plant planned for the Mersin region.

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Gamma ray spectrometric methods in uranium exploration-application and interpretation

Cited by 47 publications

References 0 publications

Análise geológica e petrofísica de um bloco de travertino como análogo de reservatório de hidrocarbonetos

Análise geológica e petrofísica de um bloco de travertino como análogo de reservatório de hidrocarbonetos

The Use of Alternative Methods for Differentiation of Banded Iron Formations and Iron Ore in the Body N4ws, Serra Norte – Caraj´as Mineral Province

Microtus guentheri (Danford & Alston, 1880) (Rodentia: Cricetidae)as a biomonitor for radionuclides in Mersin Province of Turkey

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