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Juergen Heinrich Maar - One of the best experts on this subject based on the ideXlab platform.

  • almost a discovery henri gorceix the mining school of ouro preto the Monazite sand of bahia and the chemistry of didymium
    Substantia, 2018
    Co-Authors: Juergen Heinrich Maar
    Abstract:

    The chemical history of the supposed element didymium may well be characterised as a case of collecting empirical data in a period of “normal” science. But this element’s history also reveals little known facts of the history of chemistry in South America, such as the exploration and smuggling of Monazite Sands, and the difficult beginnings of scientific research and higher education in Brazil. Didymium is also a curious case: even after it was shown to be a mixture, it continued to be regarded as an element. This fact alone raises questions about the adequacy of scientific methodology at the time. In this paper, we consider the history of didymium, and determine how this history’s different facts and stories, set in Brazil’s rather unique historical and scientific context, intertwine thanks to the work of Claude Henri Gorceix.

  • Almost a Discovery – Henri Gorceix, the Mining School of Ouro Preto, the Monazite Sand of Bahia and the Chemistry of Didymium
    Firenze University Press, 2018
    Co-Authors: Juergen Heinrich Maar
    Abstract:

    The chemical history of the supposed element didymium may well be characterised as a case of collecting empirical data in a period of “normal” science. But this element’s history also reveals little known facts of the history of chemistry in South America, such as the exploration and smuggling of Monazite Sands, and the difficult beginnings of scientific research and higher education in Brazil. Didymium is also a curious case: even after it was shown to be a mixture, it continued to be regarded as an element. This fact alone raises questions about the adequacy of scientific methodology at the time. In this paper, we consider the history of didymium, and determine how this history’s different facts and stories, set in Brazil’s rather unique historical and scientific context, intertwine thanks to the work of Claude Henri Gorceix

S. K. Saha - One of the best experts on this subject based on the ideXlab platform.

  • Radiogenic heavy minerals in Chhatrapur beach placer deposit of Orissa, southeastern coast of India
    Journal of Radioanalytical and Nuclear Chemistry, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Konstantin V. Van, Debashish Sengupta, S. K. Saha
    Abstract:

    The beach placer deposit at Chhatrapur coast of Orissa state, southeastern coast of India, has a significant concentration of radiogenic heavy minerals. The average activity concentrations of radioactive elements such as 232Th, 238U and 40K were measured by gamma ray spectrometry using a HPGe detector, and found to be 2650±50, 400±30 and 120±30 Bq/kg, respectively, for the bulk sand samples. The activity concentrations in Monazite and zircon Sands are found to be 305,000±2000 and 2000±150 Bq/kg for the 232Th and 21,500±300 and 3450±250 Bq/kg for the 238U. Electron probe microanalysis results of Monazite Sands show the average ThO2 and UO3 concentrations to be 10.42 wt.%, and 0.32 wt.%, respectively. The major contributors for the enhanced level of radioactivity are Monazite and zircon Sands. These heavy mineral Sands were derived from the nearby source areas such as Eastern Ghats Group of rocks.

  • Geochemical studies of Monazite Sands of Chhatrapur beach placer deposit of Orissa, India by PIXE and EDXRF method
    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Debashish Sengupta, V. Vijayan, S. K. Saha
    Abstract:

    Abstract Geochemical characteristics of Monazite Sands of Chhatrapur beach placer deposit were studied by proton induced X-ray emission and energy dispersive X-ray fluorescence methods. The average concentrations of ThO 2 and UO 2 are found to be 10.18 and 0.26 wt.%, respectively. The average rare-earth elements (REE) content is 56.75 wt.% and they are rich in La, Ce and Nd. The most characteristic feature common to all Monazites is that the total REE content exceeds that of the actinides (U + Th). The chondrite-normalized REE distribution patterns of Monazite grains shows uniformly enriched light rare-earth element, which could be due to the preferential incorporation of lighter lanthanides. These Monazite Sands are derived from the granulite facies of metamorphic rocks such as khondalites and charnockites from Eastern Ghats Group of rocks.

A.k. Mohanty - One of the best experts on this subject based on the ideXlab platform.

  • Radiogenic heavy minerals in Chhatrapur beach placer deposit of Orissa, southeastern coast of India
    Journal of Radioanalytical and Nuclear Chemistry, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Konstantin V. Van, Debashish Sengupta, S. K. Saha
    Abstract:

    The beach placer deposit at Chhatrapur coast of Orissa state, southeastern coast of India, has a significant concentration of radiogenic heavy minerals. The average activity concentrations of radioactive elements such as 232Th, 238U and 40K were measured by gamma ray spectrometry using a HPGe detector, and found to be 2650±50, 400±30 and 120±30 Bq/kg, respectively, for the bulk sand samples. The activity concentrations in Monazite and zircon Sands are found to be 305,000±2000 and 2000±150 Bq/kg for the 232Th and 21,500±300 and 3450±250 Bq/kg for the 238U. Electron probe microanalysis results of Monazite Sands show the average ThO2 and UO3 concentrations to be 10.42 wt.%, and 0.32 wt.%, respectively. The major contributors for the enhanced level of radioactivity are Monazite and zircon Sands. These heavy mineral Sands were derived from the nearby source areas such as Eastern Ghats Group of rocks.

  • Geochemical studies of Monazite Sands of Chhatrapur beach placer deposit of Orissa, India by PIXE and EDXRF method
    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Debashish Sengupta, V. Vijayan, S. K. Saha
    Abstract:

    Abstract Geochemical characteristics of Monazite Sands of Chhatrapur beach placer deposit were studied by proton induced X-ray emission and energy dispersive X-ray fluorescence methods. The average concentrations of ThO 2 and UO 2 are found to be 10.18 and 0.26 wt.%, respectively. The average rare-earth elements (REE) content is 56.75 wt.% and they are rich in La, Ce and Nd. The most characteristic feature common to all Monazites is that the total REE content exceeds that of the actinides (U + Th). The chondrite-normalized REE distribution patterns of Monazite grains shows uniformly enriched light rare-earth element, which could be due to the preferential incorporation of lighter lanthanides. These Monazite Sands are derived from the granulite facies of metamorphic rocks such as khondalites and charnockites from Eastern Ghats Group of rocks.

S.k. Das - One of the best experts on this subject based on the ideXlab platform.

  • Radiogenic heavy minerals in Chhatrapur beach placer deposit of Orissa, southeastern coast of India
    Journal of Radioanalytical and Nuclear Chemistry, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Konstantin V. Van, Debashish Sengupta, S. K. Saha
    Abstract:

    The beach placer deposit at Chhatrapur coast of Orissa state, southeastern coast of India, has a significant concentration of radiogenic heavy minerals. The average activity concentrations of radioactive elements such as 232Th, 238U and 40K were measured by gamma ray spectrometry using a HPGe detector, and found to be 2650±50, 400±30 and 120±30 Bq/kg, respectively, for the bulk sand samples. The activity concentrations in Monazite and zircon Sands are found to be 305,000±2000 and 2000±150 Bq/kg for the 232Th and 21,500±300 and 3450±250 Bq/kg for the 238U. Electron probe microanalysis results of Monazite Sands show the average ThO2 and UO3 concentrations to be 10.42 wt.%, and 0.32 wt.%, respectively. The major contributors for the enhanced level of radioactivity are Monazite and zircon Sands. These heavy mineral Sands were derived from the nearby source areas such as Eastern Ghats Group of rocks.

  • Geochemical studies of Monazite Sands of Chhatrapur beach placer deposit of Orissa, India by PIXE and EDXRF method
    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Debashish Sengupta, V. Vijayan, S. K. Saha
    Abstract:

    Abstract Geochemical characteristics of Monazite Sands of Chhatrapur beach placer deposit were studied by proton induced X-ray emission and energy dispersive X-ray fluorescence methods. The average concentrations of ThO 2 and UO 2 are found to be 10.18 and 0.26 wt.%, respectively. The average rare-earth elements (REE) content is 56.75 wt.% and they are rich in La, Ce and Nd. The most characteristic feature common to all Monazites is that the total REE content exceeds that of the actinides (U + Th). The chondrite-normalized REE distribution patterns of Monazite grains shows uniformly enriched light rare-earth element, which could be due to the preferential incorporation of lighter lanthanides. These Monazite Sands are derived from the granulite facies of metamorphic rocks such as khondalites and charnockites from Eastern Ghats Group of rocks.

Debashish Sengupta - One of the best experts on this subject based on the ideXlab platform.

  • Radiogenic heavy minerals in Chhatrapur beach placer deposit of Orissa, southeastern coast of India
    Journal of Radioanalytical and Nuclear Chemistry, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Konstantin V. Van, Debashish Sengupta, S. K. Saha
    Abstract:

    The beach placer deposit at Chhatrapur coast of Orissa state, southeastern coast of India, has a significant concentration of radiogenic heavy minerals. The average activity concentrations of radioactive elements such as 232Th, 238U and 40K were measured by gamma ray spectrometry using a HPGe detector, and found to be 2650±50, 400±30 and 120±30 Bq/kg, respectively, for the bulk sand samples. The activity concentrations in Monazite and zircon Sands are found to be 305,000±2000 and 2000±150 Bq/kg for the 232Th and 21,500±300 and 3450±250 Bq/kg for the 238U. Electron probe microanalysis results of Monazite Sands show the average ThO2 and UO3 concentrations to be 10.42 wt.%, and 0.32 wt.%, respectively. The major contributors for the enhanced level of radioactivity are Monazite and zircon Sands. These heavy mineral Sands were derived from the nearby source areas such as Eastern Ghats Group of rocks.

  • Geochemical studies of Monazite Sands of Chhatrapur beach placer deposit of Orissa, India by PIXE and EDXRF method
    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2003
    Co-Authors: A.k. Mohanty, S.k. Das, Debashish Sengupta, V. Vijayan, S. K. Saha
    Abstract:

    Abstract Geochemical characteristics of Monazite Sands of Chhatrapur beach placer deposit were studied by proton induced X-ray emission and energy dispersive X-ray fluorescence methods. The average concentrations of ThO 2 and UO 2 are found to be 10.18 and 0.26 wt.%, respectively. The average rare-earth elements (REE) content is 56.75 wt.% and they are rich in La, Ce and Nd. The most characteristic feature common to all Monazites is that the total REE content exceeds that of the actinides (U + Th). The chondrite-normalized REE distribution patterns of Monazite grains shows uniformly enriched light rare-earth element, which could be due to the preferential incorporation of lighter lanthanides. These Monazite Sands are derived from the granulite facies of metamorphic rocks such as khondalites and charnockites from Eastern Ghats Group of rocks.