PŘIROZENÁ RADIOAKTIVITA KULMSKÝCH SEDIMENTŮ NA VÝCHODNÍM OKRAJI ČESKÉHO MASIVU

Contents of potassium, uranium and thorium were measured using a laboratory gamma–ray spectrometer in more then two thousand samples of Upper Devonian to Lower Carboniferous siliciclastic flysch sediments outcropping on the easternmost margin of the Bohemian Massif (mainly in the Drahany Mts. and Nízký Jeseník Mts.). Studied rocks belong to eight formations: Protivanov Fm., Rozstání Fm., Myslejovice Fm., Mohelnice Fm., Andělská Hora Fm., Horní Benešov Fm., Moravice Fm. and Hradec–Kyjovice Fm. Conglomerates (incl. gravelites), various types of psammites (mainly graywackes), siltstones, silty shales and clay shales occur in all mentioned formations. Quartzites and phyllites dominated in the source zone of clastic sediments of Mohelnice Fm. and Andělská Hora Fm., therefore K, U and Th contents in siliciclastic sediments of the both formations are correspondingly low. Relatively high radioactivity of sediments belonging to remaining six formations suggests a significant contribution of acid or intermediate magmatic rocks in the source zone of clastic material.

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Přirozená radioaktivita krystalinika, paleozoických sedimentárních hornin a vybraných kenozoických sedimentů na mapovém listu 24-22 Olomouc

Geologické výzkumy na Moravě a ve Slezsku ◽

10.5817/gvms2017-1-2-65 ◽

2017 ◽

Vol 24 (1-2) ◽

Cited By ~ 1

Author(s):

Jiří Zimák

Keyword(s):

Natural Radioactivity ◽

Gamma Ray ◽

Sedimentary Rocks ◽

Crystalline Rocks ◽

Fluvial Sediments ◽

Gamma Ray Spectrometer ◽

Clay Shales ◽

Mass Activity ◽

Geological Units ◽

Cenozoic Sediments

The paper deals with natural radioactivity of crystalline rocks, Palaeozoic sedimentary rocks and selected Cenozoic sediments on the map sheet 24-22 Olomouc. Studied rocks belong to the following geological units: the Brunovistulicum (Proterozoic granitoids and dioritoids, often mylonitized), the Moravo-Silesian Palaeozoic (mainly carbonate rocks of the Macocha and Líšeň Fms. and flysch sediments of the Andělská Hora, Protivanov, Horní Benešov, Rozstání, Moravice and Myslejovice Fms.), the Carpathian Foredeep (Miocene marine sands and clays) and the Upper Morava Basin (Pliocene-Pleistocene lacustrine and fluvial sediments, and loesses). Contents of potassium, uranium and thorium were measured using a laboratory gamma–ray spectrometer in 612 rock samples. Data are tabled and discussed. From calculated values of mass activity of 226Ra equivalent (am) it is evident that natural radioactivity of the studied rocks is predominantly low. Slightly increased am values were found in silty shales, clay shales and siltstones of the Rozstání Fm. (189 Bq.kg-1 on average, 308 Bq.kg-1 in the sample with the highest natural radioactivity).

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Geochemie a radioaktivita paleozoických hornin na listech 15-31 Bruntál a 15-33 Moravský Beroun a jejich souvislost se složením variské hydrotermální mineralizace

Geologické výzkumy na Moravě a ve Slezsku ◽

10.5817/gvms2019-1-2-90 ◽

2019 ◽

Vol 26 (1-2) ◽

Author(s):

Jiří Zimák ◽

Marek Slobodník ◽

Přemysl Pořádek

Keyword(s):

Natural Radioactivity ◽

Gamma Ray ◽

Sedimentary Rocks ◽

Low Grade ◽

Rock Samples ◽

Quartz Veins ◽

Gamma Ray Spectrometer ◽

Clay Shales ◽

Mass Activity ◽

Flysch Rocks

This paper deals with the natural radioactivity of Palaeozoic rocks on the map sheets 15- 31 Bruntál and 15-33 Moravský Beroun in the NE part of the Bohemian Massif. Studied rocks belong to the Vrbno Group (greenschists and phyllites) and mainly to the MoravoSilesian Palaeozoic, particulary to the Andělská Hora, Horní Benešov and Moravice Fms. Potassium, uranium and thorium contents were measured in 1 596 rock samples using a laboratory gamma–ray spectrometer, values of mass activity of 226Ra equivalent (am) were calculated. The average am of analysed rock samples is 138 Bq.kg-1. This value is very close to the am value calculated for the average continental crust. Natural radioactivity of flysch sedimentary rocks of the Andělská Hora, Horní Benešov and Moravice Fms. (1 350 analysed samples, avg. am = 150 Bq.kg-1) grows from psefi tes (conglomerates) to psammites (dominating greywackes) up to the group of aleurites and pelites (siltstones, silty shales, clay shales). The highest uranium and thorium contents, along with other metals (Cs, Ga, Rb, Sn, Zr, La, Ce, Pb, Zn, As) were found in flysch rocks of the Horní Benešov Fm. in the area near Valšov: greywacke shows content up to 13 ppm U and 25 ppm Th (am = 364 Bq.kg-1) and siltstone up to 21 ppm U and 43 ppm Th (am = 624 Bq.kg-1). Low-grade metamorphic mobilization of elements is documented by hydrothermal minerals in syntectonic quartz veins which are e.g. fluorite, sulphides, REE-bearing phases, U-bearing phases.

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PŘIROZENÁ RADIOAKTIVITA PALEOZOICKÝCH SEDIMENTŮ A CHEMISMUS KARBONÁTOVÝCH HORNIN NA MAPOVÝCH LISTECH 25-11 HLUBOČKY A 25-12 HRANICE

Geologické výzkumy na Moravě a ve Slezsku ◽

10.5817/gvms2018-1-2-128 ◽

2018 ◽

Vol 25 (1-2) ◽

Author(s):

Jiří Zimák

Keyword(s):

Continental Crust ◽

Natural Radioactivity ◽

Carbonate Rocks ◽

Gamma Ray ◽

Sedimentary Rocks ◽

Rock Samples ◽

Gamma Ray Spectrometer ◽

Clay Shales ◽

Mass Activity ◽

Carbonate Formations

This paper deals with natural radioactivity of Palaeozoic sedimentary rocks in the map sheets 25-11 Hlubočky and 25-12 Hranice. All studied rocks belong to the Moravo-Silesian Palaeozoic, namely to three flysch formations (Horní Benešov, Moravice and Hradec-Kyjovice fms.) and two carbonate formations (Macocha and Líšeň fms.). Contents of potassium, uranium and thorium were measured using a laboratory gamma–ray spectrometer in 1 337 rock samples, values of mass activity of 226Ra equivalent (am) were calculated. The data are tabled and discussed. The average am of analysed flysch sediments is 160 Bq.kg-1. This value is very close to the value of am calculated for the average continental crust. Natural radioactivity of flysch sedimentary rocks grows from psefites (conglomerates) through psammites (graywackes dominate) to the group of aleurites and pelites (siltstones, silty shales, clay shales). Natural radioactivity of the studied carbonate rocks is very low. In dark biodetritic limestones of the Líšeň Fm. there were found slightly increased uranium contents (typically up to 6 ppm). Uranium in the rock is probably bound to graphitic matter.

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MOBILE COLLIMATED GAMMA-RAY SPECTROMETER

Telecommunications and Radio Engineering ◽

10.1615/telecomradeng.v74.i1.80 ◽

2015 ◽

Vol 74 (1) ◽

pp. 87-93

Author(s):

N.A. Kochnev

Keyword(s):

Gamma Ray ◽

Gamma Ray Spectrometer

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Design and construction of a gamma-ray spectrometer system for determining natural radioelement concentrations in geological samples at the U.S. Geological Survey in Reston, Virginia

Open-File Report ◽

10.3133/ofr0329 ◽

2003 ◽

Cited By ~ 7

Author(s):

Stephen L. Snyder ◽

Joseph S. Duval

Keyword(s):

Gamma Ray ◽

Geological Survey ◽

Geological Samples ◽

Gamma Ray Spectrometer ◽

Spectrometer System ◽

Natural Radioelement ◽

The U.S ◽

Design And Construction

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Elemental analysis of medicinal plants from different sites by instrumental neutron activation analysis

International Journal of Bioassays ◽

10.21746/ijbio.2016.03.0010 ◽

2016 ◽

Vol 5 (03) ◽

pp. 4892 ◽

Cited By ~ 2

Author(s):

Ratna Raju M.* ◽

Madhusudhana Rao P. V. ◽

Seshi Reddy T. ◽

Raju M. K. ◽

Brahmaji Rao J. S. ◽

...

Keyword(s):

Neutron Activation Analysis ◽

Instrumental Neutron Activation Analysis ◽

Activation Analysis ◽

Medicinal Plants ◽

Neutron Activation ◽

Gamma Ray ◽

Elemental Content ◽

Soil Composition ◽

Gamma Ray Spectrometer ◽

Instrumental Neutron Activation

A study was undertaken to evaluate the inorganic elements for humans in two Indian medicinal plants leaves, namely Sphaeranthus indicus, and Cassia fistula by Instrumental Neutron Activation Analysis (INAA). INAA experiment was performed by using 20 kW KAMINI Reactor at Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam. The emitted gamma rays were measured using gamma ray spectrometer. The concentrations of Al, Br, Ca, Fe, K, La, Mg, Mn, Na, Sc, V and Zn were determined in the selected medicinal plants. The medicinal leaves are using in treatment of various important ailments. The elemental content in selected medicinal leaves is various proportions depending on the soil composition, location of plant specimen and the climate in which the plant grows.

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