In situ gamma-ray measurements of 40K, 232Th and 238U in high-grade metamorphic rocks from the Sowie Mountains (Sudetes, SW Poland)

Malczewski, Dariusz; Żaba, Jerzy

doi:10.7306/gq.1483

Artykuł - szczegóły

Tytuł artykułu

In situ gamma-ray measurements of 40K, 232Th and 238U in high-grade metamorphic rocks from the Sowie Mountains (Sudetes, SW Poland)

Autorzy

Malczewski Dariusz , Żaba Jerzy

Treść / Zawartość

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Malczewski_D_In situ_GQ_Vol.63_No.3_2019.pdf

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DOI

10.7306/gq.1483

Warianty tytułu

Języki publikacji

Abstrakty

This paper reports on the abundance of primordial radionuclides (⁴⁰K,²³²K and ²³⁸U) in characteristic lithologies from the Sowie Mountains (SW Poland). In situ gamma-ray measurements were conducted at 12 localities hosting exposed augen gneiss, flaser gneiss, granulite, homophanized gneiss, hornblendite, layered gneiss, layered migmatite, migmatic gneiss, mylonitic gneiss and mylonitic granulite. The activity concentration of ⁴⁰K varied from 180 Bq kg^-1 (mylonitic granulite) to 845 Bq kg^-1 (layered gneiss). The activity concentrations associated with ²²⁸Ac (²³²Th) varied from 10 Bq kg^-1 (mylonitic granulite) to 53 Bq kg^-1 (homophanized gneiss), while activity associated with ²²⁶Ra (²³⁸ U) varied from 9 Bq kg^-1 (mylonitic granulite) to 43 Bq kg^-1 (layered gneiss). An augen gneiss adjacent to the Intra-Sudetic Fault showed the highest combined Th + U activity (89 Bq kg^-1). The average Th/U ratio (3.6) calculated for gneiss outcrops of the Sowie Mountains falls within the range reported for biotite gneiss (3.5-4). Subsurface outcrops from the Walim-Rzeczka underground complex did not give noticeably higher ²³⁸U activities. The results obtained forthe Sowie lithologies are compared with those obtained by similar methods for similar rocks as reported in literature sources.

Słowa kluczowe

gneisses Sowie Mountains Sudetes natural radioactivity in situ measurements

Wydawca

Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy

Czasopismo

Geological Quarterly

Rocznik

2019

Tom

Vol. 63, No. 3

Strony

493--504

Opis fizyczny

Bibliogr. 52 poz., fot., rys., tab., wykr.

Twórcy

autor

Malczewski Dariusz

dariusz.malczewski@us.edu.pl

University of Silesia, Faculty of Earth Sciences, Będzińska 60, 41-200 Sosnowiec, Poland

autor

Żaba Jerzy

University of Silesia, Faculty of Earth Sciences, Będzińska 60, 41-200 Sosnowiec, Poland

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).

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Bibliografia

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