Laboratory measurements of natural radioactivity in selected igneous rocks of the Opava Mountains region

• Autorzy: Dżaluk A. , Malczewski D. , Żaba J. , Dziurowicz M.

Identyfikatory

DOI

10.7494/geol.2015.41.1.73

• Konferencja: XVIth International Conference of Young Geologists Her'lany 2015
• Języki publikacji: EN

Abstrakty

EN

The paper presents the results of the laboratory gamma-ray measurements of six igneous rocks from the Opava Mountains. The Opava Mountains are located in the Eastern Sudetes and represent their furthest eastern range. They run almost latitudinally along the Polish border with the Czech Republic. The Opava Mountains are mostly situated in the Czech Republic. Only a small fragment between Głuchołazy in the west and Prudnik in the east is situated in Poland (Janeczek et al. 1991). The study area is built of rocks of different ages and lithologies. The Opava Mountains belong to the western part of the Upper Silesia Block, which together with the Brno Block form a structure that is called the Brunovistulicum. The mountains consist of five structural stages: the Žulova Massif, the Desna Series, the Vrbno Series, the Andělská-Hora Formation and the Horn-Benešov Formation, which run longitudinally (Żaba et al. 2005). The activities of naturally occurring radionuclides were measured using a portable GX3020 gamma-ray workstation. The system is based on a high-purity germanium (HPGe) detector with a 32% relative efficiency and energy resolutions of 0.8 keV at 122 keV and 1.7 keV at 1330 keV. The activity concentrations of 40K varied from 519 Bq∙kg−1(paragneiss, Głuchołazy/Mikulice) to 1559 Bq∙kg−1(weathered granite, Sławniowice), while those of 228Ac (232Th series) from 7.2 Bq∙kg−1(weat hered granite, Sławniowice) to 70.6 Bq∙kg−1 (migmatitic gneiss, Nadziejów). The activities that were associated with 226Ra (238U series) ranged from 5.5 Bq∙kg−1(weathered granite, Sławniowice) to 52.2 Bq∙kg−1 (gneiss, Kamienna Góra). The measured activity concentrations were compared with the average activity concentration of 40K, 228Ac (232Th) and 226Ra (238U) for similar types of rocks reported in the world specialist literature. The average value of the activity concentrations of 40K for granites and gneisses equals 1000 Bq∙kg−1 (Van Schmus 1995, Eisenbud & Gesell 1997), which means that the measured value of granite in the Sławniowice quarry is significantly higher than the average one, whereas the activity concentration of paragneiss is almost two times lower than the average value of similar types of rocks. The activity concentrations of 228Ac (232Th) and 226Ra (238U) in measured rocks are comparable to the average values (70 Bq∙kg−1 and 40 Bq∙kg−1 respectively (Van Schmus 1995, Eisenbud & Gesell 1997). Only the activity concentrations of granite in the Sławniowice quarry are considerably lower than the average values for the typical ones because it is strongly weathered. The aim of this paper is to show the first experimental data concerning the activity concentrations of primordial radionuclides in the igneous rocks in the Opava Mountains.

Słowa kluczowe

EN

stage; mountain; lithology

• Wydawca: Wydawnictwa AGH
• Czasopismo: Geology, Geophysics and Environment
• Rocznik: 2015
• Tom: Vol. 41, no. 1
• Strony: 73--74
• Opis fizyczny: Bibliogr. 4 poz.

Twórcy

autor

Dżaluk A.

• University of Silesia, Faculty of Earth Sciences, Department of Applied Geology; ul. Będzińska 60, 41-200 Sosnowiec, Poland

autor

Malczewski D.

• University of Silesia, Faculty of Earth Sciences, Department of Applied Geology; ul. Będzińska 60, 41-200 Sosnowiec, Poland

autor

Żaba J.

• -mail: [e-mail], dariusz.ma [e-mail], [e-mail] 2 University of Silesia, Faculty of Earth Sciences, Department of Fundamental Geology; ul. Będzińska 60, 41-200 Sosnowiec, Poland

autor

Dziurowicz M.

• University of Silesia, Faculty of Earth Sciences, Department of Applied Geology; ul. Będzińska 60, 41-200 Sosnowiec, Poland

Bibliografia

• 1. Eisenbud M. & Gesell T., 1997. Natural Radioactivity. [in:] Environmental radioactivity from natural, industrial and military sources, Academic Press, San Diego, CA, 134–200.
• 2. Janeczek J., Kozłowski K. & Żaba J., 1991. Zbieramy minerały i skały. Przewodnik po Dolnym Śląsku pod red. naukową Jerzego Żaby. Wydawnictwa Geologiczne, Warszawa.
• 3. Van Schmus W.R., 1995. Natural radioactivity of the Crust and the Mantel. [in:] Ahrens T.J. (eds), Global Earth Physics, American Geophysical Union, Washington, 283–291.
• 4. Żaba J., Ciesielczuk J., Malik K. & Strzyżewska-Konieczna S., 2005. Budowa i ewolucja strukturalna utworów dewońsko-karbońskich Gór Opawskich (strefa śląsko-morawska). [in:] Jureczek J., Buła Z. & Żaba J. (eds), Geologia i zagadnienia ochrony środowiska w rejonie Górnośląskim, LXXVI Zjazd Naukowy Polskiego Towarzystwa Geologicznego, Rudy k/Rybnika, Państwowy Instytut Geologiczny, Polskie Towarzystwo Geologiczne, Warszawa, 116–127.