首页|In situ gamma-ray measurements of K-40, Th-232 and U-238 in high-grade metamorphic rocks from the Sowie Mountains (Sudetes, SW Poland)
In situ gamma-ray measurements of K-40, Th-232 and U-238 in high-grade metamorphic rocks from the Sowie Mountains (Sudetes, SW Poland)
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NSTL
Polish Geological Inst
This paper reports on the abundance of primordial radionuclides (K-40, Th-232 and U-238) 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 K-40 varied from 180 Bq kg(-1) (mylonitic granulite) to 845 Bq kg(-1) (layered gneiss). The activity concentrations associated with Ac-228 (Th-232) varied from 10 Bq kg(-1) (mylonitic granulite) to 53 Bq kg(-1) ( homophanized gneiss), while activity associated with Ra-226 (U-238) 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 U-238 activities. The results obtained for the Sowie lithologies are compared with those obtained by similar methods for similar rocks as reported in literature sources.
NSTL
Polish Geological Inst
