“…Migmatic gneiss (sample 3) showed twice the uranium activity than those noted in Brazil [ 15 ] and in the Bohemian Massif [ 14 ]. The measured uranium activity in paragneisses (sample 5, 16 Bq kg −1 ) is lower than that reported for paragneisses from the Bohemian Massif (21–42 Bq kg −1 ) [ 14 , 29 ]. Fig.…”
Section: Resultscontrasting
confidence: 55%
“…These values are also significantly lower than those measured in Turkey [ 21 , 22 ], where, in the Kaymaz pluton, the average activity concentration of uranium amounted to more than 300 Bq kg −1 ). The activity of 238 U for granite from Kamienna Góra (sample 1) was reported to be similar to granites from Mexico [ 29 ] and Yemen [ 19 ]. The activities measured in the region of the Great Caucasus [ 17 ] and Saudi Arabia [ 23 ] were lower, but still significantly higher than that in weathered granite from the Sławniowice quarry (sample 4).…”
The natural radioactivities of five characteristic igneous rocks of the eastern foreland of the Opava Mountains (Eastern Sudetes, Poland), obtained in the laboratory and under in situ conditions, are presented. The activity concentrations of 232Th, 238U, and 40K were measured using an HPGe gamma-ray spectrometry system. The ranges of the activity concentrations of 232Th were 7–71 Bq kg−1 in the laboratory and 6–68 Bq kg−1 for the in situ measurements. For 238U, the ranges of the activity concentrations were 5–52 Bq kg−1 in the laboratory and 9–48 Bq kg−1 for the in situ measurements, and for 40K, the ranges were 520–1560 Bq kg−1 in the laboratory and 537–1700 Bq kg−1 for the in situ measurements. These determined activity concentrations were compared with the average activity concentrations of the radionuclides in similar types of rocks and with data from the Sudetes available in the literature. No significant differences were found between the in situ and laboratory measurements.
“…Migmatic gneiss (sample 3) showed twice the uranium activity than those noted in Brazil [ 15 ] and in the Bohemian Massif [ 14 ]. The measured uranium activity in paragneisses (sample 5, 16 Bq kg −1 ) is lower than that reported for paragneisses from the Bohemian Massif (21–42 Bq kg −1 ) [ 14 , 29 ]. Fig.…”
Section: Resultscontrasting
confidence: 55%
“…These values are also significantly lower than those measured in Turkey [ 21 , 22 ], where, in the Kaymaz pluton, the average activity concentration of uranium amounted to more than 300 Bq kg −1 ). The activity of 238 U for granite from Kamienna Góra (sample 1) was reported to be similar to granites from Mexico [ 29 ] and Yemen [ 19 ]. The activities measured in the region of the Great Caucasus [ 17 ] and Saudi Arabia [ 23 ] were lower, but still significantly higher than that in weathered granite from the Sławniowice quarry (sample 4).…”
The natural radioactivities of five characteristic igneous rocks of the eastern foreland of the Opava Mountains (Eastern Sudetes, Poland), obtained in the laboratory and under in situ conditions, are presented. The activity concentrations of 232Th, 238U, and 40K were measured using an HPGe gamma-ray spectrometry system. The ranges of the activity concentrations of 232Th were 7–71 Bq kg−1 in the laboratory and 6–68 Bq kg−1 for the in situ measurements. For 238U, the ranges of the activity concentrations were 5–52 Bq kg−1 in the laboratory and 9–48 Bq kg−1 for the in situ measurements, and for 40K, the ranges were 520–1560 Bq kg−1 in the laboratory and 537–1700 Bq kg−1 for the in situ measurements. These determined activity concentrations were compared with the average activity concentrations of the radionuclides in similar types of rocks and with data from the Sudetes available in the literature. No significant differences were found between the in situ and laboratory measurements.
“…As ex pected, the low est com bined ac tiv i ties were observed in mylonitic granulite (19 Bq kg -1 ), hornblendite (28 Bq kg -1 ) and granulite (37 Bq kg -1 ). Kresl and Vankova (1982) re ported a sim i lar com bined Th + U ac tiv ity value of 39 Bq kg -1 for granulite from the Bo he mian Mas sif (Th and U ac tiv ities of 27 and 12 Bq kg -1 , re spec tively).…”
As so ci ate ed i tor: Stanis³aw Wo³kowicz This pa per re ports on the abun dance of pri mor dial radionuclides (40 K, 232 Th and 238 U) in char ac ter is tic lithologies from the Sowie Moun tains (SW Po land). In situ gamma-ray mea sure ments were con ducted at 12 lo cal i ties host ing ex posed augen gneiss, flaser gneiss, granulite, homophanized gneiss, hornblendite, lay ered gneiss, lay ered migmatite, migmatic gneiss, mylonitic gneiss and mylonitic granulite. The ac tiv ity con cen tra tion of 40 K var ied from 180 Bq kg-1 (mylonitic granulite) to 845 Bq kg-1 (lay ered gneiss). The ac tiv ity con cen tra tions as so ci ated with 228 Ac (232 Th) var ied from 10 Bq kg-1 (mylonitic granulite) to 53 Bq kg-1 (homophanized gneiss), while ac tiv ity as so ci ated with 226 Ra (238 U) var ied from 9 Bq kg-1 (mylonitic granulite) to 43 Bq kg-1 (lay ered gneiss). An augen gneiss ad ja cent to the Intra-Sudetic Fault showed the high est com bined Th + U ac tivity (89 Bq kg-1). The av er age Th/U ra tio (3.6) cal cu lated for gneiss out crops of the Sowie Moun tains falls within the range reported for bi o tite gneiss (3.5-4). Subsurface out crops from the Walim-Rzeczka un der ground com plex did not give no tice ably higher 238 U ac tiv i ties. The re sults ob tained for the Sowie lithologies are com pared with those ob tained by sim i lar meth ods for sim i lar rocks as re ported in lit er a ture sources.
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