Gama ray spectrometry and radon emissions in soils from the Piquiri Syenite Massif region (Encruzilhada do Sul e Cachoeira do Sul, RS),Espectrometria de raios gama e emissão de radônio em solos da região do Maciço Sienítico Piquiri (Cachoeira do Sul e Encruzilhada do Sul, RS)

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Erscheinungsjahr:
2016
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Text
Beschreibung:
  • This study was focused in performing a gamma radiation survey and measurements of radon concentration in soils from the Piquiri Syenite Massif, an intrusion located at central area of the Rio Grande do Sul State. This intrusion has alkaline affiliation with high concentrations of uranium in accessory minerals as zircon, sphene, apatite, and others. The gamma radiation measurements were made considering a grid with squares about 2 km side each, using the gamma spectrometer RS-125, obtaining counts per second (cps), dose rate (DR) and concentrations of K, eU and eTh. Moreover, measurements of "2"2"0Rn and "2"2"2Rn in soil were made using the AlphaGUARD equipment. The counts per second values obtained in this study range from 130 to 1045, the dose rate from 28.9 nSv/h to 424.6 nSv/h, the K concentration from 0.5 % to 8.3 %, the eU concentration from 0.8 ppm to 25.8 ppm, and the eTh concentration from 3.0 ppm to 99.2 ppm. The distribution of K defines with relatively precision the lithological contacts of the Piquiri Syenite Massif and between the two main facies of the intrusion (Main and Marginal Facies). The Main Facies of the syenite contains the highest concentrations of eTh, while the highest concentrations of eU were measured in the north area of this facies. The "2"2"0Rn and "2"2"2Rn concentrations range from 10 kBq/m"3 to 550 kBq/m"3 and from 5 kBq/m"3 to 400 kBq/m"3, respectively, in the Main and Marginal Facies. The high values of radon measured in Main Facies of the Piquiri Syenite Intrusion may indicate high potential risk to the health of inhabitants in the area.
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  • info:eu-repo/semantics/restrictedAccess
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Forschungsinformationssystem der UHH

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oai:www.edit.fis.uni-hamburg.de:publications/ba633eda-bdeb-473f-93c6-7db9da381ce8