Assessment Of Hazard Index And Radium Activity Of Two Granites In South Of Brazil Through Gamma-Ray Spectrometry Of Airborne And Ground Data By Francesco Antonelli

Francesco Antonelli*¹, Francisco José Fonseca Ferreira¹, Oderson Souza Filho2
1Geophys. Lab, Federal Univ. of Paraná,
2Center for Technol. Dev., Geol. Survey of Brazil
Curitiba, Paraná, Brazil


This work investigates the radium equivalent activity (Ra eq) and the external hazard index (H ex) of the Serra do Carambeí (CA) and Joaquim Murtinho (JM) granites, in the southern region of Brazil, by counting of the radioelement potassium, uranium and thorium through airborne and terrestrial gamma-ray spectrometry data. An  average of 1.78 for JM-airborne, 1.58 for CA-ground, and 1.07 for CA-airborne data sets affirm dangerous levels of radiation exposure, with the highest values of 5.23 in CA-airborne, 8.29 in CA-ground, 5.1 in JM-airborne, and 12 in JM-ground data sets. The levels of  reached 1,364 Bq/kg for CA-air borne, 2,449 Bq/kgfor CA-ground, 1,484 Bq/kg for JM-airborne, and 3,331Bq/kg for JM-ground data sets. The JM-ground data presented an average of radium equivalent exceeding the reference concentration of 370 Bq/kg. These results are above the recommended reference concentration by radiological and medical institutions.

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