Investigation of 'ANTPOT.238U'-'ANTPOT.230Th'-'ANTPOT.226Ra'and'ANTPOT.232Th'-'ANTPOT.228Ra'-'ANTPOT.228Th' radioactive disequilibria in volcanic rocks from Trindade and Martin Vaz Islands (Brazil; Southern Atlantic Ocean) - Santos, Rosana N; Marques, Leila Soares (Journal of Volcanology and Geothermal Research, 2007)