marlene moraes - Academia.edu (original) (raw)
Uploads
Papers by marlene moraes
Journal of Environmental Radioactivity, 2002
Fifty-two soil samples in the vicinity of a coal-fired power plant (CFPP) in Figueira (Brazil) we... more Fifty-two soil samples in the vicinity of a coal-fired power plant (CFPP) in Figueira (Brazil) were analyzed. The radionuclide concentration for the uranium and thorium series in soils ranged from Ͻ9 to 282 Bq kg Ϫ1 . The range of 40 K concentration in soils varied from Ͻ59 to 412 Bq kg Ϫ1 . The CFPP (10 MWe) has been operating for 35 years and caused a small increment in natural radionuclide concentration in the surroundings. This technologically enhanced natural radioactivity (TENR) was mainly due to the uranium series ( 234 Th, 226 Ra and 210 Pb) and was observable within the first kilometer from the power plant. The CFPP influence was only observed in the 0-25 cm soil horizon. The soil properties prevent the radionuclides of the 238 U-series from reaching deeper soil profiles. The same behavior was observed for 40 K as well. No influence was observed for 232 Th, which was found in low concentrations in the coal. : S 0 2 6 5 -9 3 1 X ( 5-8 286 M. Flues et al. / J. Environ. Radioactivity 63 (2002) 285-294 coal are 35 Bq kg -1 (range: 16-110) for 238 U, 35 Bq kg Ϫ1 (range: 17-60) for 226 Ra, 30 Bq kg Ϫ1 (range: 11-64) for 232 Th and 400 Bq kg Ϫ1 (range: 140-850) for 40 K.
Journal of Environmental Radioactivity, 2002
Fifty-two soil samples in the vicinity of a coal-fired power plant (CFPP) in Figueira (Brazil) we... more Fifty-two soil samples in the vicinity of a coal-fired power plant (CFPP) in Figueira (Brazil) were analyzed. The radionuclide concentration for the uranium and thorium series in soils ranged from Ͻ9 to 282 Bq kg Ϫ1 . The range of 40 K concentration in soils varied from Ͻ59 to 412 Bq kg Ϫ1 . The CFPP (10 MWe) has been operating for 35 years and caused a small increment in natural radionuclide concentration in the surroundings. This technologically enhanced natural radioactivity (TENR) was mainly due to the uranium series ( 234 Th, 226 Ra and 210 Pb) and was observable within the first kilometer from the power plant. The CFPP influence was only observed in the 0-25 cm soil horizon. The soil properties prevent the radionuclides of the 238 U-series from reaching deeper soil profiles. The same behavior was observed for 40 K as well. No influence was observed for 232 Th, which was found in low concentrations in the coal. : S 0 2 6 5 -9 3 1 X ( 5-8 286 M. Flues et al. / J. Environ. Radioactivity 63 (2002) 285-294 coal are 35 Bq kg -1 (range: 16-110) for 238 U, 35 Bq kg Ϫ1 (range: 17-60) for 226 Ra, 30 Bq kg Ϫ1 (range: 11-64) for 232 Th and 400 Bq kg Ϫ1 (range: 140-850) for 40 K.