Radioenvironmental survey of the Megalopolis lignite field basin

Palaeoenvironment of Seam I in the Marathousa Lignite Mine, Megalopolis Basin (Southern Greece)

“…Another distinct feature of the Megalopolis lignite is the release of radiochemical constituents, which are emitted to the atmosphere during combustion as part of the fine fly-ash particles, while an important amount of these constituents remains in the bottom ash (Coles et al, 1978;Roeck et al, 1987;Simopoulos and Angelopoulos, 1987;Manolopoulou and Papastefanou, 1992;Rouni et al, 2001;Papaefthymiou et al, 2005Papaefthymiou et al, , 2007. Emission of radiochemical constituents from coal-fired power plants constitutes a severe environmental concern (Smith et al, 1979;Clarke and Sloss, 1992;Harrison and Jones, 1995).…”

Comparative assessment of natural radioactivity in fallout samples from Patras and Megalopolis, Greece

“…However, statistical analysis does not show a seasonal effect on any of the measured parameters in the four sites of Megalopolis. It has been shown by Rouni et al (2001) that the concentrations of 226 Ra (decay product of 238 U series) in surface soil samples around the area of power plant A in Megalopolis present higher values within a distance of 0-5 km from the power plant. The city of Megalopolis is located in this area of maximum deposition.…”

“…The corresponding specific activity values for uranium are 460 and 967 Bq kg ÿ1 and for thorium 35 and 55 Bq kg ÿ1 , respectively. The A s value was taken from the Rouni et al (2001) paper, considering that an equilibrium exists between 238 U and 226 Ra. Based on the above values, it is estimated that about 30% of the 238 U-and 20% of the 232 Th-activity in fallout samples is attributed to the dispersion of fly ash from the power plant.…”

“…According to these results, the specific activity values of 238 U and 232 Th in surface soil were found to be 320 and 28 Bq kg ÿ1 , respectively. These values are in the range of (26-337) Bq kg ÿ1 226 Ra and (24-41) Bq kg ÿ1 232 Th for surface soil within a distance of 0-5 km from the power plant A given by Rouni et al (2001). It is assumed that the total fallout in Patras consists only of resuspended surface soil (A f zA s ).…”

Μοντέλα Διακίνησης Και Εναπόθεσης Στερεών Σωματιδίων Ιπτάμενης Τέφρας Στο Περιβάλλον Και Συνακόλουθες Ραδιολογικές Επιπτώσεις Στην Λεκάνη Της Μεγαλόπολης

“…Επίσης έχει πραγµατοποιήσει µετρήσεις για τον προσδιορισµό της συγκέντρωσης του 226 Ra σε δείγµατα επιφανειακού χώµατος της περιοχής, έχει µετρήσει την συγκέντρωση του 222 Rn στο γηίνο αέριο σε διάφορες τοποθεσίες, ενώ έχει διεξάγει µετρήσεις του ϱυθ-µού εκροής 222 Rn από το έδαφος σε διάφορες τοποθεσίες [157]. ΄Εχει επίσης διεξάγει µετρήσεις για τον προσδιορισµό του ϱυθµού εκροής 222 Rn σε περιοχές, όπου γίνεται απόθεση ιπτάµενης τέφρας.…”