(210)Po and (210)Pb in the tissues of the deep-sea hydrothermal vent mussel Bathymodiolus azoricus from the Menez Gwen field (Mid-Atlantic Ridge).
The hydrothermal deep-sea vent fauna is naturally exposed to a highly specific environment enriched in potentially toxic species such as sulfides, metals and natural radionuclides due to the convective seawater circulation inside the oceanic crust and its interaction with basaltic or ultramafic host rocks. However, data on radionuclides in biota from such environment are very limited. An investigation was carried out on tissue partitioning of (210)Po and (210)Pb, two natural radionuclides within the (238)U decay chain, in Bathymodiolus azoricus specimens from the Mid-Atlantic Ridge (Menez Gwen field). These two elements showed different distributions with high (210)Pb levels in gills and high (210)Po levels in both gills and especially in the remaining parts of the body tissue (including the digestive gland). Various factors that may explain such partitioning are discussed. However, (210)Po levels encountered in B. azoricus were not exceptionally high, leading to weighted internal dose rate in the range 3 to 4 μGy h⁻¹. These levels are slightly higher than levels characterizing coastal mussels (~1 μGy h⁻¹).
Institut de Radioprotection et de Sûreté Nucléaire, IRSN-DEI Centre IFREMER, La Seyne Sur Mer Cedex, France. Sabine.Charmasson@irsn.fr
Sabine
S
Charmasson
Antoine
A
Le Faouder
Jeanne
J
Loyen
Richard P
RP
Cosson
Pierre-Marie
PM
Sarradin
D000818:Animals; D001267:Atlantic Ocean; D004777:Environment; D005880:Gills / Q000378:metabolism; D045482:Hot Springs; D007856:Lead Radioisotopes / Q000378:metabolism*; D049879:Mytilidae / Q000378:metabolism*; D011059:Polonium / Q000378:metabolism*; D011829:Radiation Dosage; D011834:Radiation Monitoring; D012623:Seawater / Q000737:chemistry; D014875:Water Pollutants, Radioactive / Q000378:metabolism*
D007856:Lead Radioisotopes; D014875:Water Pollutants, Radioactive; D011059:Polonium