The Accumulation, retention and distribution of 95mTc in crab (Cancer pagurus L.) and lobster (Homarus gammarus L.). a comparative study

Seasonal variations in activity concentrations of 99Tc and 137Cs in the edible meat fraction of crabs and lobsters from the central Irish Sea

“…Activity concentrations in the edible fraction ranged from 0.23 to 2.46 Bq kg À1 (fw) in crabs and 124 to 216 Bq kg À1 (fw) in lobsters. The much lower activity concentrations in crabs are consistent with the greater uptake of 99 Tc into lobsters that has been reported elsewhere (Pentreath, 1981;IAEA, 1985 ;Busby et al, 1997; Smith et al, 1998). The reported activity concentrations for crabs are an order of magnitude lower in the 12-month period of sampling compared with the results from the pilot study (12-21 Bq kg À1 , fw, September, 1999).…”

“…1), most notably seaweed (such as the brown-wracks) and crustaceans (particularly lobster). These observations confirmed earlier studies that lobsters have a high accumulation capacity for 99 Tc compared with other crustaceans (Pentreath, 1981;IAEA, 1985;Busby et al, 1997;Smith et al, 1998).…”

“…99 Tc accumulation has been variously reported to be evenly distributed between white (muscle) and brown (e.g. hepatopancreas) meat (Busby et al, 1997), to have lower concentrations in brown meat (Pentreath, 1979), and higher in the hepatopancreas (brown meat) (Conversi, 1985;Smith et al, 1998). As this covers all possibilities, it is difficult to discern how biometric factors of size and weight will influence the observed decline in 99 Tc concentrations.…”

Diffusion of99Tc in granite: A small scale laboratory simulation experiment

“…Technetium is considered to be an important radionuclide with regard to radioecology [2,3]. Under aerobic conditions, pertechnetate (TcO 4 − ) is regarded to be rather stable, easily movable with water and accumulated in animals and plants, such as crab, lobster, spinach, algae and so on [4][5][6][7][8]. Some researches indicated that 99 TcO 4 − moves even faster than HTO due to ion exclusion effects [9,10].…”

Migration of99Tc in unsaturated Chinese loess under artificial rainfall condition: anin situtest

“…Under aerobic conditions, pertechnetate (TcO 4 − ) was regarded to be rather stable, easily movable with water and easily accumulated in animals and plants, such as crab, lobster, spinach, algae and so on [2][3][4][5][6]. Some migration studies indicated that there was no significant difference between the migration of 99 Tc and that of 3 H or Br − in aquifers [7][8][9], while few data concerning the migration of this nuclide in aerated zones has been reported.…”