Characterisation and dissolution of depleted uranium aerosols produced during impacts of kinetic energy penetrators against a tank.
Aerosols produced during impacts of depleted uranium (DU) penetrators against the glacis (sloping armour) and the turret of a tank were sampled. The concentration and size distribution were determined. Activity median aerodynamic diameters were 1 microm (geometric standard deviation, sigma(g) = 3.7) and 2 microm (sigma(g) = 2.5), respectively, for glacis and turret. The mean air concentration was 120 Bq m(-3), i.e. 8.5 mg m(-3) of DU. Filters analysed by scanning electron microscopy (SEM) and X ray diffraction showed two types of particles (fine particles and large molten particles) composed mainly of a mixture of uranium and aluminium. The uranium oxides were mostly U3O8, UO2.25 and probably UO3.01 and a mixed compound of U and Al. The kinetics of dissolution in three media (HCO3-, HCl and Gamble's solution) were determined using in-vitro tests. The slow dissolution rates were respectively slow, and intermediate between slow and moderate, and the rapid dissolution fractions were mostly intermediate between moderate and fast. According to the in-vitro results for Gamble's solution, and based on a hypothetical single acute inhalation of 90 Bq, effective doses integrated up to 1 y after incorporation were 0.54 and 0.56 mSv, respectively, for aerosols from glacis and turret. In comparison, the ICRP limits are 20 mSv y(-1) for workers and 1 mSv y(-1) for members of the public. A kidney concentration of approximately 0.1 microg U g(-1) was predicted and should not, in this case, lead to kidney damage.
Chazel
V
V
Institut de Radioprotection et de Sûreté Nucléaire, Département de Protection de la Santé de l'Homme et de Dosimétrie, Service de Dosimétrie, LEAR, BP 166, F 26702 Pierrelatte Cedex, France. valerie.chazel@irsn.fr
Gerasimo
P
P
Dabouis
V
V
Laroche
P
P
Paquet
F
F
D000336:Aerosols; D000396:Air Pollutants, Radioactive / Q000032:analysis* / Q000493:pharmacokinetics; D001822:Body Burden; D003198:Computer Simulation; D004391:Dust / Q000032:analysis; D005389:Firearms; D005602:France; D006801:Humans; D019570:Inhalation Exposure / Q000032:analysis*; D008168:Lung / Q000378:metabolism; D008657:Metabolic Clearance Rate; D008889:Military Personnel; D008954:Models, Biological; D009928:Organ Specificity; D010087:Oxides / Q000032:analysis / Q000145:classification / Q000493:pharmacokinetics; D010316:Particle Size; D011829:Radiation Dosage; D011850:Radioactive Waste / Q000032:analysis*; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D012212:Rheology / Q000379:methods; D014501:Uranium / Q000032:analysis* / Q000145:classification / Q000493:pharmacokinetics
D000336:Aerosols; D000396:Air Pollutants, Radioactive; D004391:Dust; D010087:Oxides; D011850:Radioactive Waste; D014501:Uranium