Thoriated electrodes are used in TIG welding.
TIG welders, along with persons who grind thoriated electrodes and persons located near relevant welding and grinding sites, might be at risk of thorium intake.
The isotopes of radiological relevance are 232Th, 230Th, and 228Th.
The studies described in the literature do not provide a consistent picture of the actual hazards, and changes in European and German radiological protection laws have now made it necessary to determine the risks.
To accomplish this, a field test was conducted under real working conditions in 26 different welding shops.
The airborne activity generated through welding, and through grinding of electrodes, was measured using personal air samplers.
Stationary samplers were also used.
The filters'samples were evaluated by means of direct alpha spectrometry with proportional counting and by means of gamma spectrometry following neutron activation.
The results clearly showed that considerable intake can occur during both alternating-current welding and electrode grinding, if no suction systems are used.
The range of 232Th intakes to welders were estimated from 0.1 Bq y-1 to 144 Bq y-1 during welding and from 0.02 Bq y-1 to 30.2 Bq y-1 during grinding. (...)
Mots-clés Pascal : Thorium, Soudage, Matériel soudage, Electrode, Maladie professionnelle, Dose rayonnement, Irradiation ionisante, Dosimétrie, Facteur risque, Evaluation, Réglementation, Europe
Mots-clés Pascal anglais : Thorium, Welding, Welding equipment, Electrodes, Occupational disease, Radiation dose, Ionizing irradiation, Dosimetry, Risk factor, Evaluation, Regulation, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0486216
Code Inist : 002B30B03. Création : 22/03/2000.