The increased risk of lung cancer arising from chronic exposure to radon progeny in Czech uranium mines was analyzed on the basis of specific energy distributions for basal and secretory cell nuclei.
The distributions were calculated from published results of lung microdosimetry.
Whereas classical concepts consider that cell nuclei are hit one or more times by alpha particle tracks, the microdosimetry is able to distinguish glancing (non-lethal, possibly carcinogenic) hits from alpha particle traversals near to nucleus center (which probably inactivate the cell).
The simple microdosimetric model differentiates both cases by the quantity termed boundary specific energy.
The importance of some confounding factors is examined.
Particularly the continuous replacement of bronchial epithelium cells by the new ones is worth considering.
Still, the lung cancer frequency seems to be related to the number of sensitive cells with glancing hits.
This might be a relevant argument to the toxicity of radon progeny.
The central idea of the model, the boundary specific energy, was tested on the basis of radiobiological experiments with isolated cell lines.
Mots-clés Pascal : Radiocontamination, Dosimétrie, Facteur risque, Bronche pathologie, Poumon pathologie, Tumeur maligne, Appareil respiratoire pathologie, Homme, Radon, Uranium, Etude expérimentale, In vitro, Prospection minière, Modèle, Bronchopulmonaire
Mots-clés Pascal anglais : Radioactive contamination, Dosimetry, Risk factor, Bronchus disease, Lung disease, Malignant tumor, Respiratory disease, Human, Radon, Uranium, Experimental study, In vitro, Mineral exploration, Models, Bronchopulmonary
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0260268
Code Inist : 002A08F03. Création : 199608.