Work has been carried out in two laboratories to consider the requirement of extending the definition of inhalability into low air movement environments, typical of many modern workplaces and indoor environments.
The work has focused on two aspects, the development of a method for measurement of the aspiration efficiency of breathing manikin (which is the basis of the current convention) in these conditions, and the subsequent measurement of that efficiency.
A method has been devised for testing manikin aspiration efficiency in low air movement environments conditions using a chamber of dimensions approximately 1 m x 1 m x 3 m with pseudo-isokinetic reference probes circling about a vertical axis.
This method has been shown to give consistent results between the laboratories, with significantly lower uncertainty than applies in wind tunnels.
The manikin aspiration efficiency, tested at three breathing rates and over a range of particle acrodynamic diameters, was found to rise with breathing rate and be consistently higher than the existing convention.
The results obtained indicate that human inhalability in low air movement environments may be significantly greater than that in moving air conditions with a maximum bias of 48% being measured.
A revised form of the inhalable convention for low air movement environments is suggested.
Mots-clés Pascal : Inhalation, Aérosol, Milieu professionnel, Méthode mesure, Evaluation performance, Mannequin, Aspiration, Efficacité, Mouvement air, Faible, Rythme respiratoire, Voie respiratoire, Etude expérimentale, Hygiène travail, Médecine travail, Appareil respiratoire
Mots-clés Pascal anglais : Inhalation, Aerosols, Occupational environment, Measurement method, Performance evaluation, Dummy, Aspiration, Efficiency, Air motion, Low, Breathing rate, Respiratory tract, Experimental study, Occupational hygiene, Occupational medicine, Respiratory system
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0232189
Code Inist : 002B03L03. Création : 16/11/1999.