Magnetopneumography as a tool for the study of dust retention in the lungs.
Freedman-AP; Robinson-SE; Green-FH
Ann Occup Hyg, Inhaled Particles V, 1982 Sep; 26(1-4):319-335
The use of magnetopneumography for studying retention of ferromagnetic dust was evaluated among workers from several occupations. Uniform field magnetopneumography, consisting of a pair of 35 centimeter (cm) radium coils was used to measure arc welders (SIC-7692), machinists, and asbestos insulators (SIC-3092). Localized field magnetopneumography was used to study coal workers and comparison subjects. While the uniform field magnetopneumography method magnetized the whole chest, the localized field method magnetized only one region of the thorax at a time. A water cooled coil of 7.6cm radius was used in the localized field method. Average thoracic remainder fields in the welders ranged from 63 to 22,200 pico Tesla (pT) while the machinists averaged 17.2pT. The asbestos insulators had an average of 4.7pT, while comparisons averaged 4.5pT. The mean remainder field of the coal miners was 102pT, while the comparisons studied with the localized method had an average field of 122pT. Ferromagnetic dust content in welders correlated with years of welding but not with smoking history. All subjects with elevated concentrations of ferromagnetic dust manifested a pattern of hilar concentration. The authors conclude that, while there are some limitations to the use of magnetopneumography measurements of occupationally acquired ferromagnetic dust, the method had a major role in the prophylactic serial monitoring of dust accumulation in occupational groups which are at risk of dust related disease.
NIOSH-Author; Hazards; Fibrogenesis; Pulmonary-congestion; Occupational-hazards; Air-sampling; Occupational-exposure; Lung; Respiration; Fibrosis; Breathing; Inhalants
ALLAN P. Freedman, ALOSH, National Institute of Occupational Safety and Health, Morgantown, West Virginia
Annals of Occupational Hygiene, Inhaled Particles V