. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . sizes. These methods are all suffering from con- siderable errors. A great need for new possibilities of examining very fine particles has arisen. In modern dust combat- ing rather effective methods have been worked out for eliminating particles of light microscopical size, but these methods are less effective with regard to submicroscopical particles. Thus recirculation of air in dustladen workrooms may cause a concentration in the air of submicroscopical particles which pass 100% 80 60 P:61 TOXICITY 0,2 i
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . sizes. These methods are all suffering from con- siderable errors. A great need for new possibilities of examining very fine particles has arisen. In modern dust combat- ing rather effective methods have been worked out for eliminating particles of light microscopical size, but these methods are less effective with regard to submicroscopical particles. Thus recirculation of air in dustladen workrooms may cause a concentration in the air of submicroscopical particles which pass 100% 80 60 P:61 TOXICITY 0,2 i EXCRETION 54% 40 A = ^ 20 0 100% 80 â 60 ⢠40 â 20 0 100% 80 60 40 20 0 OZ Q6 1,0 jU P:5 5 TOXICITY 0,5^0,02 EXCRETION 23%
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