Dependency on face velocity of performance of aerosol sampling filter.

概要

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Penetration curves for NaCl aerosols of Toyo HE-40T filter which is widely used for radioactive aerosol sampling were studied as a function of filter face velocity.NaCl particles used as challenge aerosols were generated by an evaporation-condensation type generator, and were classified by an electrostatic classifier. The sizes of the mono-disperse aerosol were ranged from 0.032 to 0.13μm in diameter. Particle concentrations in upper and down flow of the test filter were measured by a condensation nucleus counter.It was observed that penetration was strongly dependent on the face velocity. A particle size at maximum penetration, which is called the most penetrating particle size, became smaller with increasing the face velocity from 0.13μm at 1.06cm/s to 0.045μm at 105cm/s. The maximum penetration at a face velocity of 58.9cm/s was found to be 0.35, and it was the highest in this study. These results suggest that the aerosol concentration obtained by using this filter should be estimated 0.65 times of the real value at the worst condition.
日本保健物理学会の論文