建築空間における空中浮遊微生物粒子の評価方法に関する研究(第2報) : アンダーセンサンプラーの捕集特性

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Collection characteristics of 6 stage type Andersen samplers for biological particle sampling were theoretically analyzed to give the relation of size distribution of original airborne particles and the collected biological particles. With the postulation of similarity of collection characteristics with the integral curves of log-normal distribution, using the Ranz and Wong's impaction parameter, the transfer rate of particles of certain size range to adjancent or other stages were calculated, applying with the "the white noise" type uniform size distribution. As for the geometric mean sizes, the particles of size range of 3-6 μm in diameter which cover major part of airborne fungal particles gave very similar values for both airborne and collected particles. As for standartd geometric deviation, for the above size ranges, very uniform relations were obtained for up to σ_g=0.7 which are very popular values for biological particles. The inclination of regression curves were approximately 1.06 and meant the necessity of correction factor of around 6 %. For distribution with higher σ_g, the relations are rather variable that means the six stage type Andersen samplers are not suitable for the evaluation of particles with geometric standard deviation larger than 0.8 which are rather sharp distribution rearely encountered with biologiclal particles of natural origin.
1987-05-30