抄録
Results obtained from this study showed that significant bactericidal effect were obtained with ultra violet germicidal irradiation. However, it was not effective in some instances during the disinfection of the air, especially when the bacteria were believed to be attached to the dust particles in the air.Bacteria adhering to the dust particles are protected from direct irradiation. Although UV irradiation may reduce bacterial concentration in the air or may completely destroy the bacteria, air current and appropriate irradiation time should be taken into consideration.
From these standpoints, it is essential to eliminate the dust from the air as much as possible when disinfecting the air wirh UV germicidal lamp to enhance the effectiveness.
If conditions permit, it is necessary to close all windows of the room to be disinfected to prevent outside air from circulating in order to obtain effetive results. However, it may be possible in this instance to have an exchange of disinfected air by attaching an UV germicidal lamp to the ventilationduct.
