Abstract
The present paper deals with the results of the experiments on some problems for practical use of the ultraviolet sterilization.
The irradiation by germicidal lamp was more efficient at the lower temperature, the tube wall of the lamp being kept at the most suitable temperature for germicidal action by cooling.
The ultraviolet sensitivity of the microorganisms increased at the higher temperature which was optimal for their growth. However, as the degree of decrease in radiation efficiency due to increasing temperature was greater than the increase of sensitivity of microorganisms, it is likely that the sterilization is efficiently performed at the lower temperature. The visible and near-ultraviolet light included in the artificial sun lamp, accelerated the lethal action of germicidal lamp, acting synergic when irradiated with germicidal and artificial sun lamps together.
As a packing matter for the sterilization purpose, common cellophane was more efficient than dampproofed one, because the ultraviolet absorption of the former was lower than the latter.
