Abstract
The concentration of airborne particles is considered to be as one of the important factors to estimate the environment in the room. The purpose of this study is to find out methods of estimating the fluctuating concentration of airborne particles in the room. Therefore, surveys were carried out at four big hospitals including surgical operation rooms. This report is composed of the following studies as Part 1. 1) Surveys at four big hospitals; By using light scattering measurements, concentrations by count base above certain diameters (0.5, 1.0, 3.0, 5.0, 10.0μm) have been simultaneously obtained. The surveys were daily carried out for 11 hours continuously (7 : 00∿18 : 00), considering particle size distribution and fluctuating concentration. Results on the necessity of estimating size distribution and fluctuation were concluded. 2) Some considerations over size distribution; According to statistical analysis, the probability of concentration is presented by log-normal distribution at a short time interval of the estimation process. Through relationship in concentrations among various diameters of the same particles, correlation coefficients matrices were classified into five patterns. Since light scattering measurements have limits in measuring diameter, the estimation of particles distribution of whole body has been theoretically obtained by using the log-normal distribution. Furthermore, through analysis of log-normal and log-log representation, it has been found that the latter could be applied for estimating the distribution of airborne particles in the room.
