It is difficult to objectively estimate the exposure level of
subjects in studies investigating environmental calamities
caused by accidental chemical substance leakage. Although
we measured the airborne concentrations of chlorine
gas released across the community concerned 2 h
after the accidental leakage, this was not enough to quantitatively
estimate the individual exposure levels of the
subjects. Officially confirmed exposure data was very important
to describing health effects. In unexpected community
environmental accident, timely environmental
exposure monitoring is essential to prevent and evaluate
health effects of victims. In a previous study investigating
the accidental release of hydrogen fluoride that occurred
in Gumi-si in September 2012 [36], patients’ individual exposure
levels of were not known, and the distance from
the leakage site was used as a proxy marker. The distance
from the leakage site was also used in our study as an indicator
indirectly reflecting the subjects’ exposure levels.
There were many other factors that influences the exposure
level of individual victims, such as wind direction,
exact location of victims. But, we could not collect data
about exact location of individual patient at the time of
exposure except distance from accident site. If the patient
was working in a space with all closed windows or doors,
he would be minimally affected by the chlorine exposure,
even though he was within 100 meters radius.
It is difficult to objectively estimate the exposure level ofsubjects in studies investigating environmental calamitiescaused by accidental chemical substance leakage. Althoughwe measured the airborne concentrations of chlorinegas released across the community concerned 2 hafter the accidental leakage, this was not enough to quantitativelyestimate the individual exposure levels of thesubjects. Officially confirmed exposure data was very importantto describing health effects. In unexpected communityenvironmental accident, timely environmentalexposure monitoring is essential to prevent and evaluatehealth effects of victims. In a previous study investigatingthe accidental release of hydrogen fluoride that occurredin Gumi-si in September 2012 [36], patients’ individual exposurelevels of were not known, and the distance fromthe leakage site was used as a proxy marker. The distancefrom the leakage site was also used in our study as an indicatorindirectly reflecting the subjects’ exposure levels.There were many other factors that influences the exposurelevel of individual victims, such as wind direction,exact location of victims. But, we could not collect dataabout exact location of individual patient at the time ofexposure except distance from accident site. If the patientwas working in a space with all closed windows or doors,he would be minimally affected by the chlorine exposure,even though he was within 100 meters radius.
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