Emergency radiation monitoring in early phase primarily serves the purpose of verifying that there is no significant radioactive plume or deposition over Hong Kong. In case there is an accident resulting in the release of radioactive materials that affect the territory, emergency radiation monitoring will rapidly determine the concentration and distribution of the radioactive materials over the territory for assessing nuclear accident consequences and considering necessary countermeasures.
As it is necessary to obtain timely information, early phase monitoring focuses on the measurement of ambient gamma dose rates, concentrations of gamma-emitting radionuclides and gross alpha/beta levels. To ensure that timely monitoring results can be obtained with minimal personnel exposure, remote sensing technology is applied as far as possible.
Emergency radiation monitoring in early phase includes: