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Conduction of emergency radiological surveys

The objective of emergency radiological surveys is to enhance the spatial coverage of the monitoring of the ambient gamma dose rates, especially over sea areas between the nuclear power stations and Hong Kong as well as over remote areas of the territory. In the unlikely event of a nuclear accident, one aerial survey team and two mobile survey teams can be deployed within an hour.


Aerial Radiation Monitoring System

Aerial Radiation Monitoring System

 

The aerial survey team makes use of the Aerial Radiation Monitoring System on board a helicopter of the Government Flying Service (GFS) to determine any radioactive plume over Hong Kong and locate the affected areas. After passage of the plume, the system can be operated to identify surface areas contaminated by deposited radionuclides. Survey results collected are reported to the HKO Headquarters in near real-time.

 

Radiological Survey Vehicle

Radiological Survey Vehicle

 
One of the mobile survey teams makes use of the Radiological Survey Vehicle to carry out in-situ radiation measurement and collect samples. The vehicle is equipped with portable or specially designed instruments. The survey team conducts surveys at sites along selected survey routes in Hong Kong. It measures ambient gamma dose rates, surface activity concentrations of beta emitters at ground surface and in-situ gamma spectrum of land soil. Airborne particulates, radio-iodine, smear and other environmental samples are also collected at the survey sites. Another mobile survey team, travelling on GFS helicopters, visits survey sites at three outlying islands, Ping Chau, Tap Mun and Kat O in Mirs Bay, to carry out in-situ radiation measurements and collect samples.
 

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Last revision date: <19 Dec 2012>