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Full activation of instruments in the radiation monitoring network

The Radiation Monitoring Network (RMN) consists of twelve fixed radiation monitoring stations which monitor the ambient gamma dose rates over the territory round-the-clock. The gamma dose rate readings are automatically transmitted to the HKO Headquarters. The station closest to Daya Bay is located at Ping Chau in Mirs Bay about 12 km to the southwest of the nuclear power stations.

Locations of the radiation monitoring stations

Locations of the radiation monitoring stations

Each monitoring station consists of a high pressure ionization chamber (HPIC), a radio-iodine sampler, a high volume air sampler and a total deposition collector. The radio-iodine sampler and the high volume air sampler are normally set at a standby mode. Ambient gamma dose rate is measured continuously by a sensor consisting of a HPIC and the associated electrometer. The one-minute mean gamma dose rate readings are then telemetered every minute to the central station at the HKO Headquarters. When the measured level at a certain monitoring station exceeds the pre-set alarm level, the station will enter into the emergency radiation monitoring mode and the radio-iodine sampler and high volume air sampler will automatically be switched on. The air particulates and radio-iodine samples, together with deposition samples, will be collected for analysis at the King's Park Radiation Laboratory.

 
Instruments at radiation monitoring station

Instruments at radiation monitoring station

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Last revision date: <19 Dec 2012>