Skip Content

What is a TLD network?

The HKO has maintained a TLD network under the ERMP since the late 1980s to measure ambient gamma doses accumulated over a long period. The network, comprising 27 monitoring points over the territory, provides a wide spatial coverage of ambient radiation monitoring in Hong Kong economically. A batch of five identical TLDs is placed at each site to ensure statistical accuracy. They are replaced once every three months and the amount of radiation exposure is measured by a reader.

TLD network of ERMP
TLD network of ERMP