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Area dosimeter: What are your duties regarding area and environmental dose monitoring?

In addition to individual dose monitoring of classified workers, area and environmental monitoring are often imposed by country regulation.

These controls are performed in controlled areas or adjacent areas classified as public. They are also performed outdoor especially for perimeter monitoring of Nuclear facilities.

These measurements are usually carried out by an area or environmental dosimeter in H*(10).


Area monitoring is one of the instrument to ensure compliance of controlled areas and public areas adjacent to each room containing a X ray generator or a source. It allows to detect any leakage in the X-ray generator or shielding defect on the source.

It ensures that your nuclear or industrial installation, hospital or facility is safe for you, your employees and visitors.

Dose monitoring are often carried out continuously with passive dosimeters over a period of 1 or 3 months.

To avoid any possible confusion, the area dosimeter is labeled in a different way as the other dosimeters (personal and control) with :

  • a green background
  • a square symbol
Backgound dosimeter
Wall mount for background dosimeter 

Dosimeter wall mount

The area dosimeter can, under no circumstances, replace a personal dosimeter.

‘Visitor’ dosimeters can be provided on request.

The area dosimeter should be placed either:

– in the room where the source is located. The location should be defined by the Radiation Protection Expert. It should be ideally mounted at chest height.

– in the adjacent rooms generally called a “public area”. It is the responsibility of the company to prove that the public is not being exposed to more than regulated dose limits. In many countries, this limit is set at 1 mSv/ year.

The results of the area dosimeters are available to the Radiation Protection Expert through LANDAUER direct web platform.

LANDAUER proposes you wall mounting support enabling easy and quick installation of your area dosimeter.