# DEFINITION OF LEVEL 1 AND 2 FOR A SINGLE EXPOSED PERSON

Events resulting in deterministic effects are rated at Level 3 and 4, using the criteria we have just seen. Therefore, the criteria for Levels 1 and 2 only relate to stochastic effects.

There are different criteria for workers and members of the public as dose limits are lower for the public than for workers.

Exposure of a worker in excess of statutory annual dose limits

Exposure of a member of the public leading to an effective dose in excess of 10 mSv

Note that the definition here includes all the statutory dose limits including whole body effective dose, doses to skin, doses to extremities and doses to the lens of the eye.

Exposure of a worker in excess of dose constraints

Exposure of a member of the public in excess of statutory annual dose limits

Dose constraint is a value below the statutory dose limit that maybe be established by the country.

Note that the interpretation of dose constraints varies from one country to another and you need to understand how it is interpreted in your national context.

The whole body dose limit will most commonly be applicable and this is generally 1 mSv.

This definition really belongs to the defence in depth area, but it is included here for completeness.