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IMPACT ON PEOPLE AND THE ENVIRONMENT
Dose

DEFINITION OF LEVEL 3 FOR A SINGLE EXPOSED PERSON

 

The Level 3 definition has two criteria.

 

The occurrence or likely occurrence of a non-lethal deterministic effect

This first criteria relates to deterministic effects.

It may be that deterministic effects are not observed immediately following the event, but are seen only after some period of time.

In this situation, Appendix II on page 159 gives you information on the size of exposure that is likely to lead to various deterministic effects.

 

Exposure leading to an effective dose greater than ten times the statutory annual whole body dose limit for workers

This second criterion relates to stochastic effects.

This level of exposure results in an increase in stochastic risk that is considered significant enough to be rated at Level 3.

Note that although the definition is in terms of worker dose limits, the definition applies equally to members of the public.

Note also that the statutory annual whole body dose limit for workers is not the same in all countries - generally it is either 20 mSv or 50 mSv.

Appendix II

THRESHOLD LEVELS FOR DETERMINISTIC EFFECTS
The criteria related to deterministic effects in Section 2.3.1 are intended to relate to observable deterministic effects. However, if it is not known at the time of rating whether a deterministic effect will actually occur, the data in this appendix can be used to determine a rating based on dose.