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IMPACT ON PEOPLE AND THE ENVIRONMENT
Dose

THE MANUAL, PAGE 21–22, TABLE 3

 

If we put together all the criteria we have now looked at, we get the table below, which is also Table 3 from the Manual. Take a look at pages 21 and 22. You may wish to mark this page in your Manual to make it easy to find!

Level of exposure

Min rating

Number of individuals

Actual rating

The occurrence of a lethal deterministic effect or the likely occurrence of a lethal deterministic effect as a result of a whole body absorbed dose of the order of a few Gy

Few tens or more  a
Between several and a few tens
Less than several

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

Few tens or more
Between several and a few tens
Less than several

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

100 or more
10 or more
Less than 10

Exposure of a member of the public leading to an effective dose in excess of 10 mSv or exposure of a worker in excess of statutory annual dose limits

100 or more
10 or more
Less than 10

Exposure of a member of the public in excess of statutory annual limits or exposure of a worker in excess of dose constraints

100 or more
10 or more
Less than 10  b

Cumulative exposure of workers or members of the public in excess of statutory annual dose limits

1 or more  b

 

Level 6 is not considered credible for any event involving radiation sources.

As explained in Section 2.4, the Level 1 definitions are based on defence-in-depth criteria explained in chapters 4–6, but they are included here for completeness.