Annex 10

(Art. 80 para. 2 let. b, 82 para. 1 and 2, 85 para. 2 let. b)

Zone types and area types

1. Depending on the degree of contamination which is present or to be expected, zones shall be classified into the following zone types:

Zone type	Surface contaminationC s	Airborne contaminationC A
0	C S< 1.CS1	C A< 0.05.CA2
I	C C< 1.CS	0.05.CA ≤C A< 0.1.CA
II	1.CS ≤C S< 10.CS	0.05.CA ≤C A< 0.1.CA
III	10.CS ≤C S< 100.CS	0.1.CA ≤C A< 10.CA
IV	C S≥ 100.CS	C A≥ 10.CA

If the degrees of airborne and surface contamination do not call for the same zone type, the more restrictive factor shall be decisive.

2. Within zones where ambient dose rates are elevated, for the planning and regulation of individual doses, the following areas must be designated with maximum permissible ambient dose rates:

Area type	Ambient dose rateD at accessible locations
V	D < 0.01 mSv/h
W	0.01 <D < 0.1 mSv/h
X	0.1 <D < 1 mSv/h
Y	1 <D < 10 mSv/h
Z	D > 10 mSv/h

Footnotes

1. Guidance value (Bq/cm²) for surface contamination as specified in Annex 3 Column 12; averaged over 100 cm². ↩

2. Guidance value (Bq/m³) for chronic airborne activity as specified in Annex 3 Column 11. ↩