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40 2 1 2 1 4 2

50 2.5 1.2 2.5 1.3 6 2.5

60 3 1.5 3 1.5 6.5 3.3

70 4 2 4 2 7.5 4.0

100 5 2.5 5 3 9.5 5.0

200 10 5 10 5 19 10

300 15 6.5 16 8 28 15

400 19 10 21 11 37 19

3. Definition of the contamination zone, in which the object was, using the
data of radiation detection.
The contamination zone is determined according the table. 8.7 or Figure 8.1
after recalculation measured radiation level on 1 hour after the accident by the
formula 8.2.

Table 8.7 – Characteristic of zones of radioactive contamination of the
area during a NPP accident
Index, zones name Radiation level one hour Dose of irradiation for
after the accident, the first year, rad
rad/hour

On the Inside On the On the Inside On the
outer of inside outer of inside
frontier zone frontier frontier zone frontier

M – Radiation Hazard 0.014 0.044 0.14 5 16 50
Zone

A – Low-Radiation 0.14 0.44 1.42 50 160 500
Zone

B – Medium-Radiation 1.42 2.43 4.2 500 860 1500
Zone

V – High-Radiation 4.2 7.56 14.2 1500 2740 5000
Zone

G – Extreme Caution 14.2 25.6 - 5000 9000 -
Zone

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