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In the case of overcoming the contamination zone, the radiation dose is

calculated by the same formula in which , where l – length of the route, km;

V – travelling speed, km/hour:

rad/hour, (8.5)

where P , P , …, P – the radiation levels at the individual points of the route at the
1
2
n
time of overcoming zone, rad/year, n – number of points.
The exact value of the received dose of radiation is calculated according to
the formulas after integrating the function of the decrease the level of radiation and
subsequent transformations:
a) for reactor VVER-1000:

, rad (8.6)

or
, rad (8.7)

b) for reactor RBMK-1000:

, rad (8.8)

or
, rad (8.9)

5. Determination of the permissible duration of stay (work) in the
contamination zone t w.permis.
The allowed duration of work in the contamination zone are determined by
graphs Figure 8.2 and 8.3, if the start time t start and established dose of radiation
D est. are known, or make calculation by formulas:
a) for reactor VVER-1000:

, hour (8.10)

b) for reactor RBMK-1000:

, hour (8.11)

where a – relative value, which is determined by the formula:
;

P – radiation level on 1 hour after the accident, rad/hour;
1
K red. – coefficient of reduction of radiation levels by buildings, structures and
vehicles, in which people are;
D . – established dose of radiation, rad.
est
Acceptable start of work is determined by the graph (Figure 8.2, 8.3), if the
duration of work t and established dose of radiation D are known.
est.
w
6. Definition of measures to protect the population in the early phase of
radiation accident (according to table 8.9).
7. Determination of possible radiation losses of people.

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