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6.2 CESIUM ISOTOPES SURFACE ACTIVITY STANDARDS
UNDER NRBU-97 STANDARD
Table D.9.1 (NRBU 97) – The lower limits of justification, absolutely justifiable
intervention levels and action levels for a decision on the permanent relocation
(shortened).
Absolutely
justifiable
Lower limits of
Criteria for as decision
intervention
justification *
levels** and action
levels***
The dose averted for the period of
0.2
1
resettlement, Sv
The dose averted for the first 12
0.05
0.5
months after the accident, Sv.
The density of radioactive
contamination of territory with long-
-2
lived radionuclides, kBq·m
:
●
137
Cs
400
4000
* The level of justification - the value of the averted dose is such that the benefits
(for health) from the introduced countermeasure would be less than the damage
caused by this intervention.
** The level of intervention - the level of the averted radiation dose, which when
being exceeded a specific countermeasure should be applied in the event of an
emergency or chronic exposure.
*** The level of action - the value being a derivative of the intervention levels,
which is expressed in terms of such indicators of radiation environment, which can
be measured: the absorbed dose rate in the air on an open terrain, volume activity
of radionuclides in the air, their concentration in food, radionuclides fallout density
in soil, etc.
92
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