Groundwater Vulnerability and Protectability to Chernobyl-Born Radionuclide - Groundwater Vulnerability: Chernobyl Nuclear Disaster - page 100

Legend:

A: B: C:

kBq/km 2 Ci/km 2 mBq/l

Pripyat

<3,7·10 -5 (<10 -6 ) < 3·10 -5

3,7·10 -5 -3,7·10 -4 (10 -6 -10 -5 )

(10 -5 -10 -4 )
(10 -4 -0,001)
(0,001-0,01)
(0,01-0,1)
(>0,1)

3·10 -5 -3·10 -4

Chernobyl

3,7·10 -4 -0,0037

3·10 -4 -0,003
0,003-0,03
0,03-0,3
0,3-3

0,0037-0,037

0,037-0,37

0,37-3,7

>3,7 >3

- Zones of upward flow

Irpen

Brovary

Kyiv

Borispol

Boyarka

Berezan

Vasilkov

Obukhov

Pereyaslav-Khmelnitsky

0 10 20 km

Figure 5.12 Vulnerability map of the Eocene aquifer to contamination with 137 Cs: (A, B)
assessment of cover vulnerability of the aquifer in units of surface contamination density;
(C) assessment of full groundwater vulnerability with account of aquifer capacity (in units
of predicted concentration). Forecast period 30 years.

According to the World Health Organization, the MAC for emergency conditions
for these nuclides is 10 Bq/dm 3 .
Hence, according to the obtained assessments, even in conditions of high
surface radioactive contamination in the CEZ, groundwater contamination of
the aquifers with 137 Cs within most of the area remains below the MAC approved
for water supply purposes.