Geoscience Reference
In-Depth Information
Table 6.14 Results of measurements of the content of radionuclides in river bottom sediments made in July 1996 (averaged data of isotopic activity, Bq/kg of
dry weight)
Place of sampling
60
Co
137
Cs
152
Eu
235
U
238
U
Angara River
Up the Irkutsk dam (I1)
<2.0
2.2
±
1.0
<3.1
<1.9
<280
Down the Irkutsk dam (I2)
<3.5
<3.6
<5.3
27.2
±
4.6
720
±
300
Below Irkutsk (I3)
<3.7
30.6
±
2.6
<5.1
<3.7
<580
Angarsk (technical canal) (A1)
<2.0
<1.8
<3.1
<1.7
<320
Up Angarsk (A2)
<4.1
25.2
±
3.1
<6.0
<4.2
<630
Up the Bratsk dam (B1)
<2.3
<2.3
<3.9
<2.2
<420
3.4
±
1.2
Down the Bratsk dam (B2)
<2.6
<4.0
<2.5
<440
Before the
fl
ow of Angara into Yenisey River (J1)
<1.9
2.2
±
1.0
<2.8
<1.7
<290
Yenisey River
Up Kazachinskoye (J2)
8.6
±
1.9
22.9
±
2.3
6.7
±
3.0
<2.7
<500
Kazachinskoye (J3)
241
±
11
392
±
12
151
±
27
<8.2
<1,340
Down Kazachinskoye (J7)
30.1
±
3.0
203
±
5
42.3
±
9.5
<3.8
<680
Below Lesosibirsk (J6)
<5.7
27.1
±
3.8
<8.2
<6.4
<860
Strelka, at the junction (J4)
96.9
±
5.1
211
±
6
55.7
±
13.5
<4.5
<840
Places of sampling are marked in the map in Fig.
6.14
and are listed in Table
6.15
. Errors given are
±
2 standard deviations. The sign
“
<
”
indicates less than the
minimum detectable concentration, which is given at the 90 % con
dence level. Sample J7 was taken in the
fl
ood plane of the Yenisey River above the
junction. The locations of the rest of the samples are given in Table
6.15
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