6.1 Introduction
6.2 Materials and Methods
6.3 Results and Discussion
6.3.1 Source of Particulate 129I in the Niida River System
Sampling period | Suspended substance |
129I activity |
129I/127I ratio | |||
---|---|---|---|---|---|---|
Sampling month | Start date | End date | (g dry weight) | (mBq kg−1) | (×10−8) | |
2012 | December | 2012/12/6 | 2012/12/18 | 0.003 | n.a. | n.a. |
2013 | January | 2012/12/18 | 2013/1/22 | 0.35 | n.a. | n.a. |
February | 2013/1/22 | 2013/2/26 | 0.06 | n.a. | n.a. | |
March and April | 2013/2/26 | 2013/4/18 | 6.70 | 2.06 ± 0.05 | 4.02 ± 0.11 | |
May | 2013/4/18 | 2013/5/21 | 0.95 | n.a. | n.a. | |
June | 2013/5/21 | 2013/6/18 | 2.16 | 0.92 ± 0.03 | 2.52 ± 0.09 | |
July | 2013/6/18 | 2013/7/25 | 3.24 | 1.71 ± 0.06 | 3.24 ± 0.11 | |
August | 2013/7/25 | 2013/8/22 | 5.51 | 2.15 ± 0.07 | 4.14 ± 0.14 | |
September | 2013/8/22 | 2013/9/26 | 9.25 | 4.07 ± 0.20 | 4.39 ± 0.22 | |
October | 2013/9/26 | 2013/10/30 | 7.47 | 2.86 ± 0.11 | 4.83 ± 0.20 | |
November | 2013/10/30 | 2013/11/20 | 0.83 | n.a. | n.a. | |
December | 2013/11/20 | 2013/12/23 | 0.26 | n.a. | n.a. | |
2014 | January | 2013/12/23 | 2014/1/17 | 0.05 | n.a. | n.a. |
6.3.2 Flux of Particulate 129I in the Niida River System
Analysis period | Suspended substance flux |
129I activity |
129I flux | |||
---|---|---|---|---|---|---|
Analysis period | Start date | End date | (ton month−1) | (mBq kg−1) | (kBq month−1) | |
2013 | March | 2013/3/1 | 2013/4/1 | 45.1 | 2.06 | 0.09 |
April | 2013/4/1 | 2013/5/1 | 318 | 2.06 | 0.66 | |
May | 2013/5/1 | 2013/6/1 | 30.3 | n.a. | – | |
June | 2013/6/1 | 2013/7/1 | 110 | 0.92 | 0.10 | |
July | 2013/7/1 | 2013/8/1 | – | 1.71 | – | |
August | 2013/8/1 | 2013/9/1 | – | 2.15 | – | |
September | 2013/9/1 | 2013/10/1 | 1860 | 4.07 | 7.58 | |
October | 2013/10/1 | 2013/10/30 | 3160 | 2.86 | 9.03 |