Table 3. Distribution of detected artificial radionuclides and 40K, and 134Cs: 137Cs ratios in needles collected at Kawauchi Village, Fukushima Prefecture.
| Points | Distance fromFNPP (km) | Radionuclide concentration in Bq/kg-dry | Radionuclide ratio | ||
| 134Cs (2.1 y)a | 137Cs (30 y) | 40K (1.3×109 y) | 134Cs/137Cs | ||
| 1-C | 25.5 | 2880±27b (23)c | 3576±31 (18) | 139±30 (78) | 0.81 |
| 2-B | 22.2 | 1159±14 (12) | 1484±16 (10) | 76.4±19 (51) | 0.78 |
| 3-E | 21.8 | 1737±19 (16) | 2168±21 (13) | 67.8±22 (65) | 0.80 |
| 3-J | 21.5 | 3842±18 (14) | 4948±21 (12) | 72.1±14 (38) | 0.78 |
| 5-B | 20.5 | 1796±18 (15) | 2308±20 (12) | 78.2±22 (62) | 0.78 |
| 6-C | 22.4 | 25062±59 (47) | 31829±68 (37) | 90.4±27 (80) | 0.79 |
| 7-B | 25.1 | 9845±44 (35) | 12400±50 (28) | 93.1±26 (75) | 0.79 |
| 7-C | 25.1 | 13074±43 (33) | 16404±50 (28) | 102±23 (61) | 0.80 |
| 7-E | 23.5 | 146±5.0 (6.2) | 191±5.7 (4.8) | 71.9±21 (62) | 0.77 |
| 7-G | 20.8 | 245±7.5 (8.7) | 291±8.2 (7.3) | 192±29 (59) | 0.84 |
| 8-E | 16.8 | 20824±57 (45) | 26345±65 (36) | 108±25 (70) | 0.79 |
| 8-F | 16.8 | 33590±70 (55) | 42576±81 (44) | 110±28 (80) | 0.79 |
| 8-H | 14.9 | 2470±18 (15) | 3162±21 (13) | 101±18 (43) | 0.78 |
a
half-life.
b
error shows one sigma standard deviation from counting statistics.
c
detection limit.