Table 1: Apparent atmospheric half-lives of FDNPP-derived 90Sr during the period of March 2011 to May 2011.
*AAHL was calculated in the period of April to July because 90Sr maximum was observed in April 2011.
Abbreviations: AAHL: Apparent Atmospheric Half Life, Monitoring stations, AK: Akita, MO: Morioka, YM: Yamagata, FB: Futaba, UM: Utsunomiya, HN: Hitachinaka, T: Tsukuba, TK: Tokyo, IK: Ichihara, CS: Chigasaki, SO: Shizuoka, KF: Kofu, NN: Nagano, NG: Niigata, TY: Toyama, MH: Maehashi.
| Station name | Location | AAHL (days) |
| MO | 39.68°N, 141.13°E | 27±19* |
| YM | 38.25°N, 140.33°E | 11±2 |
| FB | 37.40°N, 140.99°E | 11±3 |
| HN | 36.39°N, 140.43°E | 44±16 |
| UM | 36.60°N, 139.94°E | 42±21 |
| T | 36.10°N, 140.10°E | 36±20 |
| MH | 36.40°N, 139.10°E | 19±1 |
| TK | 35.71°N, 139.70°E | 30±11 |
| IK | 35.53°N, 140.07°E | 18±3 |
| CS | 35.33°N, 139.38vE | 26±6 |