Table 1 Ambient dose rate in the interim storage facility (ISF) area and evacuation order lifted area in Futaba town from October 2021 to November 2022.
Survey date | ISF | Evacuation order lifted area | ||
|---|---|---|---|---|
Measurement points | Median (min–max) (μSv/h) | Measuring points | Median (min–max) (μSv/h) | |
19/10/2021 | 887 | 0.21 (0.050–1.8) | 477 | 0.059 (0.029–0.63) |
20/11/2021 | 1800 | 0.20 (0.048–1.8) | 746 | 0.062 (0.029–0.60) |
18/12/2021 | 1701 | 0.21 (0.039–2.0) | 781 | 0.064 (0.029–0.51) |
28/5/2022 | 1450 | 0.16 (0.042–1.3) | 778 | 0.086 (0.025–1.0) |
25/6/2022 | 1266 | 0.16 (0.032–1.3) | 697 | 0.060 (0.025–0.71) |
23/7/2022 | 1189 | 0.15 (0.040–1.3) | 727 | 0.053 (0.020–0.49) |
27/8/2022 | 1178 | 0.21 (0.034–1.6) | 600 | 0.070 (0.030–0.68) |
17/9/2022 | 1185 | 0.19 (0.035–1.5) | 567 | 0.067 (0.027–0.82) |
15/10/2022 | 1109 | 0.19 (0.040–1.5) | 579 | 0.083 (0.024–0.72) |
19/11/2022 | 1147 | 0.21 (0.049–1.9) | 585 | 0.083 (0.030–0.85) |
Annual estimated effective doses of workers in mSv/year (average) | 0.17 | Annual estimated effective doses of residents in mSv/year (average) | 0.091 | |
