Table 3 Particle size distribution and respiratory deposition estimate for radioactive cesium in Fukushima Prefecture
Sampling site | Date (2011) | Andersen low-volume sampler, 224 m3 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fraction (μm) | Dust amount (mg) | Radioactivity (mBq/m3-air) | |||||||||||
134Cs | 137Cs | ||||||||||||
Fukushima | 37°45′42″N 140°28′18″E | 7/2–7/8 | 100–11.4 | 0.7 | 0.4 | 0.3 | |||||||
11.4–7.4 | 1.1 | 0.3 | 0.3 | ||||||||||
7.4–4.9 | 1 | 1.0 | 0.4 | ||||||||||
4.9–3.3 | 0.9 | 0.5 | 0.6 | ||||||||||
3.3–2.2 | 0.6 | 0.3 | 0.2 | ||||||||||
2.2–1.1 | 0.8 | 0.3 | 0.2 | ||||||||||
1.1–0.7 | 1.3 | 0.8 | 0.4 | ||||||||||
0.7–0.46 | 1.3 | 1.5 | 1.1 | ||||||||||
<0.46 | 0.9 | 1.5 | 1.3 | ||||||||||
Total | 8.6 | 6.5 | 4.7 | ||||||||||
Respirable | <4.9 | 5.8 | 4.8 | 3.8 | |||||||||
Sampling site | Date (2011) (weather) | High-volume air sampler | Ambient dose rate | Radioactivity in soil (Bq/kg) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Air volume sampled (m3) | Dust amount (mg) | Radioactivity in air (mBq/m3-air) | Estimated dosea (μSv/year) | ||||||||||
134Cs | 137Cs | 134Cs | 137Cs | Total | (μSv/h) | 134Cs | 137Cs | n | |||||
Fukushima | 37°45′42″N 140°28′18″E | 2011/7/2 (F) | 473 | 6.8 | 1.9 | 3.0 | 0.3 | 0.8 | 1.1 | 1.2 | NA | NA | |
Date | 37°47′10″N 140°33′26″E | 2011/7/3 (CL) | 94 | 3.5 | 7.9 | 6.4 | 1.1 | 1.8 | 3.0 | 0.9 | 3,232 ± 2,666 | 3,855 ± 3,047 | 5 |
Fukushima | 37°39′26″N 140°32′11″E | 2011/7/3 (CL) | 83 | 1.9 | 4.7 | 1.5 | 0.7 | 0.4 | 1.1 | 1.0 | 2,515 ± 859 | 3,059 ± 1,077 | 5 |
Fukushima | 37°45′42″N 140°28′18″E | 2011/7/4 (R) | 450 | 8 | 1.6 | 1.5 | 0.2 | 0.4 | 0.6 | 1.2 | NA | NA | |
Souma | 37°46′1″N 140°57′2″E | 2011/7/5 (F) | 88 | 0.7 | 0.6 | 0.2 | 0.1 | 0.1 | 0.1 | 0.5 | 1,710 ± 2,365 | 2,116 ± 2,976 | 5 |
Minami-Souma | 37°38′29″N 140°55′30″E | 2011/7/5 (F) | 84 | 2.4 | 0.7 | 1.1 | 0.1 | 0.3 | 0.4 | 0.9 | 1,772 ± 411 | 2,151 ± 546 | 5 |
Souma | 37°46′8″N 140°43′1″E | 2011/7/5 (F) | 84 | 1.3 | 1.1 | 2.3 | 0.2 | 0.7 | 0.8 | 1.6 | 1,723 ± 1,792 | 2,047 ± 2,174 | 5 |
Fukushima | 37°45′42″N 140°28′18″E | 2011/7/5 (F) | 220 | 4 | 2.9 | 3.4 | 0.4 | 1.0 | 1.4 | 1.2 | NA | NA | |
Nihonmatsu | 37°33′21″N 140°27′34″E | 2011/7/6 (F) | 93 | 0.1 | 0.6 | 0.6 | 0.1 | 0.2 | 0.3 | 1.2 | 12,184 ± 12,170 | 14,202 ± 14,025 | 5 |
Nihonmatsu | 37°33′21″N 140°30′43″E | 2011/7/6 (F) | 53 | 0.3 | 4.2 | 7.3 | 0.6 | 2.1 | 2.7 | 1.9 | 1,895 ± 674 | 2,244 ± 755 | 5 |
Kawamata | 37°36′14″N 140°38′49″E | 2011/7/6 (CL) | 72 | 0.4 | 6.3 | 6.1 | 0.9 | 1.7 | 2.7 | 2.0 | 3,931 ± 4,856 | 4,741 ± 5,929 | 5 |
Fukushima | 37°45′42″N 140°28′18″E | 2011/7/6 (CL) | 246 | 4 | 5.3 | 7.6 | 0.8 | 2.2 | 2.9 | 1.2 | NA | NA | |
Fukushima | 37°45′42″N 140°28′18″E | 2011/7/7 (CL) | 259 | 5.3 | 1.9 | 2.5 | 0.3 | 0.7 | 1.0 | 1.2 | NA | NA | |
Iitate | 37°36′44″N 140°44′52″E | 2011/7/7 (CL) | 84 | 1.7 | 24.6 | 38.9 | 3.6 | 11.1 | 14.7 | 9.0 | 18,531 ± 11,235 | 23,185 ± 15,664 | 5 |
Namie | 37°33′38″N 140°45′39″E | 2011/7/7 (CL) | 84 | 1.7 | 148.2 | 194.2 | 21.6 | 55.3 | 76.9 | 13.0 | 13,548 ± 10,469 | 16,216 ± 12,653 | 5 |
Katsurao | 37°31′33″N 140°48′21″E | 2011/7/7 (CL) | 84 | 1.5 | 65.0 | 64.0 | 9.5 | 18.2 | 27.7 | 10.0 | 16,332 ± 11,170 | 16,799 ± 10,058 | 5 |