Table 2 Radioactivity of 134Cs and 137Cs and the radioactivity ratio of composite measurement samples at each sampling point. The CsMP ratio shows the radioactivity of CsMPs to the total radiocesium wiped on the tissue paper sample. The measurement error shows 1σ.

From: Radiocesium-bearing microparticles found in dry deposition fallout samples immediately after the Fukushima nuclear accident in the Kanto region, Japan

Sample

At the accident

CsMP Ratio (%)

134Cs (Bq)

137Cs (Bq)

134Cs/137Cs

Tokai1-20110320-all_CsMPs

8.30 ± 0.59

7.07 ± 0.03

1.17 ± 0.17

 

Tokai1-20110320-tissue_paper

24.0 ± 0.8

21.8 ± 0.2

1.10 ± 0.17

33.6

Tokai2-20110320-all_CsMPs

9.88 ± 0.91

8.99 ± 0.05

1.10 ± 0.10

 

Tokai2-20110320-tissue_paper

25.7 ± 1.1

24.3 ± 0.2

1.06 ± 0.11

37.8

Tokai3-20110320-all_CsMPs

11.2 ± 0.9

10.1 ± 0.1

1.10 ± 0.09

 

Tokai3-20110320-tissue_paper

24.9 ± 0.9

22.5 ± 0.2

1.10 ± 0.09

45.0

Tokai4-20110320-all_CsMPs

2.84 ± 0.31

2.48 ± 0.02

1.15 ± 0.13

 

Tokai4-20110320-tissue_paper

11.5 ± 0.6

11.5 ± 0.2

1.00 ± 0.14

23.2

Ushiku-20110317-all_CsMPs

0.517 ± 0.116

0.461 ± 0.006

1.12 ± 0.25

 

Ushiku-20110317-tissue_paper

7.22 ± 0.43

6.19 ± 0.11

1.17 ± 0.26

7.30

Ushiku-20110318-all_CsMPs

2.13 ± 0.25

2.09 ± 0.01

1.02 ± 0.12

 

Ushiku-20110318-tissue_paper

7.19 ± 0.45

7.13 ± 0.10

1.01 ± 0.14

29.4

Ushiku-20110320-all_CsMPs

11.2 ± 0.7

9.83 ± 0.04

1.14 ± 0.19

 

Ushiku-20110320-tissue_paper

23.4 ± 0.8

21.7 ± 0.2

1.08 ± 0.20

46.6

Abiko-20110321-all_CsMPs

3.31 ± 0.38

2.91 ± 0.02

1.14 ± 0.13

 

Abiko-20110321-tissue_paper

16.9 ± 0.6

16.6 ± 1.4

1.02 ± 0.17

18.6

Chiba-20110321-all_CsMPs

0.278 ± 0.114

0.274 ± 0.005

1.02 ± 0.42

 

Chiba-20110321-tissue_paper

2.73 ± 0.22

2.78 ± 0.05

0.980 ± 0.359

10.0

Kawaguchi-20110316-all_CsMPs

3.17 ± 0.36

2.64 ± 0.02

1.20 ± 0.14

 

Kawaguchi-20110316-tissue_paper

12.6 ± 0.6

12.1 ± 0.1

1.04 ± 0.15

23.5

Kawaguchi-20110320-all_CsMPs_1 + 2

2.00 ± 0.21

1.72 ± 0.01

1.17 ± 0.34

 

Kawaguchi-20110320-tissue_paper_1 + 2

6.20 ± 0.43

5.66 ± 0.09

1.10 ± 0.35

31.4

Arakawa-20110317-all_CsMPs

6.00 ± 0.44

5.33 ± 0.03

1.12 ± 0.08

 

Arakawa-20110317-tissue_paper

13.5 ± 0.6

12.9 ± 0.1

1.04 ± 0.10

42.9

  1. The total radioactivity of the composite measurement samples might be underestimated, and the radioactivity of the tissue paper samples could have greater uncertainty than individual counting errors.
Back to article page