Table 1 Summary of 134Cs/137Cs activity ratios (derived by gamma-ray spectroscopy) and the associated measurement uncertainties (2σ) for the representative particulates studied in this work, alongside the attributed FDNPP reactor Unit. *Decay corrected to March 2011.

From: Structural and compositional characteristics of Fukushima release particulate material from Units 1 and 3 elucidates release mechanisms, accident chronology and future decommissioning strategy

Particle reference

134Cs + 137Cs activity ± 2σ (kBq)*

134Cs/137Cs activity ratio* (± 2σ)

FDNPP reactor unit

CF-01-1

37.2 ± 0.62

0.93 ± 0.02

1

CF-01-T18

0.22 ± 0.02

0.94 ± 0.03

1

CF-01-R024

10.6 ± 0.50

0.94 ± 0.02

1

CF-01-T06

0.36 ± 0.03

0.93 ± 0.03

1

CF-01-T009

14.2 ± 0.44

0.92 ± 0.02

1

OH-06-07

0.17 ± 0.02

1.03 ± 0.03

3

OH-06-10

0.08 ± 0.01

1.03 ± 0.04

3

OH-02-01

3.16 ± 3.16

1.05 ± 0.03

3

OH-02-01

2.18 ± 2.18

1.04 ± 0.03

3

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