Table 2 The average UO2 thickness observed on each uranium sample.

From: In-situ, time resolved monitoring of uranium in BFS:OPC grout. Part 1: Corrosion in water vapour

Sample

Oxide thickness (µm)

Error+/− (µm)

Range (µm)

A1

5.82

0.66

6.79

A3

5.88

1.08

10.54

A6

6.16

1.43

14.59

A47

7.93

0.50

36.16

A50

7.16

0.50

54.97

N1

3.00

1.20

6.19

N2

3.72

0.50

10.91

N6

4.87

0.50

24.46

N12

5.80

0.50

13.82

N22

5.25

0.50

10.02

  1. Measurements were obtained from 80 locations on multiple cross sections of the XRT 3D renders. Errors in measurements were caused by X-ray edge artefacts, micro-porosity in the UO2 and minor overlapping of phase densities between the grout and UO2. Error estimates were obtained by measuring the oxide thickness three times: at the lowest, middle and highest threshold x-ray signal perceived to represent the UO2 for rendering the 3D image. The middle measurement was then used as the final value, with the associated maximum and minimum measurement value error range. The range column represents the range in thicknesses across the surfaces of each sample, which varied according to the geometry of the sample surface. For example, the corners of each rectangular sample generally exhibited greater oxide thicknesses than the flat face surfaces.
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