Table 1 Overview on signal to noise ratios and contrast between roots and soil measured for the initial test series.

From: Capturing 3D Water Flow in Rooted Soil by Ultra-fast Neutron Tomography

texp [s/projection]

SNR flatfield

SNR projection

Contrast root-soil (radiograph), %

Contrast root-soil (tomographic slice), %

0.2

28.0

7.0

18

40

0.1

20.8

5.6

17

38

0.05

17.9

4.9

16

41

0.05

17.9

4.8

14

43