Getting Started: wcΒΆ

I. OVERVIEW

The ‘RP_wc’ analysis creates a volumetric water content map from the specified image using equations outlined in Kang et al., 2013 [1]. This analysis assumes that the images are in a quasi-2D (i.e. thin plate) form, with soil held together by two aluminum plates.

Input image must be a neutron transmission image.

II. HOW TO USE

First, open the ‘user_config’ text file in your ‘Root_Processing’ directory. The parameters used in ‘RP_wc’ are in the 3rd section, and there will be eight parameters. In order, they are:

  1. image_filename: this is the full image filename (including directory) where the image is to be found.
  2. output_filename: this is the full image filename (including directory) where the image is to be saved. If the directory is not present, the analysis will automatically make the directory.
  3. b_w: scattering coefficient of water [cm^-2]
  4. s_w: attenuation coefficient of water [cm^-2]
  5. s_a: attenuation coefficient of aluminum [cm^-1]
  6. s_s: attenuation coefficient of silicon [cm^-1]
  7. x_s: thickness of soil [cm]. This is the thickness of the soil in the neutron beam direction.
  8. x_a: thickness of aluminum [cm]. This is the thickness of the aluminum plates (in total, so both plates) in the neutron beam direction.

III. RUNNING THE CODE

This analysis can be conducted using the [‘RP_wc’] string in the ‘RP_run’ module.

[1]Kang, M et al., “Water calibration measurements for neutron radiography: Application to water content quantification in porous media.” Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 708 (2013):24-31.