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Virtual water stack 1400

Machine QA

Virtual Water® Phantom True Water-Equivalent Material

Ideal alternative to traditional water tanks for performing routine QA checks of a linear accelerator using photon or electron beams.

Virtual Water® Phantom Download:

Virtual Water® Phantom Overview

Tested and Calibrated: Each batch of Virtual Water is tested at an independent calibration lab and verified to be within 0.5% of water at photon energies.

Slabs from this unique material are exceptionally strong and will not stick together when stacked or stored. It's not affected by changes in humidity or temperature and does not exhibit charge storage effects, a problem common in other water-equivalent materials.

Setting the Standard in Water-Equivalency: Slabs are made from water-equivalent material, and are developed to be free of contaminants and air.

Virtual Water Specifications

  • Mass Density (g/cm3)
    1.04 g/cm3
  • Electron Density (e-/cm3NA)
    0.557 +/- 0.001
  • Virtual Water/ Water Electron Density Ratio
    1.000 +/- 0.005
  • Depth Ionization Relative-to-Water- Photons
    1.000 +/- 0.005
  • Depth Ionization Relative-to-Water- Electrons
    1.000 +/- 0.005
  • Water Equivalency
    Photon & Electron Range -0.5%
  • Batch Consistency
    +/- 0.02% Measured
  • Thickness Tolerance
    +/- 0.15 mm (0.006 in)
  • Length and Width Tolerance
    +/- 0.5 mm (0.02 in)
  • Flatness
    0.2 mm (0.008 in)
  • Sizes Available
    20 cm, 30 cm, 40 cm (Standard)
  • Thicknesses Available
    0.1 cm, 0.2 cm, 0.3 cm, 0.4 cm, 0.5 cm, 1.0 cm, 2.0 cm, 3.0 cm, 4.0 cm, 5.0 cm, 6.0 cm (Standard)
  • Other Options
    Milled for Parallel Plate Chamber or Drilled Cavity for Ion Chamber
  • Specifications Material
    Epoxy resins and powders to control density and radiation properties.


Tech Notes

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