CIVA RT

RADIOGRAPHIC MODULE

The RT simulation module allows to calculate the direct or scattered radiation produced by an X-ray or a Gamma-ray source in a component that can includes one or several flaws.

CIVA Radiography

SOURCE

For X-rays, one defines the spectrum of the source:

  • either by entering the material and orientation of the anode, the acceleration voltage and a possible filter
  • either by directly selecting the source among a predefined spectrum catalogue

For Gamma-rays, one chooses the radioactive source among three available isotopes (Cobalt 60, Iridium 192 & Selenium 75). This is also possible to manually enter the energy rays.

Intensity (X-rays) or activity (Gamma-rays) can be parameterized by the user.
The source effective size can be accounted for in order to reproduce geometrical blurring phenomena.

DETECTOR

Detectors (planar or curved) depend on source type.
For Gamma-rays, about 15 films of different classes are proposed in a library among the most currently found in the industry (Fuji, Kodak, Agfa).
For X-rays, once entered the main properties of the detector (pixel size and number, gain, Defective Quantum Efficiency), the material of the sensitive layer of the film is defined.

For all kind of sources, a filter can be put in front of the detector.

WORKPIECE

The component geometries available in this module are parametric and CAD ones :

  • Planar, cylindrical, conical, elbow or nozzle
  • 2.5D CAD, built from a 2D complex profile with linear or cylindrical extrusion
  • 3D CAD

CAD geometries can be imported from these standard formats: DXF, IGES, STEP, STL.
Workpieces can be homogeneous or heterogeneous. The material properties can be extracted from a library including more than 110 materials (simple and alloys) giving cross-section data.

CIVA Radiography Piece

FLAW

Different types of flaws can be inserted in the controlled test-piece:

  • Parallelepipedic
  • Spherical
  • Ellipsoidal
  • Trapezoidal (planar or curved)
  • 3DCAD
  • Flat Bottomed Hole or Hemispherical Bottomed Hole
  • Side Drilled Hole

The model does simulate void flaws as well as solid inclusions, for all kind of flaw geometries defined above.

CIVA Radiography Flaws

RESULTS

The model is based on two engines (analytical model of “Beer-Lambert” & Monte-Carlo) allowing to compute both direct and scattered radiation.

CIVA Radiography Results
The fusion of results allows to visualize both phenomena on the same radiograph and to quantify them with “build-up” data.
The results are presented as grey levels and optical density charts and curves (direct, scattered, horizontal and vertical cross-section of the deposited energy…).
The obtained images can be exported in Tiff format.
For each indication of grey level, the thickness of materials passed through are indicated.
A statistical tool that plots photons paths allows to reproduce visually the effect of the different photons-matter absorption and interaction phenomena.

CIVA Radiography Results