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X-rays interact with matter. The relevant interactions processes are photo-ionization, elastic and inelastic scattering – they cause the attenuation of an x-ray beam in an absorber/filter. The probabilities for theses processes to take place depend on the composition of the absorber, its thickness, its denisty and on the energy of the x-ray photons. The transmission factor of an absorber/matrix is defined as the ration between transmitted and incoming photons.

XRF check allows you to define two different absorber/filter systems. Both can consist of multiple layers and each layer is defined by its composition, its thickness and its density. The density will be estimated when leaving the input field empty. The composition is given by a text in the form [percentage-value1]%[element1 or compound1]+ [percentage-value2]%[element2 or compound2] … e.g. “70%Si02+25%CaO+x%Fe”. In this example the amount of iron will be set to 5% so the sum of all compounds is 100%. The short cut “air” will result in a layer with the composition of atmosphere on earth.

The energy dependency of the transmission factors of both absorbers will be displayed in the graph below. You can: switch between linear and logarithmic y-axis scaling, define the energy range to be displayed, export the data to a text-file, pan and zoom the graph with the left mouse button and the wheel or with common touch screen gestures.