.. algorithm:: .. summary:: .. relatedalgorithms:: .. properties:: Description ----------- Sets the neutrons information in the sample. You can either enter details about the chemical formula or atomic number, or you can provide specific values for the attenuation and scattering cross sections and the sample number density. If you provide a chemical formula or atomic number, the cross sections will be calculated from a database. If you decide to provide specific cross sections, they will override the tabulated ones. For details of how the various quantities are calculated, refer to the :ref:`Materials` concept page. .. note:: It is recommended that you use :ref:`SetSample ` instead. .. categories:: .. sourcelink::