.. _materials: --------- Materials --------- Material is just a simple compoistion of nuclides with concentration will be changed over the time of the simulation process. To ensure right solution some attributes should be added to material like ``volume``[cm^3], ``power`` if materials is on induced radiation. The :ref:`main block ` constitutes with two arrayes one with name of nuclides and another with nuclear conctrations multiplied by 10^-24. To uncertainties analysis user can provide initial uncertainties for every nuclide in according array ````.