How to define an uniform source.

Hello, I want to define a box source with energy set as a range. Say any range like (0-0.5eV), (0.5-10eV), (10-5531eV), (10-10000000eV). How do OpenMC handles such source? Any example of it will be much helpful. Thanks.

See answer to previous question here: https://groups.google.com/d/msg/openmc-users/Du3kQrsCirg/wzoPJw7dAwAJ