The RESRAD-BIOTA code was designed to be consistent with, and provide a tool for, implementing the US DOE Graded Approach for Evaluating Radiation Doses to Aquatic and Terrestrial Biota (US DOE, 2002).
RESRAD-BIOTA is available free of charge and can be downloaded from the RESRAD Web site http://web.ead.anl.gov/resrad.