[en] RAC is a computer system designed to provide estimates of individual dose rates due to accidental releases of radioactivity to the atmosphere. RAC is based upon several simplifying assumptions. Atmospheric dispersion is approximated with a Gaussian plume model. The plume direction is limited to a straight line; that is, once a puff of radioactivity is released, it is considered to travel in a straight line at the entered windspeed ad infinitum. A linear model is used to calculate doses for external gamma radiation during plume passage, inhalation, and drinking cow milk for ground-level releases. RAC is intended to be a dose assessment tool for use during a radiation accident situation. RAC calculates dose due to three pathways, external exposure, inhalation, and cow milk ingestion, but the inhalation pathway is further subdivided into thyroid dose, total body dose, and lung dose. The code may be used to calculate dose rates for hypothetical situations formed by potential releases and meteorological considerations. This report provides a portion of the documentation of RAC. It provides an overview of the code, a discussion of each integral part of the code, a description of the data file contents and the source of those contents, and discussion of the interrelationships of the various parts of the code. 8 references, 12 figures