The radiation environment found on the surface of the Moon is shown and applied to different possible lunar mission scenarios. Models for the primary particle environment to be found on the Moon due to galactic cosmic rays (GCR) and solar particle events (SPE) have been used, with solar modulation and surface backscattering patterns taken into account. The surface itself has been modeled as regolith and bedrock. Particle transport has been performed with both deterministic and Monte Carlo approaches. A good agreement is found between the two methods.