Radiation levels in LEP, 1989–1995

This paper discusses the radiation levels monitored in and around the LEP tunnel and the underground experimental areas and in the environment on the surface, following the first six years of operation where the collider has mostly been working at 45 GeV (LEP phase I). At the end of 1995 the LEP II program was started, with an energy increase to 68 GeV. The radiation levels in the underground areas accessible during LEP operation are very low and on the surface the values of dose equivalent are not discernable from the background.