A. Fasso et al., RADIATION-LEVELS IN LEP, 1989-1995, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 384(2-3), 1997, pp. 531-538
This paper discusses the radiation levels monitored in and around the
LEP tunnel and the underground experimental areas and in the environme
nt on the surface, following the first six years of operation where th
e 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 equiv
alent are not discernable from the background.