Measurements of radiation levels inside the ESRF storage ring

Radiation damage observed on a number of cables in the storage ring has triggered a series of radiation measurements inside the storage ring to assess dose levels during injection and during stored beam conditions. Photon dose rates have been measured in different locations, using small ionization chambers. The results show a strong spatial variation of the measured dose rates and indicate that the radiation damage is essentially due to synchrotron radiation. The measured dose levels allow us to make estimations of the integrated dose in certain areas of the storage ring over the lifetime of the ESRF. The paper also describes a beam loss monitoring system, using 32 ionization chambers installed inside the storage ring, allowing the quantifying of beam losses.