An on line radiation monitoring system for the LHC machine and experimental caverns

With an unprecedented amount of electronic systems exposed to radiation, reduced operational efficiency due to radiation induced failures in electronic equipment has become a serious issue for the LHC. The RADMON radiation monitoring system presented here has been designed to measure radiation at the location of equipment and to provide an early warning as radiation levels start to increase. Nearly 300 monitors will provide on line measurements of the dose, dose rate, particle flux and particle fluence. The data can be visualised in real time in LHC control rooms and is stored in a database at a rate of 1 Hz. It will be shown that the system allows studying the spatio-temporal distribution of the radiation fields in the LHC.