Abstract. At future High-Luminosity LHC (HL LHC) at CERN the particle detectors of CMS, ATLAS, LHCb and Alice experiments will be exposed to severe background radiation conditions. A new gamma irradiation facility, called GIF++, was recently installed at CERN for investigation of the aging of all these detectors, when operating in such an environment. This paper presents a reference measurement system for control of the absorbed dose during the gamma irradiation of sub-detectors at GIF++ and their test results. It uses two types of RadFET detectors for absorbed dose measuring — LAAS 1600 for doses up to 10 Gy and REM 250 for larger doses — up to 10 kGy. The system employs a modular design, with each module being capable of reading out four sensors. The data can be downloaded using the available interfaces as RS-485 provided for a monitoring PC and CANBUS — for integration with the CERN control system. The further development of the system foresees its expanding by a set of dose-rate measuring units to control the distribution of the radiation field intensity around the radioactive source.

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