The results of application of P-I-N and MOS dosimeters on PS-ACOL Irradiation Facility (PSAIF) in CERN for separate measurements of gamma dose and fast neutron fluences are presented. The mixed gamma-neutron field was due to 26 GeV protons hitting an irridium target, yielding an instantaneous dose rate of approximately 3.105 Gy/s. Good agreement with calibration curves for MOS on a 60Co gamma source as well as for P-I-N sensors on a neutron reactor spectrum with mean energy of 1 MeV and experimental results on PSAIF have been shown. Pulse current injection annealing of p-i-n diodes is considered. Such sensors are very convenient for on-line separated total dose measurements in mixed gamma-neutron radiation fields and could be installed near detector area of LHC as well as for radiation hardness testing of electronic components on irradiation facilities.