The Radiation Safety and Security Division of the Paul Scherrer Institute (PSI) operates an accredited calibration lab for photon and neutron dosimeters and dose rate monitors as well as an approved dosimetry service for photon and neutron environmental and personal dosimeters. The reference neutron fields of the calibration lab are traceable to PTB in Germany and the irradiation conditions within the room have been studied by MCNPX simulation with and without the influence of the ISO water slab phantom. Passive dosimetry systems based on track etch methods are traditional at PSI. For highly sensitive area monitoring, a fission track detector within a moderator is used and for individual monitoring CR-39 detectors in various types of badges are in use. Readout of these detectors is performed by the older Autoscan instruments or by new types of TASL scanning systems. Optimization programs for etching conditions and readout procedures are ongoing. Besides internal use at PSI, the dosimetry group runs the individual neutron dosimetry service for CERN in Geneva and Desy in Hamburg and further external clients. In addition to the standard calibration based on reference radiation fields of a 241Am-Be neutron source the active and passive neutron dosimetry systems are also calibrated in realistic neutron radiation fields around accelerators.