Since 1976, the IAEA has maintained a register of dosimetry laboratories in the IAEA/WHO SSDL Network. The Network includes SSDLs either as full or as provisional members. PSDLs and international organizations are included as affiliated members. Full members are requested to submit their annual report to the IAEA. Up-to-date information about calibration services provided around the world based on these annual reports can be found in DOLNET.