external exposure facility NDS The Laboratory for Dosimetry Standards (NDS) at the Jozef Stefan Institute, established in 1992 and appointed Designated Institute by Slovenia's Metrology Institute (MIRS) in 2008, holds the Slovenian national standard for ionising radiation (air kerma and dose equivalent). It provides gamma (Co-60, Cs-137, Am-241), X-ray (2–160 keV, various ISO 4037 and IEC 61267 qualities) and mammographic spectrum irradiations, with dose rates from 0 to 0.1 Gy/min, and is accredited to ISO/IEC 17025. Calibration capabilities are confirmed through BIPM supplementary intercomparisons and are published in the BIPM KCDB database. Located at Jozef Stefan Institute. Paul Schofield website