THE PTB CONTRIBUTION TO THE 1999 EURADOS INERCOMPARISON OF NATIONAL EARLY WARNING SYSTEMS

摘要

The PTB operates an underground laboratory for dosimetry and spectrometry (UDO). It is situated at the Asse salt mine near Braunschweig, at a depth of 925 m below ground. Due to the low air kerma rate of less than 0.7 nGy. H~-1 inside the laboratory, UDO is an excellent place for investigating the inherent background of radiation detectors and for providing 'back- ground free' calibrations of highly sensitive environmental monitoring systems. The UDO laboratory has been involved in several EC-sponsored intercomparisons of environmental dose rate meters, electronic dosemeters, thermoluminescence dosemeters (TLDs) And spectrometers.