Logo of the Physikalisch-Technische Bundesanstalt

Unit of Activity

Working Group 6.11


The main task of PTB´s “Unit of Activity” Working Group is the realization of the legal unit Becquerel (Bq) and its dissemination. The dissemination is either achieved by the provision of activity standards or by the calibration of radioactive sources which were sent to PTB. Research institutes, industrial companies as well as measurement laboratories for monitoring of radioactivity in the environment benefit from these services. The Working Group also focuses on radionuclides being used for therapy and/or diagnostics in medicine.

Since radionuclides have different decay characteristics, various measurement techniques are required and corresponding devices are available. The development and continuous improvement of measurement techniques as well as the experimental determination of decay data (e.g. half-lives) are subject of many research and development projects of the Working Group.

To top


  • Realization of the unit of activity Becquerel
  • Development and improvement of measurement methods for the activity determination of a number of radionuclides
  • Determination of decay data (e.g. half-lives) of frequently used radionuclides – often in collaboration with national and international partners
germanium-68/gallium-68 decay scheme

To top


vials and ampoules

To top


To top