Concept for Internal Dosimetry and Approval of Internal Dosimetry Services in Switzerland

The new Swiss radiation protection regulations will require approval of the internal dosimetry laboratories. The procedures allow for two types of bioassay measurements: The 'screening measurements' for the local staff using relatively simple instrumentation to make sure that no unexpected intake has occurred and the 'incorporation measurements' by a dosimetry service approved for internal dose assessment. The use of standard biokinetic models and retention functions is recommended as long as dose limits are not exceeded and it is assumed that the intake took place in the middle of the monitoring interval. Nuclide-specific data sheets give detailed guidance on monitoring methods, intervals and dose calculation. Effective dose due to internal and external exposure of the radiation workers is recorded by the central dose registry.