Taurus - The New Internal Dosimetry Software

Taurus is the new internal dosimetry software developed by UKHSA's Chemical, Radiation and Environmental Hazards. It implements the most recent recommendations of the International Commission on Radiological Protection (ICRP Publication 103) and all the biokinetic and dosimetric models used for the calculation of the effective dose coefficients in the "Occupational Intakes of Radionuclides (OIR)" series of ICRP Publications. Users can use ICRP default parameter values or specify the parameter values for prospective and retrospective internal dosimetry calculations.

May 28, 2024: Taurus Advanced has been released!

Taurus is now available in two versions:

  • Taurus Base is the entry level and provides the core functionality of Taurus
  • Taurus Advanced includes more advanced functionality, to meet the needs of internal dose specialists and researchers

IMBA®; Integrated Modules for Bioassay Analysis

IMBA® (Integrated Modules for Bioassay Analysis) suite of software modules for internal dosimetry implements all of the biokinetic and dosimetric models recommended by the International Commission on Radiological Protection (ICRP). Users can specify their own parameter values and apply sophisticated data handling techniques to their customised internal dose calculations.

IMBA - New distribution arrangements

From 1 March 2022, under licence from UKHSA, the US Nuclear Regulatory Commission is taking over the distribution of IMBA worldwide (excluding Europe) through their RAMP programme. Please contact the new distributor at

Radiation Protection Computer Code Analysis and Maintenance Program (RAMP)

To enquire about support for existing IMBA customers and for information on European sales please contact the UKHSA IMBA team at imba@phe.gov.uk or use the 'Contact us' button on this site.