Taurus is the primary internal dosimetry software developed by the Internal Dosimetry Tau Team in the UKHSA's Radiation, Chemical and Environmental Hazards Directorate. It incorporates one of the codes, Pleiades (Fell T.P. et al, 2007), used by ICRP for the calculation of the dose coefficients published in its 'Occupational Intakes of Radionuclides' (OIR) series of reports, and as such, uses ICRP Publication 107 radiation decay data, the specific absorbed fractions of ICRP Publication 133 and the biokinetic models and other parameters from the OIR series. Users can use ICRP default parameter values or specify the parameter values for prospective and retrospective internal dosimetry calculations.

Taurus will be available in two standard versions, Taurus Base and Taurus Advanced. The option to upgrade from Taurus Base to Taurus Advanced is available for Taurus Base users.

Taurus is a new piece of software to handle calculations with the most up-to-date methodology and is therefore not designed to replicate all the functionality of IMBA, the historical models, calculation methods, etc. Taurus is being developed to include advanced features, some that are, and some that are not available in IMBA.