PRISM allows probabilistic simulations to be carried out of the distribution and transport of contaminants in agricultural systems following routine and accidental releases of radionuclides to the atmosphere.  The code models the deposition, interception and inhalation of 42 elements and 129 associated radionuclides and their subsequent behaviour in agricultural systems.  A broad range of complex source terms and agricultural scenarios can be represented.   The models and data are fully documented in FSA reports.

The latest version, PRISM 3.3, fully updates the supporting information, consistent with recent international recommendations.  The performance of the soil-plant uptake model has been compared against data from a 17-year programme of soil column and lysimeter experiments undertaken by Imperial College. The comparisons demonstrated that the PRISM results are broadly consistent with the observed behaviour of the radionuclides studied, although further consideration is warranted relating to the kinetics of caesium sorption at early times following deposition.

Quintessa continues to provide support for PRISM, including review the representation of deposition and interception.