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CAP88-PC Version 4, an Updated Radionuclide NESHAPS Model

Wood, Raymond*; Stuenkel, David*; Rosnick, Reid

doi: 10.1097/HP.0b013e31828e1e10
Operational Topic

The latest version of the CAP88-PC computer model, Version 4, has many changes and improvements from previous versions. The most significant of these changes from a user perspective are the incorporation of age-dependent radionuclide dose and risk factors for ingestion and inhalation, the increase in the number of included radionuclides, and a change in the file management system used by the program. Other changes less visible to the user include new code architecture, incorporation of numerical solvers for the calculation of radioactive decay chains, including the ingrowth of decay products during air transport and ground surface deposition, enhanced error messages, updated on-line help, and a utility for migrating Version 3 datasets, wind files, and population files to Version 4. The modifications have produced a significant improvement in speed and stability for Version 4 relative to Version 3 and eliminated the solution approximations used in Version 3. The U.S. Environmental Protection Agency has implemented an extensive testing and documentation program for CAP88-PC Version 4 to address user concerns with past versions, resulting in enhanced documentation supporting compatibility with user software quality assurance programs.

The paper describes the version 4 update to the CAP88-PC model that provides significant improvements in performance, maintainability, and compatibility compared with earlier versions.

*Trinity Engineering Associates, Inc.; †Trinity Engineering Associates, Inc.; ‡U.S. Environmental Protection Agency Office of Radiation and Indoor Air.

The author declares no conflicts of interest.

© 2013 by the Health Physics Society