CAP88-PC
CAP88-PC (Clean Air Act Assessment Package - 1988) is a computer code for estimating the dose and riskThe probability of injury, disease or death from exposure to a hazard. Radiation risk may refer to all excess cancers caused by radiation exposure (incidence risk) or only excess fatal cancers (mortality risk). Risk may be expressed as a percent, a fraction, or a decimal value. For example, a 1% excess risk of cancer incidence is the same as a 1 in a hundred (1/100) risk or a risk of 0.01. from emissions of radioactive material to the air. CAP88-PC is a regulatory compliance tool under the National Emissions Standard for Hazardous Air Pollutants (NESHAPs).
Version 4.1.1 is now available. The beta version of the STARGET utility continues to be available. The final version of STARTGET will be available shortly.
Earlier versions of CAP88-PC are available in the EPA Archives. Search EPA Archive
On this page:
Version 4.1.1
Version 4.1.1 is the most recent version of the code and may be used to demonstrate compliance with NESHAPs Subpart H.
CAP88-PC Version 4.1.1 is a minor update to the previous operating version of CAP88-PC. This version–
- Allows users to access data stored on network remote locations as is commonly done at federal facilities.
- Corrects a minor error for some radionuclides resulting from default particle size establishments.
- Corrects an error when tellurium-129m is encountered in either the radionuclide released from the facility or in the decay chain.
- Corrects an error in Version 4.0 that provided incorrect dose coefficients for iridium-192m and iridium-192n.
Version 4.1.1 retains the major architectural, data handling, and user interface updates introduced in Versions 4.0 and 4.1, and no changes were made to the transport and dose models or to the reporting functions in CAP88-PC as part of the Version 4.1.1 update.
IMPORTANT NOTE TO USERS: Installing Version 4.1.1 on your computer will uninstall Version 4.0 and Version 4.1. If you wish to use Version 4.0 or Version 4.1 for the current compliance cycle, please wait to install Version 4.1.1 until you have submitted your reports. If you have previously installed the beta version of Version 4.1, please uninstall it before downloading CAP88-PC Version 4.1.1. To uninstall, open “Control Panel," click on “Programs and Features,” highlight the CAP88-PC Version 4.1 beta program, then right-click and select “uninstall.”
Download CAP88-PC Version 4.1.1 and supporting documents.
CAP88-PC Version 4.1.1 is compatible with Windows 10. Version 4.1.1 has a full set of dose conversion factors from DCFPAK 3.02. In Version 4.1.1, report files can be opened in text editors, such as NotePad, or in word-processing programs, such as Microsoft Word, to facilitate printing.
Version 4.1.1 System Requirements
- Windows 10 or later.
- NET Framework version 4.
- 32-bit x86 architecture. 64-bit installation not supported but the 32-bit version can be installed on 64-bit systems.
STARGET Utility
A beta version of the STARGET Utility is available to convert meteorological data in STAR format to a *.wnd file for use in CAP88-PC.
Download STARGET Utility and supporting documents.
Version 4.0
Version 4.0, the previous version of the code, may still be used to demonstrate compliance with NESHAPs Subpart H. CAP88-PC Version 4.0 has age-dependent radionuclide dose and risk factors for ingestion and inhalation.
Download CAP88-PC Version 4.0.1.17 (ZIP) (37 MB, September 2014) (includes User Manual and other supporting documentation).
CAP88-PC Version 4 Testing Report: Revision 1 (pdf)
Modeling Capabilities
Plume Modeling
CAP88-PC uses a modified Gaussian plume model to estimate the average dispersion of radionuclides released from up to six sources. The sources may be either elevated stacks, such as a smokestack, or uniform area sources, such as a pile of uranium mill tailingsThe remaining portion of a metal-bearing ore after some or all of a metal, such as uranium, has been extracted.. While up to six stacks or area sources can be modeled, all the sources are modeled as if located at the same point; that is, stacks cannot be located in different areas of a facility. Uniform contamination is assumed for area sources.
Plume rise can be calculated assuming either a momentum or buoyancy-driven plume. The same plume rise mechanism (buoyant or momentum) is used for each source. Assessments are done for a circular grid of 16 sectors by setting distance and direction within a radius of 80 kilometers (50 miles) around the facility. Errors arising from these assumptions will have a negligible effect for assessments where the distance to exposed individuals is large compared to the stack height, area or facility size.
Radionuclide Concentration Modeling
The program computes radionuclide concentrations in air, rates of deposition on ground surfaces and plants, and concentrations in food. It uses intake rates to people from ingestion of food produced in the assessment area and inhalation of airborne radionuclides. Estimates of the radionuclide concentrations in produce, leafy vegetables, milk and meat consumed by humans are made by coupling the output of the atmospheric transport models with the terrestrial food chain models in the U.S. Nuclear Regulatory Commission, Regulatory Guide 1.109 (pdf)(3.03 M).
Variation in radionuclide concentrations due to complex terrain cannot be modeled; all assessments assume a flat plain.
Risk Estimate Modeling
Dose and risk estimates from CAP88-PC are applicable only to low-level chronic exposures, because the health effects and dosimetric data are based on low-level chronic intakes. CAP88-PC should not be used for either short-term or high-level radionuclide intakes.
CAP88-PC provides methodologies for assessments of both collective populations and maximally-exposed individuals and allows users to edit some environmental transport variables. A complete set of dose and risk factors, census data, and stability array data used in CAP88-PC is provided; however, site-specific data can be entered by the user.