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Risk Assessment
Risk Assessment and Federal Guidance Programs:  

Radiation Risk Assessment Software: CAP-88 and CAP-88 PC


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You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.

Version (9/2014)

CAP88 Version (9/2014) (ZIP) (35MB) CAP88 V4 Beta Testing Report (PDF) (405 pp, 2.14MB)

CAP88 Version has been approved for determinations of regulatory compliance see, FR NOTICE. We encourage users to use this most recent, updated code.

CAP88-PC Version 4.0 has only been tested on Windows XP with Service Pack 3, Windows Vista, Windows 7, Windows 8, and Windows Server 2008, 2008 R2, and 2012. Windows versions before XP with SP3 are not supported. Also, CAP88-PC V4 requires the .NET Framework 4 to be installed on your machine; if you do not have the .Net Framework Version 4 already installed you may Download it here.

Please read the README.txt file contained in the download zip archive for important information about this release prior to installing CAP88-PC Version 4.

The User's Manual for CAP88-PC Version 4 is provided both on-line as context-sensitive help and in the installation file set. The location of the User's Manual is described in the README.txt file.

This installation package has been digitally signed. However, you may still receive a Windows Smartscreen alert when you launch installation because this file will have been downloaded from an Internet location. This warning may be safely ignored in this case.

CAP 88 v4 has undergone an internal EPA quality assurance review.  The quality assurance review report and documentation are available at the Office of Radiation and Indoor Air (ORIA). 

Version 3.0 - Release with Federal Guidance 13 Data and Full Buildup Factor Generation (2/9/13)

CAP88 Version 3 (2/09/13) (ZIP)(25.7MB)

Supplemental Information

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Version 2.1

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Version 2.0

CAP88-PC version 2.0 is a Windows version of CAP88-PC. Version 2.0 includes some minor changes compared to the DOS version. These changes include:

EPA has approved use of CAP88-PC version 2.0 for demonstrating compliance with 40 CFR 61.93 (a) NESHAPs subpart H-emissions of Radionuclides Other than Radon from Department of Energy Facilities.

Special Installation Instructions for Version 2.0

CAP88-PC v2.0 will NOT run under Windows XP or Windows NT. It will run under Windows95 - Windows2000 if installed following special instructions that compensate for the more limited file recognition capabilities of Windows 3.1 used to develop CAP88-PC v2.0. Windows95-2000 will automatically install it in the directory "c:\Program files\," which has more than the eight characters CAP88-PC v2.0 can recognize.

To install the program correctly, follow these instructions:

  1. click on the C2.EXE file to download, and save it to your c:\ drive.
  2. Open Windows Explorer, and double click on the C2.EXE file. The "Welcome" dialogue box will appear and
    ask if you want to install the program.
  3. Click "OK."
  4. When the "Select Destination Directory" dialog box appears, change the path:
    from: c:\Program Files\CAP88PC2
    to: c:\CAP88PC2
  5. Click "OK."
  6. Follow the directions in the succeeding dialogue boxes to complete installation of the program.

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Version 1.0

CAP88-PC version 1.0 is a personal computer software system used for calculating dose and risk from annual average releases of radionuclides to the air. CAP88-PC version 1.0 is a DOS based software and is approved for demonstrating compliance with 40 CFR 61.93 (a).

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CAP88 Mainframe

Further information on models may be obtained by accessing Risk Assessment

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Hardware Requirements

The following is a description of the computer hardware which will be required to use this software.

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