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Model Report


Last Revision Date: 10/01/2009 View as PDF
General Information Back to Top
Model Abbreviated Name:

Model Extended Name:

Model Overview/Abstract:

The IONEX program's name is a contraction of "ion exchange." The IONEX program performs calculations related to removing radium and/or uranium from water with the ion exchange process. IONEX provides a quick method of calculating whether a proposed ion exchange process will meet your requirements in terms of the following:

  • Producing a finished water of sufficient quality to meet drinking water MCLs for radium or uranium
  • Producing a waste product that can be disposed of in a manner consistent with EPA guidelines
  • Operating without producing an unacceptable radiation health risk to treatment personnel or property owners
  • This program calculates radionuclide concentrations and gamma radiation doses with sufficient accuracy for its intended purpose of Design Estimate Calculation. The IONEX program was originally written for the "Guidelines" published in July, 1990. IONEX version 2.1 is a revision of the program that reflects the "Guidelines" as of June, 1994.

    Model Technical Contact Information:

    Stan Rydell, Ph.D.
    U.S. EPA, Region 1
    Telephone: (617)-918-1637

    The model was developed and is maintained by Stan Rydell.

    User Information Back to Top
    Technical Requirements
    Computer Hardware
    Pentium II or better.
    Memory requirements are problem-dependent. RAM of 64 MB or more and ROM of 1 GB or more are preferred.
    Other Software Required to Run the Model
    Quick Basic 4.5
    Download Information
    The model is publicly available from U.S. EPA, Region 1.
    User Support
    User Qualifications
    User needs high level of technical education and/or modeling experience. This program is for engineers and water treatment people experienced with ion exchange. Not suited for use by the general public.

    Model Science Back to Top
    Problem Identification
    Simulates formation and fate/transport of daughter products of primary pollutants.

    The model uses mixed U.S. and S.I. units.

    Governing equations are solved numerically.

    Model Evaluation

    Code verification was performed by U. S. Region 1.

    The model was internally peer reviewed by U. S. Region 1.

    The model was externally peer reviewed by experts outside of U. S. EPA Region 1.

    QA/QC activities included software Beta testing.

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