GENII
Pathways and Scenarios
Available release scenarios include chronic and acute releases to water or to air (ground level or elevated sources), and initial contamination of soil or surfaces. GENII implements the NRC models in LADTAP for surface water doses. GENII does not explicitly include modules for performing groundwater transport calculations, however the FRAMES system allows addition of other computer modules to the GENII system. Exposure pathways include direct exposure via water (swimming, boating, and fishing), soil (surface and buried sources), air (semi-infinite cloud and finite cloud geometries), inhalation and ingestion pathways. The tritium model also incorporates considerations of organically-bound tritium (OBT).
GENII Version 1 implemented dosimetry models recommended by the ICRP in Publications 26, 30, and 48, and approved for use by DOE Order 5400.5. GENII Version 2 implements these models plus those of ICRP Publications 56 through 72, and the related risk factors published in Federal Guidance Report 13. Risk factors in the form of EPA developed "slope factors" are also included (these are a special subset of the FGR-13 values). These dosimetry and risk models are considered to be "state of the art" by the international radiation protection community and have been adopted by most national and international organizations as their standard dosimetry methodology.