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• W21468907 abstract "RESRAD-BUILD is a pathway analysis model designed to evaluate the potential radiological dose to an individual who works or lives in a building contaminated with radioactive material. The transport of radioactive material inside the building from one compartment (or room) to another is calculated with an indoor air quality model. This paper discusses verification of the models which was performed by using Microsoft Excel spreadsheets and hand calculations. RESRAD-BUILD calculations verified included the source injection rate, air concentration in a compartment, air particulate deposition, exposure pathway doses, and time dependence in dose calculations. The direct external exposure pathway doses were also compared with Monte Carlo N-particle (MCNP) calculations. The agreement between the code output and spreadsheet calculations was excellent for all pathways. The paper also discusses limitations of the verification process and provides suggestions for future improvement of the RESRAD-BUILD code. Introduction RESRAD-BUILD code (Yu et al. 1994) has been developed by Argonne National Laboratory under sponsorship of the U.S. Department of Energy (DOE) to evaluate the potential radiological *Work supported by the U.S. Department of Energy, Office of Environmental Policy and Assistance and Office of Environmental Restoration, under Contract W-31-109-Eng-38. dose to an individual who works or lives in a building contaminated with radioactive material. It considers the releases of radionuclides into the indoor air by diffusion, mechanical removal, or erosion. The transport of radioactive material inside the building from one room or compartment to another is calculated with an indoor air quality model. The air quality model in RESRADBUILD evaluates the transport of radioactive dust particulates, tritium, and radon progeny due to (1) air exchange between rooms and with outdoor air, (2) the deposition and resuspension of particulates, and (3) radioactive decay and ingrowth. A single run of the RESRAD-BUILD code can model a building with up to 3 rooms or compartments, 10 distinct source locations, 4 source geometries (point, line, area, and volume), 10 receptor locations, and 8 shielding materials. A shielding object can be specified between each source-receptor pair for external gamma dose calculations. Seven exposure pathways are considered in RESRAD-BUILD: (1) external exposure directly from the source, (2) external exposure to materials deposited on the floor, (3) external exposure due to air submersion, (4) inhalation of airborne radioactive particulates, (5) inhalation of aerosol indoor radon progeny, (6) inadvertent ingestion of radioactive material directly from the sources, and (7) inadvertent ingestion of materials deposited on the surfaces of the building compartments. Fig. 1 conceptually illustrates the exposure pathways considered in RESRADBUILD. In the RESRAD-BUILD code, two direct exposure models based on source geometry are used. The first model for area and volume sources is based on a semi-infinite slab source with corrections for geometric factors (Kamboj et al. 1998). This exposure model uses the external dose conversion factors (DCFs) from Federal Guidance Report No. 12 (FGR-12) (Eckerman and Ryman 1993). The methodology described by Kamboj et al. (1998) for corrections due to finite size was extended to include differences due to the source material. The second model for point and line contamination is a simple dose integral method (Yu et al. 1994). RESRAD-BUILD Verification Procedure The results generated by the RESRAD-BUILD code (version 3.0) were compared with those obtained by using hand-held calculators and spreadsheets. The equations and reference data listed in the RESRAD-BUILD manual (Yu et al. 1994) for different pathways were used in the calculations. For verification purposes, different radionuclides  H, C, Na, Al, Cl, Mn, Co, Au, Ra, Ra, Th, and U  were chosen to effectively test all pathways and models. Tritium, Ra, and Th were chosen because of the special models used for tritium and radon in the RESRAD-BUILD code. Other radionuclides were selected to represent a spectrum of radiation types and energies. Verification of the RESRAD-BUILD code was conducted with an initial check of all the input parameters for correctness against their original source documents (Yu et al. 1994). Verification of the calculations was performed external to the RESRAD-BUILD code with Microsoft Excel (version 7) to verify all the major portions of the code. The verification was conducted on a stepby-step basis and used different test cases as templates, since all possible options could not be considered. The following types of calculations were investigated: (1) source injection rate, (2) ar concentration in the room, (3) air particulate deposition, (4) radon pathway model, (5) tritium model for volume source, (6) external exposure model, (7) different pathway doses, and (8) time" @default.
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• W21468907 date "2001-10-09" @default.
• W21468907 modified "2023-09-25" @default.
• W21468907 title "Verification of the RESRAD-BUILD computer code." @default.
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