Measured tritium oxide concentrations in air at various offsite locations are compared with concentrations predicted by three computer codes that are utilized at the Savannah River Site to estimate doses to maximally exposed offsite individuals. Annual average concentrations calculated by the computer models were compared with measured average concentrations taken from monitoring data collected over the last 10 y. The computer programs used for the comparison are AXAIRQ, MAXIGASP, and CAP88. The 10-y averaged ratios of predicted-to-measured tritium oxide air concentrations using AXAIRQ, MAXIGASP, and CAP88 are 1.89+/-0.56, 1.70+/-0.48, and 1.40+/-0.39, respectively. The difference in ratios is primarily due to different wind speed averages used within each of the models. These results show exceptional agreement, considering Gaussian plume models typically over predict annual average air concentrations by a factor of two to four.
AXAIR89Q has been improved to include many new features. The new verified version is AXAIRQ. The improvements include: deposition option, new diffusion coefficients, ability to calculate 95% dose at user selected distances, and user-input mixing height. Other improvements also have been made to the format of the output. The user has the option to select the new features or operate the code as AXAIR89Q.WESTINGHOUSE SAVANNAH RIVER COMPANY
SAVANNAH RIVER srm Westin house Savannah River Company Alken, ! k 29808-n-l l r 2 PREPARED FOR THE US. DEPARTMENT OF ENERGY UNDER CONTRACT NO. DE-AC09-89SR18035 4. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of themployees, makes any warranty, express or implied, or assumes any legal liability responsibility for the accuracy, completeness, or u any information, apparatus, product, or process disclosed, or represents that its use infringe privately owned rights. Reference herein to any specific commercial prod ss, or service by trade name, trademark, manufacturer, or otherwise does not necesszkily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not essarily state or reflect those of the United States Government or any agency thereof.
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