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NESC9460 MILDOS-AREA.

MILDOS-AREA, Radiological Impact of Airborne U238 from Mining and Milling

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1. NAME OR DESIGNATION OF PROGRAM:  MILDOS-AREA.
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2. COMPUTERS
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Program name Package id Status Status date
MILDOS-AREA NESC9460/01 Tested 16-OCT-1991

Machines used:

Package ID Orig. computer Test computer
NESC9460/01 IBM PC DEC VAX 8810
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3. DESCRIPTION OF PROGRAM OR FUNCTION

MILDOS-AREA estimates the radiological impacts of airborne emissions from uranium mining and milling facilities or any other large-area source involving emissions of radioisotopes of the uranium-238 series.
Wind frequency data are provided by the user. The transport model includes the mechanisms of dry deposition of particulates, resuspension, radioactive decay and progeny ingrowth, and plume reflection. Deposition buildup and ingrowth of radioactive progeny are considered in estimating surface concentrations, which are modified by radioactive transformation, weathering, and other environmental processes. MILDOS-AREA allows the user to vary the emission rates of the sources as a step-function of time. Impacts to humans through such pathways as inhalation, external exposure, and ingestion are estimated based on calculated annual average air concentrations of nuclides. Individual, total individual, annual population, and environmental dose commitments are calculated with conversion factors derived from recommendations of the International Commission on Radiological Protection (ICRP) and Oak Ridge National  Laboratory. Age-specific dose factors are calculated.
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4. METHOD OF SOLUTION

A sector-averaged Gaussian plume-dispersion model is used to compute concentrations of radioactive materials from fixed-point sources. Area sources are calculated either with the original MILDOS virtual-point method or a finite-element integration method. A choice of vertical-dispersion coefficients is  available; the Briggs dispersion coefficients are most appropriate for a tall source, such as a uranium mill plant stack, while the Martin-Tickvart coefficients provide a more realistic representation for near-ground level sources, such as a mill tailings pond.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   300 nodes
    48 individual receptors
    10 sources (point or area)
    10 time steps
The current version is applicable only to uranium-238 series nuclides.
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6. TYPICAL RUNNING TIME:  2 to 10 minutes are required on an IBM PS/2 Model 80.
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7. UNUSUAL FEATURES OF THE PROGRAM

A validation study of MILDOS-AREA  was conducted using measured Rn-222 concentration and flux data from the Monticello, Utah uranium mill tailings impoundment. The results  of this study demonstrated that use of MILDOS-AREA can result in generally good agreement between model-generated and measured Rn-222 concentrations.
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8. RELATED AND AUXILIARY PROGRAMS

MILDOS-AREA is a revision of the MILDOS code, incorporating enhanced capabilities for handling large  area source dispersion and updated dosimetry calculations. MILDOS, which was designed to compute environmental radiation doses from uranium recovery operations, is an adaptation of the UDAD (NESC 824) uranium dispersion and dosimetry code.
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9. STATUS
Package ID Status date Status
NESC9460/01 16-OCT-1991 Tested at NEADB
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10. REFERENCES:
NESC9460/01, included references:
- Y.C. Yuan, J.H.C. Wang, and A. Zielen:
  MILDOS-AREA - An Enhanced Version of MILDOS for Large-Area Sources
  ANL/ES-161 (June 1989).
- D.L. Strenge and T.J. Bander:
  MILDOS - A Computer Program for Calculating Environmental
  Radiation Doses from Uranium Recovery Operations
  NUREG/CR-2011 (PNL-3767) (April 1981).
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11. MACHINE REQUIREMENTS

An IBM PC or compatible computer with 500 Kbytes of memory, math coprocessor, and a hard disk. A printer capable of producing 132-column output is needed.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC9460/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  MS-DOS 3.1.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

          Y.C. Yuan
          Energy and Environmental Systems Division
          Argonne National Laboratory
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16. MATERIAL AVAILABLE
NESC9460/01
File name File description Records
NESC9460_01.001 Information file 101
NESC9460_01.002 file to compile MILDOS on VAX 2
NESC9460_01.003 file to run MILDOS on VAX 6
NESC9460_01.004 source program, include file 7
NESC9460_01.005 source program, include file 2
NESC9460_01.006 source program, include file 3
NESC9460_01.007 source program, include file 4
NESC9460_01.008 source program, include file 4
NESC9460_01.009 source program, include file 4
NESC9460_01.010 source program, include file 2
NESC9460_01.011 source program, include file 1
NESC9460_01.012 source program, include file 3
NESC9460_01.013 source program, include file 2
NESC9460_01.014 source program, include file 1
NESC9460_01.015 source program, include file 2
NESC9460_01.016 control information file 79
NESC9460_01.017 Namelist sample problem 1 126
NESC9460_01.018 Namelist sample problem 2 135
NESC9460_01.019 Namelist sample problem 3 140
NESC9460_01.020 Source to return system date 7
NESC9460_01.021 Source to stop execution 3
NESC9460_01.022 Source to return command line 6
NESC9460_01.023 Source to return count of 0.01 sec ticks 7
NESC9460_01.024 Source to suppress arithmetic underflow err 4
NESC9460_01.025 Source to return last non blank char. string 11
NESC9460_01.026 Main source program 847
NESC9460_01.027 Subroutines source program 3078
NESC9460_01.028 Output sample problem 1 2726
NESC9460_01.029 Executable for viewing an ASCII file 0
NESC9460_01.030 MILDOS executable program 0
NESC9460_01.031 Batch file that executes MILDOS on PC 15
NESC9460_01.032 DOS file-names 31
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • R. Environmental and Earth Sciences

Keywords: dispersions, dose rates, radiation doses, radionuclide migration, uranium 238.