last modified: 26-AUG-1982 | catalog | categories | new | search |

NESC0600 EGAD

EGAD, Ground Level Gamma Doses Function of Gamma Energy for Radioactive Releases

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1. NAME OR DESIGNATION OF PROGRAM:  EGAD
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2. COMPUTERS
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Program name Package id Status Status date
EGAD NESC0600/01 Tested 26-AUG-1982

Machines used:

Package ID Orig. computer Test computer
NESC0600/01 IBM 3033 IBM 3033
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3. DESCRIPTION OF PROBLEM OR FUNCTION

EGAD  calculates  gamma  dose
integrals to  a ground level  receptor, for incremental  values of
the vertical dispersion parameter sigma-z,  as a function of gamma
energy and spatial distribution of  the radioactive material.  The
dose integrals  are representative  of sector  averages since  the
distribution  of  material  is  assumed  to  be  Gaussian  in  the
vertical,  homogeneous  in  the horizontal,  and  bounded  between
ground level and an inversion  lid.  Calculated dose integrals are
independent  of radioactive  decay,  transport velocity,  downwind
distance, and  sector width.   Space attenuation  and buildup  are
taken into account.
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4. METHOD OF SOLUTION

The plume of radioactive  material is assumed
to  remain  constant in  shape  and  size  during passage  over  a
receptor  point.   The  space distribution  of  material  is  then
represented as parallel line sources.   The line contributions are
integrated  analytically by  transforming  to  Bessel and  related
functions, reducing the  spatial distribution to a  vertical plane
at the receptor  point.  Plane integrations are  then performed by
Gaussian quadratures.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME

Running  time  to   evaluate  integrals  is
typically less than 30 msec for each energy and receptor point.
NEA-DB executed the test case on IBM 3033 in 2 CP seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM

EGAD provides an efficient means
of  compiling tabular  data of  dose  integrals as  a function  of
incremental  values   of  energy   and  the   vertical  dispersion
parameter.   These data  may  then  be interpolated  for  specific
values of the  variables resulting in large  computational savings
if large amounts of meteorology data are to be processed.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC0600/01 26-AUG-1982 Tested at NEADB
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10. REFERENCE:
NESC0600/01, included references:
- R.E. Cooper:
  EGAD - A Computer Program to Compute Dose Integrals from External
  Gamma Emitters
  DP-1304 (September 1972)
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11. MACHINE REQUIREMENTS:  64K bytes of main storage on IBM 3033.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0600/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS370/033.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

                 R. E. Cooper
                 Savannah River Laboratory
                 E. I. duPont de Nemours and Company, Inc.
                 Aiken, South Carolina  29801
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16. MATERIAL AVAILABLE
NESC0600/01
File name File description Records
NESC0600_01.003 EGAD INFORMATION FILE 29
NESC0600_01.004 EGAD SOURCE PROGRAM (FORTRAN-4) 222
NESC0600_01.005 EGAD INPUT DATA FOR TEST CASE 6
NESC0600_01.006 EGAD OUTPUT OF TEST CASE 29
NESC0600_01.007 EGAD JCL FOR TEST CASE 11
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: dose rates, gamma radiation, radioactivity.