RSICC Home Page RESRAD 6.5

RSICC CODE PACKAGE CCC-786

1.         NAME AND TITLE

RESRAD 6.5:  Code System to Implement Residual Radioactive Material Guidelines

AUXILIARY CODES

RESRAD-BUILD 3.5         Calculates doses to persons inside structures from radioactive materials on or in the walls, ceiling, or floors.

RESRAD-BIOTA 1.5        

RESRAD-RECYCLE 3.10 Calculates doses to workers and members of the general public from the recycle of materials containing traces of radioactive materials.

RESRAD-OFFSITE 2.6      Couples an atmospheric dispersion model and a groundwater transport model with RESRAD, thereby permitting calculation of doses to persons located beyond the boundary of the site.

2.         CONTRIBUTORS

Argonne National Laboratory, Argonne, Illinois.

3.         CODING LANGUAGE AND COMPUTER

Fortran 95 and BASIC; Xeon running Windows 7 & XP (C00786PCX8600).

4.         NATURE OF PROBLEM SOLVED

RESRAD is designed to calculate site-specific residual radioactive material guidelines, and radiation dose and excess cancer risk to an on-site resident (maximally exposed individual). A guideline is a radionuclide concentration or level of radioactivity that is acceptable if a site is to be used without radiological restrictions. Guidelines are expressed as concentrations of residual radionuclides in soil. Soil is unconsolidated earth material, including rubble and debris that may be present. The guidelines are based on the following principles: (1) the total effective dose equivalent should not exceed 100 mrem/yr for all plausible land uses and 30 mrem/yr for current and likely future land uses, and (2) doses should be kept as low as reasonably achievable (ALARA). Nine environmental pathways are considered: direct exposure, inhalation of dust and radon, and ingestion of plant foods, meat, milk, aquatic foods, soil, and water.

RESRAD-BUILD is a pathway analysis model designed to evaluate the potential radiological dose incurred by an individual who works or lives in a building contaminated with radioactive material. The radioactive material in the building structure can be released into the indoor air by mechanisms such as diffusion (radon gas), mechanical removal (decontamination activities), or erosion (removable surface contamination.)

Version 6 of RESRAD incorporates many improvements. These include the addition of seven new radionuclides: selenium-79, zirconium-93, neodymium-93m, barium-133, curium-245, curium-246, and curium-247. The code was also modified to account for radioactive decay and in growth during food storage times. The code now has an improved groundwater model to ensure convergence for Kd calculations when water concentrations are known; has an improved radon pathway to reduce execution time; allows sensitivity analyses of many more parameters, such as transfer factors, leach rate, and solubility; has a modified user interface to better check the sensitivity ranges; and contains many updates in its graphics. The code now allows users to input radionuclide activity in SI units, and the resultant doses can also be reported in SI units. QA files are now distributed along with the code so that users can ensure that the code is properly installed and verify RESRAD calculations on their computers. See the developer's web site for the latest information at http://www.ead.anl.gov/resrad.

5.         METHOD OF SOLUTION

RESRAD uses a pathway analysis method in which the relation between radionuclide concentrations in soil and the dose to a member of a critical population group is expressed as a pathway sum, which is the sum of products of “pathway factors.” Pathway factors correspond to pathway segments connecting compartments in the environment between which radionuclides can be transported or radiation transmitted.

6.         RESTRICTIONS OR LIMITATIONS

The groundwater pathway models apply only to situations for which the hydrological strata can reasonably be approximated by a sequence of uniform, horizontal strata.

7.         TYPICAL RUNNING TIME

Run times vary based on system, on the order of a few seconds.

8.         COMPUTER HARDWARE REQUIREMENTS

Windows based personal computers.

9.         COMPUTER SOFTWARE REQUIREMENTS

The new features of RESRAD for Windows include a graphical display of active pathways, a sensitivity summary bar, integrated plot options and results, color-coded default settings, an uncertainty summary window, button prompts to interpret icons, and soil strata graphic feedback. Furthermore, in order to take advantage of the latest computer technology, the RESRAD Fortran programs are now compiled by using the Fortran 95 (LAHEY/FUJITSU LF95) compiler. Also, the Windows interface, which was initially developed in 16-bit Visual Basic 4.0, is now upgraded to 32-bit Visual Basic 6.0. The software was tested under Windows 7 & XP.

10.       REFERENCES

a. Included in documentation:

C. Yu, et al., “User’s Manual for RESRAD Version 6,” ANL/EAD-4 (July 2001).

b. Background references:

C. Yu, et al., “Manual for Implementing Residual Radioactive Material Guidelines Using RESRAD, Version 5.0,” ANL/EAD/LD-2 (September 1993).

C. Yu, et al., “Data Collection Handbook to Support Modeling the Impacts of Radioactive Material in Soil,” ANL/EAIS-8 (April 1993).

C. Yu, et al., “RESRAD-BUILD: A Computer Model for Analyzing the Radiological Doses Resulting from the Remediation and Occupancy of Buildings Contaminated with Radioactive Material,” ANL/EAD/LD-3 (November 1994).

K. F. Eckerman, A. B. Wolbarst, and A. C. B. Richardson, “Limiting Values of Radionuclide Intake and Air Concentration and Dose Conversion Factors for Inhalation, Submersion, and Ingestion,” Federal Guidance Report No. 11, EPA-520/1-88-020 (September 1988).

K. F. Eckerman and J. C. Ryman, “External Exposure to Radionuclides in Air, Water, and Soil,” Federal Guidance Report No. 12, EPA 402-R-93-081 (September 1993).

11.       CONTENTS OF CODE PACKAGE

Included are the referenced documents, executables, data, and sample templates in a self-extracting executable on CD. Source files are not included in this release.

12.       DATE OF ABSTRACT

June 1990, July 1994, May 1995, August 1996, April 1997, June 1998, September 2011.

KEYWORDS:     ENVIRONMENTAL DOSE; GAMMA-RAY; INTERACTIVE; RADIONUCLIDES; RADIOACTIVITY RELEASE; RADIATION ENVIRONMENT