User's Manual for RESRAD-OFFSITE Code Version 4 – Methodology and Models Used in RESRAD-OFFSITE Code (NUREG/CR-7268, ANL/EVS/TM-19/2, Volume 1)

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Publication Information

Manusript Completed: May 2019
Date Published: March 2021

Prepared by:
ANL Team: C. Yu, RESRAD Project Manager
E. Gnanapragasam, J.-J. Cheng, D. LePoire,
S. Kamboj, and C. Wang

Argonne National Laboratory
9700 S. Cass Avenue
Lemont, IL 60439

NRC Team: S. Bush-Goddard, NRC Project Manager
C. Barr and B. Abu-Eid


Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington DC 20555-0001

Availability Notice


The RESRAD-OFFSITE computer code evaluates radiological dose and excess cancer risk to an individual who is exposed while within and/or outside the area of initial (primary) contamination. The code considers releases from the primary contamination to the atmosphere, to surface runoff and to groundwater. It models the movement of the radionuclides, by groundwater and by air, from the primary contamination to the agricultural areas, pastures, a dwelling area, a well and a surface water body. It also simulates the accumulation of contaminants at those locations, where appropriate. Nine exposure pathways are considered in RESRAD-OFFSITE: direct exposure from contamination in soil, inhalation of particulates, inhalation of short-lived radon progeny, ingestion of plant food, meat, milk, aquatic foods, water and soil.

This document describes the processes modeled by the code; the data sources used in the modeling and the mathematical formulations of the processes are detailed in the Appendices. The sensitivity analysis feature and the probabilistic analysis feature are described. The options to model onsite exposure scenarios, to simulate the RESRAD-ONSITE code and the feature to compute area factors for regions of elevated contamination for offsite exposure scenarios are illustrated in the appendices. The benchmarking, verification and validation of the models in RESRAD-OFFSITE are described in this document.

Page Last Reviewed/Updated Thursday, June 24, 2021