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Researchers model movement of radioactive materials in soil

Date:
April 26, 2010
Source:
USDA/Agricultural Research Service
Summary:
Agricultural scientists are helping US Nuclear Regulatory Commission experts model the movement of radioactive materials in the soil. Their findings can be used to fine-tune the risk assessment studies that are an essential component in the development of commercial nuclear facilities.

ARS scientists are working with the U.S. Nuclear Regulatory Commission to use "tracers" for modeling the movement of contaminants in unsaturated soils and in groundwater.
Credit: Image courtesy of USDA/Agricultural Research Service

Agricultural Research Service (ARS) scientists are helping U.S. Nuclear Regulatory Commission (NRC) experts model the movement of radioactive materials in the soil. Their findings can be used to fine-tune the risk assessment studies that are an essential component in the development of commercial nuclear facilities.

Soil scientists Yakov Pachepsky, Timothy Gish and Andrey Guber all work in the ARS Animal and Natural Resources Institute in Beltsville, Md. The team set up their study at the Optimizing Production Inputs for Economic and Environmental Enhancement (OPE3) study area in Beltsville, which was established in 1998 to study major environmental and economic issues facing U.S. agriculture. It is equipped with remote sensing gear and other instrumentation for monitoring weather, soil, plants and groundwater.

The researchers studied how contaminants move through the vadose zone, which is the area between the soil surface and the groundwater zone. Over a 2-year period, the team added several nontoxic chemical tracers to irrigation water and used 12 site wells to monitor levels of those tracers at three different depths in the soil. Surface runoff, soil moisture profiles, soil water potential, groundwater levels and weather variables were also monitored.

The researchers compared the field data they collected on water flow and tracer concentrations with results from model simulations. Then they ran a range of chemical transport models that varied in complexity to learn more about conditions that could significantly affect the movement of water -- and contaminants -- below the soil surface.

Among other findings, the team concludedthat tracer transport in soils and shallow groundwater could be strongly affected by gaps in the vadose zone's restrictive fine-material layers.

This and other findings from this work can be used to estimate pollutant transport scenarios for risk assessment studies of nuclear facilities. The results were published in a report by the NRC in 2009.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. The original article was written by Ann Perry. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Researchers model movement of radioactive materials in soil." ScienceDaily. ScienceDaily, 26 April 2010. <www.sciencedaily.com/releases/2010/04/100423113737.htm>.
USDA/Agricultural Research Service. (2010, April 26). Researchers model movement of radioactive materials in soil. ScienceDaily. Retrieved September 3, 2014 from www.sciencedaily.com/releases/2010/04/100423113737.htm
USDA/Agricultural Research Service. "Researchers model movement of radioactive materials in soil." ScienceDaily. www.sciencedaily.com/releases/2010/04/100423113737.htm (accessed September 3, 2014).

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