http://www.hemp.net/news/9901/06/hemp_eats_chernobyl_waste.html

in short, taken from the site.

PHYTOTECH (see webpage: www.phytotech.com/index.html ) specializes in phytoremediation, the general term for using phyto (plants) to remediate (clean up) polluted sites. Phytoremediation can be used to remove radioactive elements from soil and water at former weapons producing facilaties. It can also be used to clean up metals, pesticides, solvents, explosives, crude oil, polyaromatic hydrocarbons, and toxins leaching from landfills.

Plants break down or degrade organic pollutants and stabilize metal contaminants by acting as filters or traps. PHYTOTECH is conducting feild trials to improve the phytoextraction of lead, uranium, cesium-137, and strontium-90 from soils and also from water.

Phytoremediation with industrial hemp could be used at many of these sites. Unfortunantly, the U.S. government refuses to legalize the cultivation of industrial hemp and clings to the obsolete myth that it is a drug.