COUNTERMEASURES AGAINST THE EFFECTS OF RADIOACTIVE CONTAMINATION.
It is particularly important to reduce the effects of contamination on land used to produce food. The following methods are particularly useful:
-in undisturbed soil, 98% of all radioactivity remains in the top 5cm of soil, even after 4 years.
- this is particularly effective for reducing
the effects of caesium contamination.
-this dilutes the 90Sr with calcium ions, and
hence reduces the amount of 90Sr
transferred to plants.
- if the addition of lime is followed by an addition of
potassium salts, the rate of uptake of 137Cs
is greatly reduced.
-potassium effectively reduces caesium contamination.
-phosphates bind Strontium and other highly charged
-high yield grasses preferentially take up the most
accessible minerals from the soil. They therefore absorb potassium more than
caesium and have a lower level of radioactivity.
-for example, grow oats on light soils, and
rye on clay soils to minimise 137Cs uptake.
-for example, butter contains <10% of the
radioactivity present in milk.
-minimise the use of contaminated feed.
-add absorbent mineral silicates to cattle feed to reduce
the uptake of radioactivity.