Artificial radionuclides
Contamination of soil with artificial radionuclides (cesium-137,
strontium-90 and some plutonium isotopes) has given rise to increased
public concern since the Chernobyl accident.
Radionuclides in the upper layers of soil may expose plants and
animals to radiation and, in extreme cases, present a threat to
humans in the form of direct ionising radiation.
Radionuclides can enter the food chain through the soil, leading
to intake by humans and animals through ingestion, while wind-blown
contaminated soil particles could lead to exposure through inhalation.
Soil 
Problems and threats to the soil 
