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While naturally-occurring cesium (133) is not considered dangerous, the radioactive isotope Cesium-137 is the most dangerous element found in the aftermath of nuclear accidents and nuclear war.

Cesium-137 persists in the environment for 200 - 300 years, making soils unusable for agriculture.

Foods that tend to absorb natural cesium also have high affinity for absorbing radioactive cesium isotopes.

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