This cesium-137 continues to show up in food products throughout Europe every year, especially jams, mushrooms and wild boar (who eat the mushrooms). While we think of Chernobyl as a disaster that occurred in the past, it continues to present risk to people living far from the site who were not yet born. The triple meltdowns at Fukushima spread radioactive clouds throughout the region, with the primary deposition of fallout being to the northwest of the plants.
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There too, cesium-137 continues to spread through the ecosystem. As a chemical, cesium-137 is very adept at migrating in nature. It easily passes from air to soil to water to plants to biota. It remains radioactively dangerous for about 300 years, meaning that once it has deposited and embedded into an ecosystem, centuries of risk will follow.
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