The World, the Universe and Us Chernobyl 40 Years On: Legacy of the World’s Worst Nuclear Disaster
Apr 23, 2026
Matt Sparkes, New Scientist reporter who visited the exclusion zone and met returning families. Jim Smith, environmental scientist who has studied Chernobyl for decades. They discuss wartime occupation and current military presence. They explain how the reactor exploded and contamination spread. They cover decommissioning, rewilding and unusual projects like distilled spirits from local apples.
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Safety Test Caused Reactor Runaway
- The Chernobyl explosion occurred during a safety test that destabilized the reactor at low power.
- Jim Smith explains poor reactor design, secrecy, and hierarchical pressure combined to trigger the catastrophic runaway event.
Different Isotopes Drive Different Risks
- Chernobyl released volatile fission products like iodine and longer-lived ones like cesium and plutonium into the environment.
- Iodine decayed within weeks but caused early health risks; cesium contaminated soils and upland UK sheep for years.
Why Radiation Provokes Deep Fear
- Radiation fear is amplified because it's invisible, technological, linked to cancer and to nuclear bombs.
- Jim Smith links cultural memory of Hiroshima/Nagasaki and unknowability to persistent public dread.
