Chernobyl 40 years on, and countering ash dieback disease

This episode of The Naked Scientist explores two major scientific developments: the 40th anniversary of the Chernobyl nuclear disaster and breakthroughs in combating ash dieback disease. Chris Smith speaks with Malcolm Grimston from Imperial College London about the causes and consequences of the 1986 Chernobyl explosion, highlighting how flawed reactor design, systemic pressure within the Soviet system, and poor safety culture led to the catastrophe. The discussion covers the immediate aftermath, global fallout—particularly radioactive iodine and cesium—and the long-term health and societal impacts, including the psychological toll of forced evacuations. The episode also reflects on how public perception of nuclear energy has evolved, with countries like Germany reconsidering their nuclear phase-outs. Later, the focus shifts to sports-related brain health, featuring former rugby player Alex Popham, who developed early-onset dementia after repeated head trauma. Researchers in Ireland, led by Colin Doherty, link chronic brain damage in athletes to a 'leaky blood-brain barrier' caused by sub-concussive blows, advocating for rule changes to reduce exposure. Finally, Elizabeth Orton from the John Innes Centre reveals a revolutionary method to accelerate ash tree seed germination from years to weeks by extracting and culturing embryos, offering hope for breeding disease-resistant trees to combat the devastating ash dieback epidemic. The episode underscores the importance of learning from past disasters while innovating for ecological and human resilience.