事實查核

VERDICT: true
Confidence: 99%

Evidence FOR:

• Bananas contain potassium, including a tiny proportion of the naturally radioactive isotope potassium-40.
• The U.S. EPA estimates that eating one banana delivers about 0.1 microsievert (0.01 millirem) of radiation.
• A typical banana has an activity of roughly 15 becquerels, meaning radioactive decays occur within it.
• Multiple scientific and educational sources explicitly confirm that bananas are slightly radioactive.

Evidence AGAINST:

• “Radioactive” can sound dangerously radioactive, but the amount is extremely small and does not pose a meaningful health risk.
• Potassium is regulated by the body, so potassium-40 from bananas does not simply accumulate with continued consumption.
• The “banana equivalent dose” is only an informal educational comparison and can oversimplify actual radiation exposure.

Cited source names:

• U.S. Environmental Protection Agency (EPA)
• McGill University Office for Science and Society
• Encyclopaedia Britannica
• Mirion Technologies
• BBC Science Focus Magazine
• Wikipedia (“Banana equivalent dose”)