No worries, you’ll stay healthy even if you consume 40 million bananas at once. — I love educational comparisons, especially in physics. Check this out: Bananas are radioactive! The banana equivalent dose, a measurement of a banana’s ionizing radiation, is 0.0000001 Sv (Sievert). The reason is that bananas contain naturally occurring radioactive isotopes of potassium, ⁴⁰K. …