The threshold for radiation poisoning in humans is measured in units of Gray (Gy). One sievert (Sv) is equal to one Gray of absorbed dose. The lethal dose of radiation for humans is estimated to be around 4-5 Sv (400-500 Gy) received over a short period of time. However, the amount of radiation emitted by bananas is so low that it is not considered harmful to humans. In fact, the average banana emits only about 0.1 microsieverts of radiation per hour. Therefore, it is highly unlikely that a person could consume enough bananas to reach a lethal dose of radiation.
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