Is it true that bananas are radioactive?

Madiha sabir 10/26/2018. 8 answers, 15.933 views
food-safety bananas

Is it true that bananas are radioactive, and if you eat too many it can kill you? If yes then how many bananas are good to eat at once.

8 Answers

Mike Scott 10/29/2018.

When people compare the radiation received from other sources with the radiation from eating a banana, the point of the exercise is not to say that eating bananas is risky. It’s to say that the radiation level you’re exposed to from from things like nuclear power is safe, and you shouldn’t worry about it (or about eating bananas).

MikeTheLiar 11/01/2018.

bitten by a radioactive banana

Yes, it's true that bananas are radioactive, however, the amount of radiation that you get from eating a banana is negligible. It's also true that eating too many bananas can kill you, but if you manage to eat enough bananas to get radiation poisoning, you're going to die from something else long before potassium exposure comes into the equation - like, say, the death penalty after murdering the next person to bring a banana within 50 miles of you.

relevant xkcd


Bananas are on the left, third from the top. To better communicate the scale, the top legal (i.e. totally negligible) radiation dose for US workers is equivalent to eating 500,000 bananas/year.

There is actually a unit of radiation exposure measurement called the Banana equivalent dose. Suffice to say, there are about a thousand other sources of radiation in your day to day life that you should worry about before how many bananas you eat starts to become a real concern. You can safely eat as many bananas as you please, at least, from a radioactivity standpoint.

Allan Pinkerton 10/29/2018.

In addition to the answers explaining that bananas do contain radioactive potassium, but in small amounts, it's also worth noting that your body maintains a fixed amount of potassium through metabolism.

So even if you somehow manage to consume 5 million bananas, your body won't actually be exposed to 5 million Banana equivalent doses of radiation.

James Martin 10/29/2018.

While it's true that bananas are unusually radioactive (which actually means very slightly), you should keep in mind that all plants and animals are radioactive. For people, about half of our intrinsic radioactivity comes from the potassium in our bodies, and about half from the carbon-14 which we all carry around.

As for safe quantities, that's pretty simple: about 4 liters (9 pounds or so). But this has nothing to do with radioactivity - it's the approximate maximum capacity of the normal human stomach. Eating more than this runs the risk of tearing the stomach and dying.

The question of banana radioactivity has sparked the creation of the Banana Equivalent Dose of radiation. It's about 0.1 μSievert. Since it takes about 5 to 7 Sieverts to kill an adult human, the lethal dose (radiation) for bananas is something like 50 million bananas. And it's even harder to kill somebody that way than that rather silly number suggests. The body has a fairly comprehensive and efficient set of mechanisms for keeping things in balance, and excess potassium is typically excreted within 24 hours. Although, admittedly, the changes needed to support the ingestion of 50 million bananas would almost certainly cause other changes in the (formerly) human body, and any discussion of associated effects become pure speculation.

Stephie 10/26/2018.

Yes, bananas are radioactive. They contain potassium, and a small part of this comes as a radioactive isotope 40K. The dose of an average banana is (rounded up) around 0.1 μSv. Other potassium-rich foods also naturally contain 40K, e.g. potatoes.

There is absolutely nothing to worry about. Our natural environment and cosmic radiation means our bodies are constantly exposed to radioactive material, but just in trace amounts.

Loren Pechtel 10/28/2018.

If you were to somehow actually take all that radioactivity into your body you would be dead long before the radioactivity became an issue. The radioactive element is potassium--and potassium chloride is used as an execution drug.

In practice your body maintains potassium levels at the right amount (too little is also deadly), eating more bananas simply means more potassium in your urine.

Besides, I have a jar sitting here next to me. It's far more radioactive than a banana. It's meant as food, though:

enter image description here

Adrian Zhang 10/31/2018.

Yes, but it's extremely small.

Bananas do have a very small amount of radioactivity, but as showed by the chart linked in another answer, it's a really small amount, compared to the amount you are exposed to by being around everyday items/doing everyday activities.

You would need to eat several million bananas in a short time span to actually suffer ill effects/die, which we all know is basically impossible. The bananas would've probably killed you some other way.

Basically, don't worry.

j4nd3r53n 10/31/2018.

Well, yes to both, up to a point. All things are radioactive - radioactive isotopes occur in minute concentrations in nature, so stones, trees, water, air, and indeed fruits are radioactive, and it can be measured too, but only because our instruments are very sensitive. Life has evolved in this environment for ~4 billion years, and it is clearly not enough to harm us. As for the second question - if you will forgive the tongue-in-cheek answer - anything will kill you if you eat too much; that could be concidered the definition of 'too much'. But I think you will have to eat an incredible number of bananas, and it won't be the radiation that kills you, but the overeating. - Download Hi-Res Songs

1 Alan Walker

On My Way flac

Alan Walker. 2019. Writer: Alan Walker;Sabrina Carpenter;Farruko.

Here With Me flac

CHVRCHES. 2019. Writer: Steve Mac;Martin Doherty;Marshmello;Lauren Mayberry;Iain Cook.
3 5 Seconds Of Summer

Who Do You Love flac

5 Seconds Of Summer. 2019. Writer: Andrew Taggart;Talay Riley;Oak;Sean Douglas;Luke Hemmings;Calum Hood;Ashton Irwin;Michael Clifford;Trevorious;Zaire Koalo.
4 Bonn

No Sleep flac

Bonn. 2019. Writer: Albin Nedler;Bonn;Martin Garrix.
5 Avril Lavigne

Crush flac

Avril Lavigne. 2019. Writer: Johan Carlsson;Avril Lavigne;Zane Carney.
6 Katy Perry

365 flac

Katy Perry. 2019. Writer: Zedd;Katy Perry;Caroline Ailin;Corey Sanders;Daniel Davidsen;Cutfather;Peter Wallevik.
7 Alan Walker

Are You Lonely flac

Alan Walker. 2019.
8 Jonas Brothers

Sucker flac

Jonas Brothers. 2019. Writer: Kevin Jonas;Joe Jonas;Nick Jonas;Ryan Tedder;Louis Bell;Frank Dukes.
9 Brooks

Better When You're Gone flac

Brooks. 2019. Writer: David Guetta;Emma Lov Block;Ido Zmishlany;Jackson Foote;Jeremy Dussolliet;Brooks.
10 Dido

Hurricanes flac

Dido. 2019. Writer: Dido;Rick Nowels;Rollo Armstrong.

Happy flac

DEAMN. 2019.
12 Ariana Grande

Bloodline flac

Ariana Grande. 2019. Writer: ILYA;Max Martin;Savan Kotecha;Ariana Grande.

Rise flac

IZ*ONE. 2019.
14 Avril Lavigne

Dumb Blonde flac

Avril Lavigne. 2019. Writer: Mitch Allan;Bonnie McKee;Nicki Minaj;Avril Lavigne.
15 Little Big Town

Don't Threaten Me With A Good Time flac

Little Big Town. 2019. Writer: Thomas Rhett;Karen Fairchild;The Stereotypes;Jesse Frasure;Ashley Gorley.
16 Ariana Grande

Make Up flac

Ariana Grande. 2019. Writer: Brian Malik Baptiste;Tayla Parx;TBHits;Victoria Monét;Ariana Grande.
17 Dzeko

Halfway There flac

Dzeko. 2019.
18 Ariana Grande

Imagine flac

Ariana Grande. 2019. Writer: JProof;Priscilla Renea;Happy Perez;Andrew "Pop" Wansel;Ariana Grande.
19 Ariana Grande

NASA flac

Ariana Grande. 2019. Writer: Ariana Grande;Scootie;Tayla Parx;TBHits;Victoria Monét.
20 Ariana Grande

Thank U, Next flac

Ariana Grande. 2019. Writer: Crazy Mike;Scootie;Victoria Monét;Tayla Parx;TBHits;Ariana Grande.

Related questions

Hot questions


Popular Tags