Bananas are sources of antimatter!

Little post in honor of Friday.

Many people know about the radioactivity of bananas. Did you know that bananas are also sources of antimatter?
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I propose to discuss an entertaining article published in Symmetry Magazine a couple of years ago.
A student at Cornell University said that bananas are sources of positrons.

We all know the so-called natural sources of radiation (recall, for example, the story of radioactive objectives made of glass containing thorium).

Today's post is dedicated to potassium, and more specifically to its potassium-40 isotope. In natural potassium contains 0,0117% of this isotope.

This isotope has the following decay directions:

1. β – decay (probability 89.28%):
   
2. The capture of an orbital electron (probability 10.72%):
   
3. Positron decay (occurs extremely rarely, with a probability of 0.001%):
   

It is no secret that bananas contain relatively large amounts of potassium, and therefore are radioactive. In nuclear physics, there is even the concept of a banana equivalent , which characterizes the activity of a radioactive source by comparing it with the activity of potassium-40 contained in a normal banana.

Based on the data that the average banana contains about 0.42 grams of potassium, I suggest you discuss and check (confirm, deny, panic and put on a foil cap) the following assumption:

An average banana produces one positron every 75 minutes.

Good luck!

Sources:
symmetrymagazine.org/breaking/2009/07/23/antimatter-from-bananas
thescience.ru/2013/09/20/antimatter-from-bananas