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ConceptJunkie12/10/20241 replyview on HN

> If you want some antimmater, you can go to your nearby physics suply store and buy some radioactive material that produce positrons

Or buy some bananas. You'll get a positron every once in a while from the occasional Potassium-40 decay.


Replies

gus_massa12/10/2024

I had to look up. Most of the radioctive potassium 40 in bananas decay by electron emmision. A tiny part by positron emision 0.001%. So you will get a lot of noise in the radioacivity detector.

A few sources like https://alpha.web.cern.ch/science/positron-source and https://ifj.edu.pl/private/jdryzek/page_r12.html recomend sodium 22.