> 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.
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.
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.