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cobalt, easy. i did a project in high school using a radioisotope of cobalt to "make" anti-matter. make is a strong term, positrons were created by the decay of the isotope, it wasnt an active process. i was going to make a cheap cloud chamber to see it, but more lucrative projects kinda forced me to abandon it altogether. ive still got the isotope though, its currently irradiating my car lmao
