Yep. I read the article after you posted it. It's their fantasy, not yours. The other article was the one that mentions implanting plutonium or uranium into the diamond, and that actually makes technical sense, But in some sense it does not matter whether they are off by a factor of a trillion on the amount of C14, or they use P or U. There are no useful radionuclides that decay without emitting much of their energy as gamma radiation, and you need a whole bunch of mass to convert that gamma rad
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