"Ten million atoms isn't cool, you know what's cool? Ten thousand atoms" *
Occasionally Asked Questions
"Ten thousand atoms ... " Apologies to Aaron Sorkin ("The Social Network") for mangling your quote. It's easy to measure Be-10 at a concentration of ten million atoms per gram. Ten thousand atoms per gram is starting to get difficult.
One gram of quartz (SiO2) contains 3 * 6.0221 x 1023 / (28.0855 + (2 * 15.9994)) = 3.007 x 1022 atoms, so 104 atom/(g quartz) corresponds to a concentration of 3.3 x 10-19 atom/atom, less than a part per billion of a part per billion.
Group leader What this really means is that I'm responsible for donuts at the weekly group meeting.