[mattheww]

Did my thesis research at Brookhaven National Lab, home of the Relativistic Heavy Ion Collider (RHIC), which is the predecessor of the heavy ion program at the LHC.

While there, one of the more senior scientists relayed an exchange from an ongoing review of the program. At the time, RHIC was colliding gold in the heavy ion program.

One of the reviewers asked if RHIC could save money by switching to a cheaper element, like lead. None of the RHIC representatives knew what to say. I don't remember the exact numbers, but RHIC used something like < 1 milligram of gold over the lifetime of the program.

[levocardia]

I worked at a lab for a while that had a atomic layer deposition setup for gold. I believe they charged a modest amount (a few cents? a few dollars?) per single-atom layer of gold. The device had a bell-shaped chamber that you would place your wafer into, but of course no matter how big or small the wafer was, the entire interior of the chamber got an even coating of gold. The technician who operated it had a ring he would put inside the chamber alongside his own samples, so over the course of several years he had gradually accumulated enough layers to "turn it into gold."

[eternauta3k]

Does the gold ever get recovered from the chamber wall?

[EricLeer]

Jeah, the lab where I worked cleaned the machine on a 1-2 month basis. All the cleaned out metals where then sold to a recycler.

[jonny_eh]

Well, if they had swithced to lead maybe they'd have generate multiple milligrams of gold by now?