If you remember, one of David's first findings was the appearance of iridium during a 300 second burn. When strongly excited, silver has a peak at 3513.38 angstroms. If you call him, he has a bigger machine in Germany which will produce macro quantities of precious metals. Yes, of course, it is a prototype and costs a great deal of money. He has spent enormous energies in this field, and as a person I have great respect for his driving energies.
Neutron activation means that high energy neutrons are sent into an extremely small sample.
The instrument then monitors their radiation decay. It will be become radioactive.