A well operated fusor is a great source for neutrons. I have run tests just recently and found that I prefer silver activation best of all. If you are willing to take great care and can transfer your silver within 10 seconds from the moderator to a "digital readout" geiger counter, 100,000 neutrons per second, isotropic will give an easy proof that you have activated silver. The exposure time for the fast silver would take and exposure of only 2 minutes, but the longer you go, the second longer lived isotope, builds up over many minutes. 300,000 or more n/s, isotropic will activate most any of the easy activated elements based on their half lives and times of exposure.
It is to be remembered that ever larger numbers of neutrons per second will not activate any element faster, but instead to higher levels of radiation emission, (specific activity), per unit time of exposure. Likewise exposure times at a given neutron rate of more than 5 times the half life of the expected activation product will gain nothing as the isotope would be in equilibrium. (decaying as fast as it is produced.)
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.