Easy polonium-beryllium neutron source: assembly, disassembly, and discussion

A 5-millicurie sealed Po-210 source leased commercially for antistatic applications is brought into contact with a piece of bulk beryllium metal in the proximity of a He-3 neutron detector, with the resulting neutrons being detected. This assembly is taken apart and reassembled several times in the course of the video, as we watch the neutron counter respond. My objective is to illustrate the prolific Be(a,n) reaction in a concrete embodiment, which I suggest is a (relatively) safe, easy, and inexpensive