We are thinking about tin or tin alloys for an electron beam shielding application for radiotherapy. It could potentially replace Cerrobend (bismuth/lead alloy), which would in particular, enable us to cast squares of ~1cm thickness, and then waterjet specifically shaped cutouts. All the material could then be re-melted for ongoing use, which is how it's currently done with Cerrobend. Currently, positives of the the cutouts are shaped on a CNC foam cutter and then the Cerrobend is cast around them, which is a more labourious workflow and there's a room full of bismuth/lead. You obviously don't want that near your waterjet tank lest you turn the whole thing into toxic waste. It turns out that tin has potentially good absorbtion characteristics in the energy range of interest. We're going to get ourselves a sample to fool with but I was wondering if anyone had experience machining either pure tin or pewter (Sn/Sb/C), which is harder. There's some applications where one might want to actually machine it to fit in an apparatus, but I'm mostly curious about how it will waterjet vs say steel or aluminum. Steel, which you could use in this cutout application, is about 2.5 times tougher to waterjet than aluminum for example. Worse, Iron doesn't have great absorbtion characteristics where we need it so you'd have to make a steel plate much thicker so waterjetting would get that much slower and more expensive. I'm hoping pewter is closer to aluminum in waterjet toughness factor and we can use thinner sheets. In case anyone's interested, here's some absorption data from https://physics.nist.gov/PhysRefData/XrayMassCoef/tab3.html The upward spikes are where incident X-rays excite the atoms' various inner electron orbitals. You can see here there's a region above 30keV where tin is way better than Iron.