Interesting...
This is a guy from Northeast China whose entire YT channel is devoted to testing out all kinds of arrowheads on all kinds of material, from industrial high pressure insulation to military Level 1-3 vests and various plate inserts. So far the ONLY object that has been able to stop all kinds of arrows is this current issue PLA specops helmet he obtained. Even the heaviest rated soft plates did not survive a tungsten bodkin on a 500-600 grain shaft from either a 55lb ILF recurve or 60lb compound at 210 FPS for the former and 320 FPS for the latter. This helmet ate it all up and powered through...
On a related note, it seems like depleted uranium is actually legal to own by civilians in the US as the material is barely more radioactive than uranium glass ornaments that are used for decor, and it's risk of particulate dispersal is also low. DU is the densest metal in commercial existence with superior armor piercing capabilities due to it's self-sharpening effects as it burrows through a target. At one point, DU tipped .308 rifle ammunition had been available on the civilian market in small quantities and one can still find them here and there at smaller, out of the way gun shows. It would be interesting to test if a depleted uranium bodkin point on an arrow fired out of the same rigs and poundage listed above could defeat that kind of helmet, or if DU projectiles need to be accelerated to certain velocities before it's incendiary and self sharpening effects become apparent.
ETA: Depleted uranium flechette in a 3D printed discarding sabot from a 12 gauge shell would also be fun AF to test. I don't think even .50 BMG rated AR500 plate is surviving that.
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US NRC General License
US Nuclear Regulatory Commission regulations at 10 CFR 40.25 establish a general license for the use of depleted uranium contained in industrial products or devices for mass-volume applications. This general license allows anyone to possess or use depleted uranium for authorized purposes. Generally, a registration form is required, along with a commitment to not abandon the material. Agreement states may have similar, or more stringent, regulations.