Something is off here. Here is how you transport Californium-252 https://en.wikipedia.org/wiki/Californium#/media/File:CfShield.JPG https://en.wikipedia.org/w

Something is off here. Here is how you transport Californium-252 https://en.wikipedia.org/wiki/Californium#/media/File:CfShield.JPG https://en.wikipedia.org/wiki/Californium#/media/File:CfShie... A giant flask filled with polyethylene or water (lead won't work). That's for 1 gram only! 18 grams is just a ridiculous amount. I suspect it is not Californium-252 but another isotope (251?) or maybe not Californium at all. But yeah it is the most expensive commercially produced substance currently. And smuggling it would make sense from that point of view. However being bombarded by deadly neutrons while handling it, probably ensures you won't be doing it for long.