Yeah, the Mars Liberation Front may use it to attack City 1!

It‘s the battery tech, which is classified military stuff. I presume it’s a thing you put in submarine detectors deep in the ocean, or compact spy satellites.

But indeed, it’s the type of radioisotope that’s dangerous to just be around, where minuscule amounts could fuck up the whole village. But terrorists would probably rather get their hands on emitters from the medical field than fly to mars.