The Constitution doesn't mention radioactive materials, because they didn't exist
I'm surprised you don't understand what the Constitution is. The Constitution cedes specific powers to the Federal government and restricts all other powers from them. Again, it restricts all other powers from them, it does not grant all other powers to them.
So think about what you said. "radioactive materials ... didn't exist."
If you understand what the Constitution actually is, that means by default that the Federal government by has NO say over radioactive materials unless the people give them that say. Read the 10th amendment.
The people have the power to amend the Constitution and give the Federal government power of regulating radioactive materials. The process is 2/3, 2/3 and 3/4. They have not done that. Therefore, the Feds do not have a legitimate Constitutional power over radioactive materials.
The State governments can however say killing your neighbors with radioactive materials is murder.
Also, the idea that the second amendment only applies to muskets is silly. Obviously they means arms as they advance technilogically. Nowhere in the Constitution or their private writings did they say they meant muskets.
In fact they strongly contradict that as they did often write that they wanted the people to be armed as well as the government and obviously they didn't want to limit the government to muskets either
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