It's not what I mean, Lex. First and foremost lead is highly toxic during its production. It causes lead poisoning that isn't too far from radiation sickness. Symptoms may include blindness, hearing loss, insomnia, delirium, memory loss or hallucinations. But that's not the worst. [Archer pauses for a moment. He wishes there was some kind of safe solution already present. Surprisingly he knows a lot about radiation and can actually use it to protect others from possible mistakes.]

It's true that lead is used to shield from various kinds of radiation. Unfortunately in the case we're now dealing with such shielding will cause a secondary and even more dangerous radiation as a byproduct.