No. Irradiated and radio active are not the same. Radio active means the mass is letting off high energy light or particles from the atoms inside falling apart. This is called nuclear decay and is what makes power plants and bombs work. Irradiated means the mass was hit by these particles. When these particles hit they can do many different things like ripping off an electron, being absorbed into the nucleus, bouncing off, or passing through. This can damage the material but will not make lead radio active.
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