Look. I say ditch the weird video; those rarely ever have anything to do with the song.
Guys... Alot of you have it wrong. It's not a meaningless, apocolyptic song. It does have very good message. See
Radioactive elements are constantly changing. So, he's saying that he can constantly change, and constantly adapt to the heck life can be sometimes. Life can be horrible, enough to 'make your systems blow' especially sometimes. In the begining
I'm waking up, to ash and dust
A wipe my brow and sweat my rust
I'm breathing in the chemicals
I'm breaking in, shaping up, checking out on the prison bus
This is it, the apocolypse
He's saying he woke upto metaphorical ash and dust, both stuff that can choke you, but next he's saying he tries to shake it off and get away. Next he realises you can't run away from you problems, they are like chemicals in the air. Next, he's preparing for the challenge, but still a bit hesitant and upset. Then he's saying how he feels like it could be the end, the apocolypse of him.
I'm waking up,
I feel it in my bones
Enough to make my systems blow
He's awakening, truely excepting the tough spot in life he was meant to have. He can tell from now on things will not be easy, and it would be enough to 'make his systems blow,' per say, that it's so hard.
welcome to the new age, to the new age(x2)
I'm RADIOACTIVE, RADIOACTIVE(x2)
He's now welcoming himself the changes or hardships(the new age), because now he know he can do it. He's radioactive because he knows he is strong enough to withstand it, to adapt, to survive.
I wave my flags,
I don my clothes,
it's a revolution I suppose
We're painted red,
To fit right in
I'm breaking in, shaping up, checking out on the prison bus,
This is it, the apocolypse
He's trying to conform to the changes, relolutionizing his thoughts to how they have to be now to survive the new challenges. But the world keeps 'painting him red to fit right in.' this means all the people doubting him, trying to ignore struggle, and so it makes him rethink things and his hope is thus torn down for awhile, and once again he feels it could be 'the apocolypse' of him or happiness.
same meaning as before
All systems go, sun hasn't died
Deep in my bones, straight from inside
He's realising that he really can live on, adapt, and survive(all systems are still working). The sun hasn't died; by this he means through all this, his hope and hapiness has lasted through the struggles so far. Deep in the bones/straight from inside; he's feeling more and more confident that he has it in him to continue through the harsh realities he has been faced with, and he's building up to explain the chorus once more, but with more strenghth.
same as before, but now he's saying that he WILL make it through, not could.