... it might have something to do with exactly that.
The Doctor sighed. "I'm very sorry to hear that."
He knew what radiation was to human beings. Bruce was lucky to be alive.
"Well, the TARDIS is no threat. If anything, she's your best ally. She's safer than houses. And as it turns out, walls. I think her concern is for her power core and that no further damage be caused to her circuitry. But she has a full library and a lot of very calming things to read. Even has a pool."
He beamed. The Voice Interface System disappeared.
What do you mean you can help?
"Well, I don't know that I can just yet, but I would like to try. I'm an alien, Bruce. I have different technology than you've encountered before--even if you met another version of me, he didn't have all the same stuff I do. It doesn't work that way, really. I'm a Doctor. I'm 900 years old, and I like to keep things from other cultures I find helpful."
He let that sit there.
"Would you allow me to study you a little bit? Take some blood, things like that?"