Hello,Does that say raduim? do you mean radiation?And just for canons sake, its Vault-Boy. I too used to call him Pip-Boy, but yeah its actually Vault-Boy.
Racoon beat me to it. It's Vault boy. The pip boy is the computer we all wear out in the wasteland. Or at least it is in fallout 3 and NV. I think it's still technically wrist mounted in 1 and 2 but you get what I mean.