I have done that town with 2 Rad-X's and a couple of Rad A Aways. However a Radiation suit is very helpful, even if it is a normal one.
I think the PipBoy reports go no lower than 1 Rad/Sec, but your actually absorption rate is lower if you have protection from Rad X or a Suit.
This is true, with 85% resistance (rad-X plus space suit and 7? endurance) I stood in a +1 rad/sec place (as in, normally +1 rad/sec with rad resistance of 15% odd) and got one every 7 or 8 seconds or something, it goes up very slowly. Of course as the rads go up it will climb faster, if you're in a normally +4 area with 85% resistance it should still be less than one, but not much.
There is also an advanced radiation suit near Novac. On the pip-boy map look at Novac and take the road east then south, should be a kinda windy road (you want to follow the road, not come from the south, trust me). There are dangerous animals in the ruins for lower level characters but if you're careful you can get the suit easily without being spotted, it's on a fella in front of the ruins.