[IYAAYAS]

"The objects, one appearing to be a pipe bomb and another that appeared to be a paint can". Factoid- most paint cans do not show much more than background. I have never personally checked a pipe bomb with a Geiger counter."

A lot of pipe bombs could be lead pipe, if the devices are lead cylinders with radioactive contents it would need to be a mostly beta or gamma radiation source. That would rule out smoke detector or lamp filament type things.

[Hazcat]

Beta will not make it through lead. Gamma would but only if the source were strong enough. (US Amry 54E (NBC)1983)

[ARealMothersSonForever]

All plumbing pipe today is galvanized steel. Lead actually is much too soft for waterpipes. Lead jacketing has pretty much been done away with, except in some sewerage applications. No matter, any explosives mixed with radioactive material equals a dirty bomb.