[Zeno]

Tape, plastic application etc may help in slowing down the breathing in of dust or other particles that are potentially radioactive (internal exposure). This would help in the case of alpha radiation most but much less so or not at all for external exposure to gamma, beta, or x-ray type radiation. And means nothing to the mother of all radioactivity - Neutrons.

It is a bit of a joke but it makes people feel less helpless. That there is something, however small, that can be done. Hence, it is a morale booster to some people.

-Zeno