bombard

bom·bard

(bom-bard'),

To expose a substance to particulate or electromagnetic radiations for the purpose of making it radioactive.

[Mediev. L. bombarda, artillery assault, fr. bombus, a booming sound]

bombard

[bombärd′]

to shower a drug or tissue sample with radioactive particles from a nuclear isotope source.

bombard

Military
To attack an enemy’s “soft targets”—undefended objects, houses, public buildings—with concentrated artillery with the intent of demoralising civilians and having them pressure their leaders into surrender. Initially defined as use of land-based heavy guns, bombardment has evolved into an equivalent of aerial bombing with the advent of military aviation.
 
Radiation physics
To expose a material to a beam of ionising radiation or highly charged particles.