physical barriers designed to provide protection from the effects of ionizing radiation, including radioactive material / the technology of providing such protection

(physics, chemistry) The study of the chemical changes that result from the absorption of ionizing radiation.

(physics) The pressure exerted by electromagnetic radiation on an object on which it impinges, as a consequence of its momentum.

(medicine) The use of ionizing radiation to treat disease, especially cancer.

Someone who works with radiography. This term seems to be more common in British English.

A device that measures radiant energy.

(physics, chemistry, medicine) A radioactive isotope which, when injected into a chemically similar substance, or artificially attached to a biological or physical system, can be traced by radiation detection devices.

material settling from a radioactive plume, and its subsequent surface deposition

wireless telegraphy

To communicate or transmit by wireless telegraphy.