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4. a tube or box fitted with a screen coated with a fluorescent substance, used for viewing objects, especially deep body structures, by means of x-ray or other radiation.
6. is energy that comes from a source and travels through space at the speed of light.
8. radiation a stream of atomic or subatomic particles that may be charged positively or negatively or not at all
9. platinocyanide it was the first radiation detector.
11. tube device invented by Sir William Crookes consisting essentially of a sealed glass tube from which nearly all the air has been removed and through the walls of which are passed two electrodes.
12. is the metallic electrode through which current flows out in a polarized electrical device
14. radiation is light that travels by oscillating in waves at a constant speed carrying energy.
15. tube a cathode ray tube used for x-ray production, in which a beam of thermoelectrons is produced by heating a wire cathode.

1. an image produced on a radiosensitive surface, such as a photographic film, by radiation other than visible light, as by x-rays passed through an object.
2. is the light given off by certain substances when it absorbs light or other electromagnetic radiation.
3. tube device usually consisting of a sealed glass or metal-ceramic enclosure that is used in electronic circuitry to control a flow of electrons.
5. any process by which electrically neutral atoms or molecules are converted to electrically charged atoms or molecules.
7. rays, a beam of electrons emitted from the cathode of a high-vacuum tube.
10. is a heavy radioactive gaseous element formed by the decay of radium.
13. is a positive electrode