Radiation Physics Vocabulary

3. Scale of radiosensitivity on CT scans
4. Three principles of radiation protection
8. Interaction of photon with inner-shell electron
11. Replaces the flattening filter for electron treatments
12. Monitors and samples the Linac beam for symmetry
15. Abbreviation for imaging devices mounted on a Linac
16. The change in the apparent position of an object when viewed from different points
17. Source of microwave power for a Linac
18. The weight of a particle when it is not moving
20. Substance made up entirely of one kind of atom
21. The amount of energy required to remove an electron from an atom
23. Interaction of photon with outer-shell electron
27. An electron has a -------- charge
28. Discovered radioactivity in 1902

1. Photons emitted as electrons are slowed down by the electric field near a nucleus
2. Reduction in intensity as an x-ray moves through matter
5. Incorrect application or delivery of prescribed dose
6. Smallest unit of an element that retains the properties of that element
7. The number of protons in the nucleus, Z
9. Shapes the x-ray beam in its cross-sectional dimension
10. Time required for the activity of a radioisotope sample to decay to half of its initial value
12. Elements that have the same number of Protons, but a different number of Neutrons
13. Emission or transmission of energy in the form of waves or particles through space or material
14. Energy deposited in matter by ionizing radiation per unit mass
19. Force responsible for the interaction between electrically charged particles.
22. Describes the relationship between intensity of a radiation beam and distance from the source
24. The degree of darkening on an image
25. Conveys microwave power to the accelerator structure in the gantry
26. Three-dimensional representation of image information