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Radiology
Chapter 6 Vocab
Term | Definition |
---|---|
Collimation | The restriction of the useful beam to an appropriate size. |
Added Filtration | Added to the inherent filtration built into the x-ray machine. In the form of thin disks of pure aluminum. |
Inherent Filtration | Filtration built into the x-ray machine by the manufacturer. |
Total Filtration | The combination of inherent and added filtration in an x-ray machine. |
Half Value Layer | Thickness of a specified material that, when introduced into the path of a given beam of radiation, reduces the exposure rate by half. |
Lead Apron | Protectie barrier made of lead or lead-equivalent material. Shields patient from during dental x-ray exposures. |
Maximum Permissible Dose | (MPD). Maximum accumulated dose that persons who are occupationally exposed may have at any given time of their life. |
Optically Stimulated Luminescence | (OSL). A personel radiation monitor that absorbs radiation similar to TLD, but crystals release energy during optical stimulation instead of heat. |
Primary Beam | The original undeflected useful beam of radiation that emanates at the focal spot of the x-ray tube and emerges through the aperture of the tube head. |
Radiation Worker | A radiographer or professional who works with or around ionizing radiation or equipment that produces ionizing radiation. |
Scatter Radiation | Radiation that has been deflected from its path by impact during its passage through matter. |
Thermoluminescent Dosimeter | (TLD). Monitoring device containing certain crystalline compounds that store energy when struck by x-rays. When heated the crystals give off light in proportion to the amount of radiation exposure. |
Thyroid Collar | An attached or detachable supplement to the lead apron. |