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What (who) is dose$22743$ - definition
![Using early [[Crookes tube]] X-Ray apparatus in 1896. One man is viewing his hand with a [[fluoroscope]] to optimise tube emissions, the other has his head close to the tube. No precautions are being taken.](https://commons.wikimedia.org/wiki/Special:FilePath/Crookes tube xray experiment.jpg?width=200 "Using early [[Crookes tube]] X-Ray apparatus in 1896. One man is viewing his hand with a [[fluoroscope]] to optimise tube emissions, the other has his head close to the tube. No precautions are being taken.")
.1.ajb.jpg?width=200 "The Radiology Martyrs monument, erected 1936 at St. Georg hospital in Hamburg, more names added in 1959.")
![Graphic showing relationship of "protection dose" quantities in [[SI]] units](https://commons.wikimedia.org/wiki/Special:FilePath/SI Radiation dose units.png?width=200 "Graphic showing relationship of \"protection dose\" quantities in [[SI]] units")
Wikipedia
In external beam Radiotherapy, transverse and longitudinal dose measurements are taken by a radiation detector in order to characterise the radiation beams from medical linear accelerators. Typically, an ionisation chamber and water phantom are used to create these radiation dose profiles. Water is used due to its tissue equivalence.
Transverse dose measurements are performed in the x (crossplane) or y (inplane) directions perpendicular to the radiation beam, and at a given depth (z) in the phantom. These are known as dose profiles. Dose measurements taken along the z direction create radiation dose distribution known as a depth-dose curve.
