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The Bragg curve plots the energy loss of ionizing radiation during its travel through matter. For protons, α-rays, and other ion rays, there is a pronounced peak in the curve immediately before the particles come to rest. This is called Bragg peak, for William Henry Bragg who discovered it in 1903.
Additional recommended knowledge
When a fast charged particle moves through matter, it ionizes particles and deposits a dose along its path. A peak occurs because the interaction cross section increases as the charged particle's energy decreases. In the figure to the right, it is the narrow peak of the native proton beam curve which is produced by a particle accelerator of 250 MeV. The figure also shows the absorption of a beam of energetic photons which is entirely different in nature; the curve is mainly exponential.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bragg_peak". A list of authors is available in Wikipedia.|