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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bragg–Gray cavity theory ： ウィキペディア英語版 Bragg–Gray cavity theory According to the Bragg–Gray cavity theory, the ionization produced within a gas-filled cavity inside a medium is related to the energy absorbed in that surrounding medium. It was developed in 1936 by British scientists Louis Harold Gray, William Henry Bragg, and William Lawrence Bragg. If the cavity is small enough that it does not change the number or energy distribution of the electrons that would exist in the medium in the absence of the cavity, and the energy is deposited only by electrons passing through the gas-filled cavity, then ::$E\_\backslash nu\; =\; J\_\backslash nu\; \backslash cdot\; W\; \backslash cdot\; \backslash rho$ where :$E\_\backslash nu$ is the energy absorbed per unit volume of the medium :$J\_\backslash nu$ is the ionization per unit volume produced in the gas :$W$ is the average energy lost by the secondary electrons per pair of ions formed in the gas :$\backslash rho$ is the ratio of the stopping power of the medium and the gas for the secondary electrons ==References== # Khan, F. M. (2003). The physics of radiation therapy (3rd ed.). Lippincott Williams & Wilkins: Philadelphia. ISBN 978-0-7817-3065-5. # Gray, L. H. (1936). An ionization method for the absolute measurement of $\backslash gamma$-ray energy. ''Proceedings of the Royal Society A'', 156, pp. 578–596 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bragg–Gray cavity theory」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.