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54.經直線加速器的加速管(accelerator tube)加速的電子,聚焦後直徑約為多少mm?
(A)0.3
(B)3
(C)30
(D)300


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JOJO!!!!!!!! 大一上 (2018/05/20)
翻開放射治療物.....觀看完整全文,...


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Steven Huang已 大四上 (2019/01/10)

出處:放射治療物理學 5/e p.44

As the high-energy electrons emerge from the exit window of the accelerator structure, they are in the form of a pencil beam of about 3 mm in diameter(以3mm直徑的筆型射束型式射出). In the low-energy linacs (up to 6 MV) with relatively short accelerator tube, the electrons are allowed to proceed straight on and strike a target for x-ray production.

54.經直線加速器的加速管(accelerator tube)加速的電子,聚焦後..-阿摩線上測驗