2．1．6辐射长度（Radiation Length） 辐射 长度：对于给定的靶物质，粒子经过一定厚度，由于产生的轫致辐射，平均电子能 量减少到它最初能量的1／e。
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For good reception, the length of an antenna needs to correspond with the wavelength of the radiation it is receiving.
为了很好地接受信号，天线的长度需要对应它接受的信号的波长。
Design should recognize that burner flame length shortens and intensity of radiation increases as pressure increases.
设计时必须认识到当压力增加时火焰的长度缩短而辐射强度增加。
In order to reduce the loss of radiation and take into consideration the coupling length of divider waveguides, Y divider angle is designed with 2 degrees.
为减少分支处的幅射损耗，并考虑分支器波导耦合长度，Y 分支器的分支角度设计值为2 度。
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