輝度

brightness

[目次：照射系(電子銃／高圧系)]

電子光源の明るさを単位立体角度あたりの電流密度で表わしたもの。陰極の先端が小さいほど輝度が高い。光学系に収差がなければ、光学系のどの位置でも輝度は一定に保たれる。

"Brightness" means the current density per unit solid angle, which is a measure of the quality of an electron source. As the tip of the cathode is smaller, the brightness is higher. The brightness is kept constant at any stage of an optical system if the optical system is free from aberrations.

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