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The saturation current from a thoriated-...

The saturation current from a thoriated-tungsten cathode at `2000 K` is `100 mA`. What will be the saturation current for a pure-tungsten cathode of the same surface area operating at the same temperature? The constant `A` in the Richardson-Dushman equation is `60 xx 10^4 A m^(-2) K^(-2)` for pure tungsten and `3.0 xx 10^(4) A m^(-2) K^(-2)` for thoriated tungsten. The work function of pure tungsten is `4.5 eV` and that of thoriated tungsten is `2.6 eV`.

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