紫外光由一支汞弧灯产生，它可使28只样品同时受到辐射，所需照射的时间可以自动控制。
UV light is produced by a Mercury arc lamp, 28 samples can be simultaneously irradiated. The times needed for irradiation are controlled automatically.
利用X射线对气体分子的电离作用，在一定电压下用一束X射线照射真空灭弧室，使灭弧室内产生电离电流。
The remainder molecules in the vacuum tube will be ionized by X-ray irradiation, the ionization current can be detected at a constant DC voltage.
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