较低的一层俘获通过上层的未经干扰的波长较长的光线，也能吸收顶层重新放射和侥幸逃脱的低能量的光。
The lower one captures longer wavelengths that have passed unperturbed through the upper, and also any lower-energy light that has been re-emitted within the top layer and somehow escaped.
产生这种现象的原因是场效应管氧化物中的空间俘获电荷与吸收剂量近似成线性变化，对阈值电压变化和吸收剂量有近似线性的改变；
It is found that the change of threshold voltage value fits in exponential law with absorbed dose, which is caused by the effect of space charge and interface charge.
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