Al2O3厚度越大，则占用了燃料棒以内的空间，同时，已有研究结果表明，涂层厚度越大，在热循环热应力的影响下更容易开裂。涂层越厚，则相同时刻氚释放通量越低。但即使Al2O3厚度为1μm，氚释放通量也是非常低的，这说明仅仅需要很薄的Al2O3涂层就能取得很好的阻止氚释放的作用。

The greater the thickness of Al2O3, the more space it occupies within the fuel rod, and the higher the thickness of the coating, the easier it is to crack under the influence of thermal cycling thermal stress. The thicker the coating, the lower the tritium release flux at the same time. However, even if the thickness of Al2O3 is 1 μm, the tratium release flux is very low, which means that only a thin Al2O3 coating can achieve a good effect of preventing tritium release.