And then of course as part of the absorption we have a fissioncrosssection which, as I said earlier, is what we want to focus on so we can make some power and some heat.
We call that a crosssection which is the microscopic crosssection which as we mentioned before could be absorption, capture, fission, scatter.
我们称为一个横截面,那是宏观横截面,那我们之间提过的,可能是吸收,捕获,裂变,散射。
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We can then look at uranium 238 which has a relatively low absorption thermal energy range and essentially has no fissioncrosssection which is why we call uranium 238 a fertile atom.