So if you take a certain volume and you have a certain amount of material, let's just take the fissioncrosssection as the issue.
所以,如果你得到一定的容积,你有一定量的材料,我们就把裂变横截面当做问题。
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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.