And that is measured as a macroscopic cross section of absorption thermal divided by the integral of all energies in terms of absorptions.
那是被测量的，作为吸收热能的，宏观横截面，除以全部的，吸收的能量的乘积。
2
This chart gives you a summary of some of the critical thermal-neutron cross sections of important fissile and fertile nuclides.
这个图表给你们一个重要的,可裂变和可转换核素的,一些临界热能中子横截面的总结。
3
We can then look at uranium 238 which has a relatively low absorption thermal energy range and essentially has no fission cross section which is why we call uranium 238 a fertile atom.