The absorption term also is relatively straight forward, macroscopic absorption cross section times the flux.
吸收项也是相对直接的，宏观吸收横截面乘以流量。
2
You take the flux, multiply it by the cross section, average it, integrate it over the whole volume.
你拿流量乘以横截面，平均它，乘以它除以总容积。
3
The rotating irradiation model for ND silicon presented in this paper gives distribution, mean value and heterogeneity of the thermal flux on the cross section of silicon.