scatter (radiation) by the atoms of the medium through which it passes
backscatter详细解释
back.scat.ter n.（名词）The deflection of waves or particles by electromagnetic or nuclear forces through angles greater than 90= to the initial direction of travel.背向散射，逆散射：波或粒子在电磁力或原子力的作用下，通过大于90°的角向起始方向的反射 【引伸】 back.scat.ter v.（动词）
