발사체 입자가 산란될 확률 H는 모든 산란 중심 둘의 단면적 합을 전체 면적 A로 나눈 것이 된다.
The probability H that any given projectile particle has a scattering event can be stated as the sum of the areas of all scattering centers divided by the area A over which they are spread.