Fatman and Missile damage in the Creation Kit

[HorseKingHercules]

I know how to edit the base explosive damage of the missile explosion and mini nuke explosion but what i don't know is how the outer radius, inner radius, and is radius is calculated.

 

I changed the explosive damage of the fatman mini nuke explosion to 1500 and the missile launcher's missile explosion to 700 and i wanna know how control the damage with the inner radius, outer radius, and is radius.

 

Does anyone know hows its calculated? Thanks in advance.