Table 6‑2: Description of different dose-depth methods and their applications

Shielding Geometry	Description of Source		Application
Finite slab shielding	Isotropically incident over 2p steradians		Used to quantify effects of spot shielding on components and self-shielding in active antenna arrays.
Semi-infinite slab shielding	Isotropically incident over 2p steradians		Used to quantify radiation dose to components near to the surface of a spacecraft (the majority of the spacecraft provides effectively an infinite shield over 2p steradians).
Solid spherical shielding	Isotropically incident over 4p steradians		Used for conditions where components are shielded to a finite level over all solid angles. Most common geometry used for the dose-depth curve of sector shielding analyses.
Spherical shell shielding ^a	Isotropically incident over 4p steradians of shell of user specified thickness and inner radius		Used for components shielded to a finite level over all solid angles and sometimes in sector shielding analysis.
^a When using the spherical shell shielding method, the inner radius of the shell can be difficult to quantify precisely.