ConstantRadioactiveHeat(H_r=1e-6Watt/m^3)

Set a constant radioactive heat:

\[ H_r = cst\]

where $H_r$ is the radioactive heat source [$Watt/m^3$].

ExpDepthDependent(H_0=1e-6Watt/m^3, h_r=10e3m, z_0=0m)

Sets an exponential depth-dependent radioactive

\[ H_r = H_0 \exp \left( {- {(z - z_0) \over h_r}} \right)\]

where $H_0$ is the radioactive heat source [$Watt/m^3$] at $z=z_0$ which decays with depth over a characteristic distance $h_r$.