saturated cross section; limiting cross section

The maximum observable cross section.

NOTE On many softer devices, the saturated [limiting] cross section appears as the asymptotic upper section of the linear-energy-transfer (LET) vs cross-section curve. An additional increase in LET will not increase the cross section of the device. On harder devices, the cross section may not reach saturation.

References: 

JESD57, 12/96