Total Linear Stopping Power
The "Total Linear Stopping Power" is defined as the average energy loss of the particle per unit path length.
Applicable units are those of quantitykind:TotalLinearStoppingPower
http://en.wikipedia.org/wiki/Stopping_power_(particle_radiation)
https://cdd.iec.ch/cdd/iec61987/iec61987.nsf/ListsOfUnitsAllVersions/0112-2---62720%23UAD203
The "Total Linear Stopping Power" is defined as the average energy loss of the particle per unit path length.
$S = -\frac{dE}{dx}$, where $-dE$ is the energy decrement in the $x-direction$ along an elementary path with the length $dx$.
http://www.iso.org/iso/catalogue_detail?csnumber=31895