GSI Forum - RDF feed https://forum.gsi.de/ Radiation length units https://forum.gsi.de/index.php?t=rview&goto=13440&th=3553#msg_13440
Can you tell me what units are used for radiation length in FairRadLenPoint?
When I do GetRadLength(), I get numbers up to 3000 * 10^(30)! I thought that units are cm instead of g/(cm^2), but even if I multiply it by density, which I get via GetDensity(), I get numbers up to 100*10^(15).

Artem Basalaev 2012-05-07T15:16:23-00:00
In case somebody else has such a problem:
Values of radiation length are in cm and they may be very high, because length of step is variable, that is, distance between ponts where radiation length is calculated is also variable. This distance is a length of homogeneous volume which particle passes along its track.

One may need not the radiation length itself, but the effective radiation length which is defined as length divided by radiation length. It's easy to get these values, since FairRadLenPoint has coordinates where the particle enters volume and where the particle leaves it.

TVector3 InOut=PosOut-PosIn;
Double_t Distance=InOut.Mag();