Random Number Seed

To set the random seed:

i:Ts/Seed = 1 # default is 1

To generate several statistically independent runs, give each run a different Ts/Seed. A typical solution to produce 10 independent runs would be to give starting seeds of 1 to 10. The allowed range is 0 to 2147483647 (the maximum 32 bit integer).

For more details see the discussion in the Geant4 Application Developer’s Guide.

We use the random engine called RanecuEngine and the seed given to TOPAS is passed to the engine through CLHEP::HepRandom::setTheSeed.