is the absorber made by brass? why? https://github.com/DRCalo/HidraSim/blob/40fed50a2405ec55fd9647471df249988547a7d8/src/DREMTubesDetectorConstruction.cc#L225-L225
is the absorber made by brass? why?
HidraSim/src/DREMTubesDetectorConstruction.cc
Line 225 in 40fed50