measurement of 137Cs with YSO 
after matching the gains of the 
HighGain channels


YSO detector was inside the black box, outside the matrix. 
The source was placed in front of the YSO

First measurement
Start: 15:14
End: 16:55
RootFile: 171023_1655_137CsYSO.root

Second measurement (same conditions )
Start: 16:55
Run number: 070
End:   17:41
File:     171023_1655_137CsYSO_070.dlt
RootFile: 171023_1655_1741_137CsYSO_070.root

The 137Cs source is weak; the rate of the YSO detector was about 50Hz (without source is 10Hz).