Efficiency calibration in the lab

Detector: GEM1800 - 90 deg
Source: 210Pb
Distance: 167.5mm
Start time: 13:08:35 - 30.04.2021
Stop time:  13:49:56 - 30.04.2021

file name: e127b_run0008.lmd
avrg. rate: 60Hz
dead-time:  1%

Now with blocking gate to get rid of multiple triggers.
Dead time determination using: adt/bdt

Threshold at ~10keV

We have some external noise on the signal.