Efficiency calibration in the lab

Detector: GEM1800 - 90 deg
Source: 241Am_high
Distance: 167.5mm
Start time: 13:56:33 - 30.04.2021
Stop time:  14:28:53 - 30.04.2021

file name: e127b_run0009.lmd
avrg. rate: 600Hz
dead-time:  4%

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.