Efficiency calibration in the lab

Detector: GEM1800 - 90 deg
Source: 133Ba_low
Distance: 167.5mm
Start time: 14:47:40 - 30.04.2021
Stop time:  15:50:12 - 30.04.2021

file name: e127b_run0011.lmd
avrg. rate: 310 Hz
dead-time:  3%

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.