Efficiency calibration in the lab

Detector: GEM1800 - 90 deg
Source: 210Pb
Distance: 167.5mm
Start time: 20:39:54 - 29.04.2021
Stop time:  08:43:58 - 30.04.2021

file name: e127b_run0003.lmd
avrg. rate: 70Hz
dead-time:  1%

Rate spikes every ~2-3 sec. Need to be checked!