Efficiency calibration in the lab

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CAUTION! 
This is now GEM1800 @ 145deg distance
But still operated as Xray1 in DAQ
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Rate is increasing slowly, from ~70 to ~220 Hz in ~7 hours.
Also the threshold seems to be lower now.
Also possible source holder movement!
Resolution still good.
Take this run with care!

Detector: GEM1800 - 145 deg
Source: 210Pb
Distance: 305mm
Start time: 14:16:18 - 13.05.2021
Stop time:  21:09:12 - 13.05.2021

file name: e127b_run0038.lmd
avrg. rate: 70Hz > 220Hz!!!!
dead-time:  1%

Blocking gate 2.5 us in vulom.

Threshold < 10keV

The scale serial communication is off.