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 200 > 400 Hz, more noise coming in.
Also possible source holder movement!
Resolution still good.
Take this run with care!

Detector: GEM1800 - 145 deg
Source: 210Pb
Distance: 305mm
Start time: 21:22:00 - 13.05.2021
Stop time:  08:56:31 - 14.05.2021

file name: e127b_run0039.lmd
avrg. rate: 220Hz > 400Hz !!!!
dead-time:  3%

Blocking gate 2.5 us in vulom.

Threshold < 10keV

The scale serial communication is off.