Simultaneous measurement of Xray35 and Xray90. The dead-time is <3%

Detector: 35
Source: 133Ba - strong source
Distance: 334mm

Detector: 90
Source: Lead source
Distance: 167.5mm: the lead source was measured 3mm width with the source in the middle. Therefore, I set the paper zylinder to ~169mm distance. 

Start time: 22:25:22 23.03.2020
Stop time:  00:04:49 24.03.2020

file name: run115_xxxx.lmd
avrg. rate35: 75Hz
avrg. rate90: 55Hz
dead-time:  2%

Uwe reduced the noise on the 145 degree detector as well. 

During measurement the oscilloscope remained connected!