Test of individual 3He tubes

The tests were done using the ATOMKI MCA and
HV: ISEG NH204M
Preamp: Mesytec MHV-16 (Unipolar IFIC) 
Amp: ORTEC671 (Gain=5x0.5,SHP=6us)
Pulser: 10Hz-Clock + TC410A G&DG + BH-1 (tr=1us,tf=1ms,amp=0.7)
Spectra measured with 1024 channels
Counting time:   100s (UPC, RIKEN and ORNL 1")
                 120s (ORNL 2")
Neutron source:   252Cf
PE setup: 1 inches tubes were tested on the BELEN-20 PE matrix, while for 2 inches tubes a moderator was prepared 
using existing material (see attached figures). 

Attached a figure with a sample spectrum for each tube type
and a  compressed file with all the measured spectra in ASCII format.

All the tubes performed correctly. The neutron signal is well separated from the noise. 
The RIKEN tubes have the highest gain. Gain in the UPC tubes is the lowest.