CsI(Tl) Specially selected scintillation detector with SiPM readout. Crystal size 21.6*21.6*21.6 mm, Good resolution of 7.1%@662 keV measured using Atom Nano Pro electronics ans Cs137 point source installed in opposite to the SiPM side of crystal.
For best results use with 42.5 Volts bias. Excellent gain - at least 1 nC of charge per MeV of dissipated energy with 42.5 V bias voltage.

General scintillator properties:
ParameterUnitValue
Max. Emission Wavelengthnm550
Average Light Decay Timens900
Average Light Yieldphotons/MeV60000
Densityg/cm34.51
Effective atomic numberZ54
Crystal sizemm / cm310*10*30 / 3
Energy rangekeV10-3000 min.

Want to build a portable and very sensitive and high resolution gamma spectrometer - it's your chance!
Check out my other lots, I hope you will find something interesting!
Any questions or requirements for detectors and/or electronics? Feel free to contact me.