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ThermalNeutron热中子探测碘化锂
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6LiI(Eu) thermal neutron scintillationdetectors

Thermal neutron detection via nuclearreaction :  

Since the Helium atom and the triton areboth particles with a limited range in the scintillator, a thermal neutroninteraction results in a peak in the pulse height spectrum.

Density

4,1 g/cc

Emission wavelength

440 nm

Effective decay time

1.4 µs (neutrons  and gammas)

High neutron peak position

> 3.6 MeV

Photoelectron yield

30-35 % of NaI(Tl)  

6-Li enrichment

>96%



LiI(Eu) crystal under daylight                  LiI(Eu) crystal under UV light

3 mm Lil(Eu) stops 90%of thermal neutrons 
Rugged crystal (> 20 degrees C temperature change perhour allowed) 
Excellent neutron / gamma discrimination (neutron peak > 3.6MeV) 
Neutron peak resolution < 7% FWHM (PMT readout)


Pulse height spectrum showingthe presence of the thermal neutron peak relative to the Cs-137 and Co-60 interactions.The thermal neutron peak is located at 4 MeV. The spectrum shows an excellentneutron / gamma separation.

LiI(Eu) detectors can be manufactured in manydifferent geometries. Since the decay time for neutrons is essentiallydifferent from other scintillation crystals, it is possible to combine LiI(Eu)crystals to other scintillators in phoswhich geometries. By means of digitalpulse shape discrimination techniques neutron and gamma interaction can beseparated.

Photodiode readout

It is possible to read out LiI(Eu) crystals using PINphotodiodes. Such a detector is rugged and is operated at low voltage. The sameproperties for PMT readout apply