NaIL Dual Detection Neutron-Gamma Scintillator

NaI(Tl) crystal containing Lithium

  • Up to 57% efficient for thermal neutrons
  • Similar gamma-ray performance as standard NaI(Tl)

NaIL is a game-changing scintillation material for gamma-ray and neutron dual detection. 6Li (95% enriched) co-doping introduces efficient thermal neutron detection to the most established gamma-ray scintillator while retaining the favorable scintillation properties of standard NaI(Tl).

Sodium Iodide crystal co-doped with Thallium and Lithium [NaI(Tl+Li)] a.k.a. NaILTM has the ability to detect Gamma radiation and Thermal Neutrons in a single crystal with exceptional PSD [FoM = 3.0].

An excellent solution for area monitoring or thermal neutron activation security application.

The use of low 6Li concentrations in NaIL and large thicknesses can achieve the same neutron detection capabilities as 3He or CLYC or CLLB detectors at a lower cost.

6Li (95% enriched) co-doping introduces efficient thermal neutron detection to the most established gamma-ray scintillator while retaining the favorable scintillation properties of standard NaI(Tl).  NaIL can provide large volume, single material detectors for both gammas and neutrons at a low price per volume. 

The Neutron Detection efficiency for NaIL crystals is tested with the crystal placed in a High-Density Polyethylene (HDPE) and a Cf-252 source.  Read the details in this whitepaper Neutron Detection Efficiency Testing.

Straightforward gamma and neutron separation
Neutrons and gamma rays are easily distinguished through pulse shape discrimination (PSD). With the addition of Li into the NaI matrix, gamma-ray scintillation pulses become longer than neutron reaction pulses. The effect is dramatic, and simple PSD techniques create complete separation.
NaIL gamma and neutron separation
Neutrons and gamma rays are easily distinguished through PSD
 
 

Specifications

Material Properties
Density [g/cm3] 3.66
Melting point [K] 924
Thermal expansion coefficient [C-1] 47.7 x 10-6
Cleavage plane <100>
Hardness (Mho) 2
Hygroscopic Yes
Wavelength of emission max. [nm] 419
Refractive index @ emission max 1.85
Primary decay time [ns]

240ns, 1.4us

230ns, 1.1us

Light yield [photons/keVγ 35
Temperature coefficient of light yield 0.3%C-1
Neutron Detection Capability Comparison

When considering neutron detection capability, often the metric A*ε is used. A is the detector area and ε is the probability of detecting an impinging thermal neutron. When price and gamma detection ability are factored in, NaIL often becomes the best solution.

Detector nth detection capability A*ε (cm2)
NaIL 50 Ø x 50mm [g/cm3] 13
NaIL 50 Ø x 100 mm 26
NaIL 50 Ø x100x400 mm3 [C-1] 216
3He Ø 13 x 50 mm, 8 atm 7
3He Ø 50 x 1830 mm, 2.9 atm 613
CLYC  50 Ø x 50 mm 20
CLLB  50 Ø x 50 mm 22

 

It's What's Inside that Counts!

Diane Fruehauf, Application and Technology Manager talks about the advantages of NaIL and CLLB dual detection scintillators

Document Resource

Data Sheets
Sodium-Iodide-Material-Data-Sheet.pdf

NaI(Tl) scintillation material

PDF | 215.54 KB
Sodium-Iodide-Material-Data-Sheet
Data Sheets
Efficiency-Calculations-Brochure.pdf

Efficiency Calculations for Selected Scintillators

PDF | 1.36 MB
Efficiency-Calculations-Brochure
Brochures
Scintillation-Materials-and-Assemblies.pdf

basic properties of our radiation detection products and the mechanical features of various standard and specialty designs

PDF | 6.27 MB
Scintillation-Materials-and-Assemblies