Lithium Glass Scintillators

Cerium activated lithium silicate glass scintillators have been used for a variety of radiation detection applications since their development in the late 1950’s. The most common application is neutron detection since the glasses are often enriched in Lithium-6

  • Neutron spectrometry
  • Neutron radiography
  • Oil and gas exploration
  • Alpha, beta and gamma detection in extreme environments

Glass scintillators are divided into three types based on the percentage (by weight) of lithium content. In each type, the lithium is present in its natural isotopic ratio, enriched in 6Li to 95%, or depleted in 6Li (99.99% 7Li). The properties of the different glasses within each type are similar except for neutron sensitivity.

 

All of the glasses are formulated to have extremely low backgrounds (less than 20 dpm/100g of alpha activity) making it no longer necessary to order special types having this property.

Specifications
Properties
  GS2 GS20* KG2
Density [g/cm3] 2.64 2.5 2.42
Coefficient of linear expansion/°C 7.0x10-6 9.23x10-6 100 x 10-6
Light output relative to anthracene+ 22-34% 20-30% 20%
Decay times++, neutron excitation, ns none 18, 57 & 98 18, 62 & 93
Decay times++, alpha excitation, ns 20, 48 & 88 16, 49 & 78 15, 45 & 56
Decay times++, beta excitation, ns 19, 57 & 103 20, 58 & 105 17, 51 & 96
Alpha/beta ratio   0.23  
Wavelength of emission max [nm] 395 395 395
Refractive index at emission maximum 1.58 1.55 1.566
Resolution on the thermal neutron “peak” obtained with moderated Po/Be neutrons 13~22% 15~28% 20~30%
Peak/through ratio of above “peak” (range) 15:1 ~ 40:1 10:1 ~ 40:1 10:1 ~20:1

+Determined by thickness, increasing with decreasing thickness down to approximately 2mm

++Fast component, slow component and 90-10% respectively.

* GS20 is a registered trademark of Scintacor Ltd.

 

Packaging

Complete scintillation detector assemblies are designed to your specifications.
Note: bare glass scintillator is not distributed by Saint-Gobain

Typical Sizes

The most common forms produced are discs, cylinders or rectangles. Standard flat dimensions range from 10 to 200mm and thicknesses from 1 to 50mm. These dimensions can be combined to produce cylinders, discs or rectangular plates having maximum weights of about 280 grams.

Complete scintillation detector assemblies are designed to your specifications. Note: bare glass scintillator is not distributed by Saint-Gobain

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
Data Sheets
Efficiency-Calculations-Brochure.pdf

Efficiency Calculations for Selected Scintillators

PDF | 1.36 MB
Efficiency-Calculations-Brochure