Crystalline stilbene is an organic scintillator used for radiation detection and is well-suited for discrimination between fast neutrons and a gamma-ray background. A fast neutron is one with kinetic energy above approximately 1 MeV. Fast neutron counting, spectroscopy, and imaging have applications in medicine, research, defense, and homeland security.

Inrad Optics produces stilbene using a proprietary low-temperature solution growth technology. This method yields high-quality, low-stress, large form factor material. All stilbene crystal growth, fabrication, and polishing is performed at our Northvale, NJ facility, ensuring complete traceability and satisfaction with every single crystal.


  • Direct detection of fast neutrons
    • Stilbene is highly sensitive to fast neutrons, hence they do not need to be moderated to lower energies to be detected
    • Stilbene takes advantage of the low background of fast neutrons for low-noise measurements
    • Detection of unmoderated neutrons preserves information about neutron trajectories and energies
  • Excellent discrimination between neutrons and gamma rays
    • Facilitates counting fast neutrons without false positives from gamma rays
    • Permits use of lower energy thresholds than liquid scintillators
  • Safe and Easy to Handle and Transport
    • Solid, non-hygroscopic, not flammable, not hazardous
    • Unpackaged stilbene is stable
    • Avoids the transportation, storage, and handling concerns of many liquid organic scintillators

Since developing the process of growing high quality stilbene crystals in sizes suitable for commerical use, Inrad Optics has received numerous awards and recognitions from the photonics industry and from the larger scientific community:

2015 CLEO/Laser Focus World Innovation Award in the category of Optical Components

2015 SPIE Prism Award in the category of Materials & Coatings

2015 Popular Science “Best of What’s New” Award in the category of Security

2014 Tibbetts Award for excellence in SBIR



Standard Crystals

Inrad Optics supplies cylindrical stilbene crystals wrapped in PTFE tape and optically polished on one face with a protective fused silica window as standard products.

Crystals are available in diameters of 25.4 mm, 50.8 mm, 76.2 mm, and 101.6 mm.

Crystals can be sealed in aluminum housings with protective fused silica windows and are currently available in the following sizes:

Part Number Cylinder Diameter Cylinder Height
MT1330 25.4 mm 25.4 mm
MT1331 50.8 mm 50.8 mm

Custom Crystals

Inrad Optics can fabricate stilbene in sizes from 5 mm to 130 mm and in geometries including cylinders, cones, cubes, bars, and plates. Stilbene can be finished and housed to customer specifications.

Finishing and housing options:

  • Wrapped in PTFE tape
  • Polished face coupled to a protective fused silica optical window
  • Mounted in an aluminum housing
  • Crystallographic orientation indicated for anisotropy studies
  • Integrated in a PMT-coupled detector assembly

Contact This email address is being protected from spambots. You need JavaScript enabled to view it. for more information about stilbene crystal custom configurations.

Detector Assembly

Inrad Optics now integrates Scintinel™ stilbene crystals into a magnetic shielded housing with photomultiplier tube and associated electronics. Our neutron detector assemblies are designed for 25mm, 50mm, 75mm, and 125mm diameter crystals.

Crystals fabricated to standard or custom shapes
Integrated detector assembly with Photomultiplier

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Application Note  Handling Instructions  Scintinel™ Data Sheet  Detector Data Sheet