Lutetium Iodide - LuI3(Ce)

High Speed X-ray Imaging Using LuI_3:Ce

LuI₃:Ce, Cerium-doped Lutetium Iodide, is a high density, high effective Z microcolumnar scintillation screen for high speed imaging.  Due to the microcolumnar structure of LuI₃:Ce scintillator, the spatial resolution is 50 µm.  The scintillator exhibits extremely high brightness (115,000 photons/MeV) when in the form of a single crystal which translates to extremely bright microcolumnar scintillator screens as well.

Key Features

• Ideal solution for high-speed, low afterglow applications
• Typical size is 40 mm diameter, but is available in sizes up to 4″ × 4″
• Afterglow following excitation by a 40 kVp X-ray source is 0.00001% at 3 ms
• Decay time for LuI₃:Ce is 3.6 ns (40%) and 30 ns (60%)

Key Benefits

• LuI₃:Ce scintillator is especially useful in applications that require high speed
• Concentration of Ce-dopant can be tailored to adjust emission peak
• Direct deposition onto fiber optics, or glass substrates
• High spatial resolution, high brightness and high speed
• Resolution, efficiency, and physical dimensions can all be tailored

Properties

Light yield excited by 40 kVp source: 50% of a 15 µm thick GOS(Tb) screen
Peak emission for Ce doping and range: 500 nm (470 – 560 nm)
Afterglow: 0.00001% at 3 ms
Decay time: < 5 ns
Spatial resolution using CCD: 12 lp/mm
Density: 5.6 g/cm³
Effective Z: 59.7

LuI₃:Ce High-speed Scintillator

The high absorption efficiency, due to the Lu-content, means that this is especially suitable for hard X-ray applications. Under excitation by a lab-source at RMD at 40 kVp as shown in Figure 2 (left), the LuI₃:Ce exhibits extremely low afterglow of 0.00001% at 3 ms. Additionally, experiments performed at the Advanced Photon Source (APS) at Argonne National Laboratory reveal a fast component of the decay of only 3.6 ns (40%) with a ‘slow’ component of 30 ns (60%).

Spatial Resolution

The microcolumnar structure inherent to our LuI₃:Ce films is responsible for producing high spatial resolution.

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