NaI(Tl) Scintillator (NaI(Tl) Scintillation Crystal)
Thallium-doped sodium iodide (NaI(Tl)) is one of the most widely used inorganic scintillation crystals. Doped with trace thallium as an activator, it features extremely high light yield (around 38,000 photons per MeV) and excellent detection efficiency for X-rays and gamma rays, with a maximum emission wavelength well matched to photomultiplier tubes. Though hygroscopic and requires hermetic packaging, it remains a preferred choice for gamma spectroscopy, nuclear medical imaging, security inspection and environmental radiation detection due to its reliable performance and low cost.
OST Photonics offers a full range of encapsulated NaI(Tl) scintillators, high-temperature NaI(Tl) scintillators and NaI(Tl) scintillation detectors, available in diverse designs and specifications to meet various application requirements.
Application
Gamma-ray spectroscopy and nuclear radiation environmental monitoring
SPECT medical imaging and industrial non-destructive flaw detection
Public security inspection and food/water nuclear pollution screening
Oil well logging and space high-energy radiation astronomical observation
Features
Extremely high light output and excellent gamma-ray detection efficiency
Good energy resolution matched with conventional photomultiplier tubes
Mature manufacturing process with low cost
Available in large sizes with customizable geometric specifications
Production and Supply Capability
Maximum Size: 1000mm x 1000mm x 200mm
Available items: NaI(Tl) encapsulated scintillator, high temperature NaI(Tl) encapsulated scintillator, NaI(Tl) scintillation detector
Different encapsulation designs: general cylindrical NaI(Tl) scintillator, rectangular NaI(Tl) scintillator, end-well type NaI(Tl) scintillator, side-well type NaI(Tl) scintillator, thin disk type NaI(Tl) scintillator (for low-energy and X-ray detection) and so on.
Typical size: 1″ diameter x 1″ thick, 2″ diameter x 2″ thick, 3″ diameter x 3″ thick, 5″ diameter X 5″ thick, 2″x4″x16″, 4″x4″x16″
Different encapsulation material options: metal shell(Aluminum, Stainless steel, Titanium alloy), optical output window(K9 glass window, Quartz window, Sapphire window), radiation entrance window(Beryllium entrance window, Aluminum entrance window).
High-Temperature NaI(Tl) Scintillators
For oil logging applications, NaI(TI) scintillator works underground, it must withstand high temperatures above 150℃, certain shock, and vibration. The high-temperature NaI(TI) scintillators are encapsulated from high-temperature forged NaI(Tl) polycrystals and special high-temperature resistant materials through reliable encapsulation technology. The working temperature range is from -30 ℃ to 175 ℃. It has excellent mechanical shock resistance, temperature shock resistance, and a long lifetime. The drilling NaI(Tl) scintillator can work at 175°C and 30g strong vibration.
Types | Logging while drilling | Conventional logging | ||
Purpose | Density while drilling | Natural gamma count while drilling | Conventional density | Natural gamma count |
Encapsulation | Sapphire output window + Titanium alloy shell + Hot-forged polycrystals | Sintering output window + Stainless steel shell + Hot-forged polycrystals | ||
Energy resolution (For 137Cs) (%) | PHR(25℃): ≤12 PHR(175℃): ≤16 | PHR(25℃): ≤15 | PHR(25℃): ≤12 | PHR(25℃): ≤15 |
Properties
Density [g/cm3] | 3.67 |
Melting point [K] | 924 |
Thermal expansion coefficient [C-1] | 47.4 x 10-6 |
Cleavage plane | <100> |
Hardness (Mho) | 2 |
Hygroscopic | Yes |
Wavelength of emission max. [nm] | 415 |
Refractive index @ emission max | 1.85 |
Primary decay time [ns] | 250 |
Light yield [photons/keVγ | 38 |
Temperature coefficient of light yield | 0.3%C-1 |