Basic knowledge about gadolinium oxysulfide

The main use of gadolinium oxysulfide is in ceramic scintillator. Scintillators are used in radiation detectors for medical diagnostics. A scintillator is the primary radiation sensor that emits light when struck by high-energy photons. The final density of gadolinium oxysulfide-based ceramics is 99.7% to 99.99% of the theoretical density (7.32 g/cm3), and the average grain size ranges from 5 microns to 50 microns, depending on manufacturing process.

Two powder preparation routes have successfully synthesized gadolinium oxysulfide: Pr, Ce, F powder complexes for ceramic scintillator. These preparation routes are called the halide flux method and the sulfite precipitation method. The scintillation properties of gadolinium oxysulfide:Pr, Ce, F complexes indicate that this scintillator is promising for imaging applications. This scintillator has two major disadvantages; one is the hexagonal crystal structure, which emits optical translucency only at the photodiode, and low external light collection. Another disadvantage is the high X-ray damage to the sample.

Terbium-activated gadolinium oxysulfide is often used as a scintillator in X-ray imaging. It emits at wavelengths between 382-622 nm, but has a major emission peak at 545 nm. It is also used as a green phosphor in projection CRTs, but has the disadvantage of significantly reducing efficiency at higher temperatures. Variants include, for example, using praseodymium instead of terbium (CAS No. 68609-42-7, EINECS No. 271-826-9), or using a mixture of dysprosium and terbium for doping (CAS No. 68609-40-5, EINECS No. 271-824-8).

Gadolinium oxysulfide is a promising luminescent host material because of its high density (7.32 g/cm3) and high effective Gd atomic number. These properties result in a high probability of interaction with X-ray radiation. Because they have high reliability, low cost and high luminescence properties. The (Gd0.99, Pr0.01)2O2S submicron phosphor synthesized by the homogeneous precipitation method is expected to become a new green luminescent material used in the field of high-resolution digital X-ray imaging [3] The gadolinium oxysulfide powder phosphor is obtained Widely used in medical X-ray imaging to convert X-rays into visible light. Gadolinium oxysulfide: Pr-based solid-state X-ray detectors have successfully reintroduced X-ray sampling in medical computed tomography (by using any type of penetrating wave for slice or slice imaging).