What is a scintillation detector used for?
Scintillation detectors are used for the determination of the high-energy part of the X-ray spectrum. In scintillation detectors the material of the detector is excited to luminescence (emission of visible or near-visible light photons) by the absorbed photons or particles.
What are the two most widely used scintillation phosphors?
Inorganic scintillation phosphors are usually crystals grown in high temperature furnaces. They include lithium iodide (LiI), sodium iodide (NaI), cesium iodide (CsI), and zinc sulfide (ZnS). The most widely used scintillation material is NaI(Tl) (thallium-doped sodium iodide).
What type of radiation can a scintillation detector detect?
Scintillation detectors emit photons of ultraviolet and visible light due to interaction of radiation emitted by radioactive materials. Solid scintillation had been used earlier in nuclear science for the detection of radiation.
How do NaI scintillation detectors work?
NaI(Tl) detectors The thallium-activated sodium iodide detector, or NaI(Tl) detector, responds to the gamma ray by producing a small flash of light, or a scintillation. The scintillation occurs when scintillator electrons, excited by the energy of the photon, return to their ground state.
What is the main detector of a Geiger counter?
The main objective of the Geiger counter is to detect beta particle and gamma-ray. The main construction of the counter depends upon the tube chamber that is filled by an inert gas. This gas will be highly conductive of electricity when a high energy particle is impacted on it.
How does a gamma camera work?
The gamma camera records the energy emissions from the radiotracer in your body and converts it into an image. The gamma camera itself does not emit any radiation. It has radiation detectors called gamma camera heads.
What is the difference between organic and inorganic scintillators?
Decay is slower for heavier particles. There are significant differences between inorganic (crystal) scintillators and organic (crystals, liquid, plastic) scintillators….3. Scintillation efficiency.
How does a Dynode work?
In a PMT, dynodes are electrodes in a vacuum tube that serve as an electron multiplier through SEE (see Figure 1). The dynodes are so arranged that the electric fields between them cause the electrons emitted by each dynode to strike the next with an energy of a few hundred eV.
What is NaI TL scintillation detector?
A NaI(Tl) scintillation counter is a radiation detector which uses the effect known as scintillation. Scintillation, which occurs in the NaI(Tl) crystal, is a flash of light produced in a transparent material by the passage of a particle (an electron, an alpha particle, an ion, or a high-energy photon).
What is Nal detector?
Sodium Iodide Detectors Of all available scintillators, NaI(Tl) is the most extensively used. The material has an unequalled high light output and an excellent match of the emission spectrum to the sensitivity of photomultiplier tubes, resulting in very good energy resolution detectors.