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What is meant by the energy resolution of the spectrometer?
The energy resolution in elemental analysis using X-ray spectroscopy means the minimum energy (eV) of a spectral peak that can be resolved. Two peaks of a spectrum that are separated by about the full width at half maximum (FWHM) are distinguishable. The energy resolution depends on the types of detectors.
What is energy resolution of scintillation detector?
Energy resolution of scintillation detectors used in gamma-ray spectroscopy is often dictated by the number of cathode electrons in the associated photo-multiplier tube (PMT). This is particularly true for lower light yield, high refractive index scintillator materials.
Why is energy resolution important?
The energy resolution (Re) of a detector measures its ability to distinguish gamma-rays with close energies. The better the energy resolution, the better it can separate two adjacent energy peaks, which allows identifying different decays or radionuclides in the spectrum.
What is FWHM nuclear medicine?
Full Width at Half Maximum. (FWHM) The full width at half maximum is a parameter to characterize the width of a peak on a graph. In nuclear medicine, the FWHM is used to determinate the energy resolution of gamma camera systems.
How do you calculate FWHM energy resolution?
%Energy resolution = FWHM x 100 /photo peak Energy resolution is expressed as a percent of the FWHM of a specific energy. Most cameras have an energy resolution in the range of 11% to 13% FWHM at 140 KeV.
How does a scintillator work?
How Do Scintillators Work? Scintillators are a group of materials that luminesce when exposed to ionizing radiation. In layman's terms that means these materials emit light when they absorb particles or electromagnetic waves that create “free” electrons in the material.
What is NaI 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).
How is FWHM resolution calculated?
The bar phantom resolution can be calculated by dividing the FWHM by 1.75. This means a camera with a FWHM of 4.0 could resolve bars that are approximately 2.3mm wide, with 2.3mm spacing.
What does energy resolution mean?
Energy Resolution is the ability of the Detector to accurately determine the Energy of the Incoming Radiation. Since no camera system is perfect, no system is capable of determining precisely what energy photon struck the crystal.
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