070 e01 d82 a15 809 005 8cb e65 c30 e85 034 aeb a70 5f0 c87 1f0 f26 8ed 886 6ab 47f b6a d4f 3c0 946 e87 4cf 377 6e2 327 9cc 833 ac5 6f8 5c4 e19 e74 7c0 991 ecc 40b 026 015 9fc 5db 97a 0a3 2ba b47 2cc 315 639 265 19b 908 63d 9ac fb7 47a 4c2 73b 8e4 c37 0cd 376 f31 1ac bb7 846 816 541 353 a38 a4d 630 ccd d48 32e 860 48e 7a3 9c4 aa4 d7b 2af 252 7ab 974 b76 24f 0bc f89 eaa bff 5f3 b19 8c9 350 972 b11
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.
About Author
