What is the resolution of a detector?
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.
Which detector has best energy resolution?
Planar detectors usually achieve the best energy resolution, because of their low capacitance; they are preferred for detailed spectroscopy, such as the analysis of the complex low-energy gamma-ray and x-ray spectra of uranium and plutonium.
How does a germanium detector work?
Germanium detectors have a p-i-n structure in which the intrinsic (i) region is sensitive to ionizing radiation, particularly X rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region.
How do you measure the resolution of an energy detector?
%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.
What is resolution of HPGe detector?
The detector has an energy resolution of 2.4 keV at 1.332 MeV (gamma ray from a 60Co) and a relative efficiency of 70% guaranteed in 1991.
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.
What is a high purity germanium detector?
Synopsis: High Purity Germanium (HPGe) is the only radiation detection technology that provides sufficient information to accurately and reliably identify radionuclides from their passive gamma ray emissions. HPGe detectors have a 20-30x improvement in resolution as compared to that of Sodium Iodide (NaI) detectors.
What determines the energy resolution?
It is a function of the light output, but it is also affected by the internal properties of the scintillator. The non-proportional response to numerous secondary γ and X-ray quanta as well as secondary electrons produced in the absorption process of γ–rays in the crystal all affect the energy resolution.
What is germanium detector?
Germanium detectors are semiconductor diodes having a p-i-n structure in which the intrinsic (i) region is sensitive to ionizing radiation, particularly x rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region.
Why are germanium detectors cooled?
Germanium detectors must be cooled to reduce this leakage current to the point where the associated noise does not degrade the energy resolution.
How does a germanium gamma-ray detector work?
Germanium detectors are semiconductor diodes having a p-i-n structure (P-type contact, intrinsic layer, and N-type contact), in which the intrinsic (i) region is sensitive to ionizing radiation, particularly x-rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region.
What is the energy resolution of a spectrometer?
energy resolution,spectrum resolution The resolution of the energy dispersive X-ray spectrometer (EDS) is defined for the peak of Mn Kα (5.9 keV) to be 125 to 140 eV. The resolution of the wavelength dispersive X-ray spectrometer (WDS) is defined for the peak of Fe Kα (6.4 keV) to be about 10 eV.
Germanium detectors are semiconductor diodes having a P-I-N structure in which the Intrinsic (I) region is sensitive to ionizing radiation, particularly X rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region.
What is a large volume germanium photon detector?
OBJECTIVES State of the art large-volume germanium photon detectors comprise a volume of high purity germanium, an n+hole blocking contact (lithium diffusion), a p+electron blocking contact (boron implant) and an intercontact surface.
Who are the authors of germanium detection and reliability?
IMPROVING GERMANIUM DETECTOR RESOLUTION AND RELIABILITY Author Gregory N. Martin, K. Michael Yocum, James F. Colaresi, and Harry S. Miley Created Date 8/22/2008 11:36:53 AM
Can film coating improve the reliability of germanium detectors?
A major reliability improvement would be realized if germanium detectors were made less sensitive to storage and operational environments by improving the film coating used to passivate and protect the intercontact surface. This research is the investigation of two surface film techniques for passivating HPGe detector surfaces.