What is the efficiency of the detector?
“Detection efficiency” is defined as the ratio of the output signals to incident electrons, X-rays or photons to a detector (input signals). A detector with high detection efficiency meets various requirements, such as high conversion efficiency from input to output, short dead time, and low noise.
What is the efficiency of a radiation detector?
For a given detector, efficiency values depend on the type and energy of the incident radiation. For incident charged particles such as alpha particles or beta particles, many detectors have a total efficiency that is close to 100 percent.
How do you calculate the efficiency of a detector?
the efficiency of the detector for radiation from the sample must be calculated using formula ε(E) = ω ε0(E), finding the value of the coefficient ω for the relation (2). For a cylindrical container l = H and for a complex-shaped container l = H – h.
Why does an HPGe detector have such good energy resolution?
F is the fano factor. w is the energy required to produce an electron-hole pair. In case of germanium w (≈3 eV) is low and thus a large number of electron-hole pairs are produced which results in good statistics from the charge collection and therefore a good energy resolution.
What is geometric efficiency?
Geometric efficiency is defined as the number of radiation quanta (particles or photons) incident on the detector in a given interval divided by the number emitted by the radiation source in the same interval.
What is absolute efficiency?
The absolute efficiency is the ratio of the measured count rate within the peak to the gamma ray emission rate of the source. eabs = Number of pulses recorded. Number of radiation quanta emitted by source. dependent on detector properties and details of counting geometry.
What is efficiency of GM tube?
The efficiency of detection of a G–M tube varies with the type of incident radiation. Tubes with thin end windows have very high efficiencies (can be nearly 100%) for high energy beta, though this drops off as the beta energy decreases due to attenuation by the window material.
What is HPGe?
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.
Why is HPGe better than NaI detector?
The HPGe detector offers less detection efficiency compared to the NaI (Tl) detector. It means that, HPGe is efficient in detecting nuclides with lower energy but not nuclides at higher energy. Na(TI) detector is a more efficient detector compared to HPGe detector although it has a very poor resolution.
How does a HPGe detector work?
Ionizing radiation enters the sensitive volume (germanium crystal) of the detector and interacts with the semiconductor material. High-energy photon passing through the detector ionizes the atoms of semiconductor, producing the electron-hole pairs.
How does a high purity germanium detector work?
What is the efficiency curve of a HPGe detector?
Figure 1: Typical efficiency curve of a HPGe detector, obtained on Genie™ 2K software. The efficiency stated by the manufacturers of HPGe detectors is a relative efficiency, obtained by the ratio between the absolute full-energy peak efficiency (for the 1.33 MeV
What is the efficiency of high-purity germanium detectors (HPGe)?
ABSTRACT High-purity germanium detectors (HPGe) are mandatory tools for spectrometry because of their excellent energy resolution. The efficiency of such detectors, quoted in the list of specifications by the manufacturer, frequently refers to the relative full-energy peak efficiency, related to the absolute full-energy peak efficiency of
What affects the photopeak efficiency of HPGe detectors in close geometry?
The study considers how various parameters such as (1) coincidence summing, (2) volume, (3) atomic number (Z) and (4) density, affects the absolute photopeak efficiency of the ERL’s HPGe detector in a close geometry (Marinelli beaker) for soil, sand, KCl and liquid samples.
What is the peak efficiency of the detector?
The efficiency of such detectors, quoted in the list of specifications by the manufacturer, frequently refers to the relative full-energy peak efficiency, related to the absolute full-energy peak efficiency of a 7.6 cm x 7.6 cm (diameter x height) NaI(Tl) crystal, based on the 1.33 MeV peak of a 60Co source positioned