Studying of characteristics of the HPGe detector for radioactivity measurements

Demir, Demet; Eroğlu, Murat; Turşucu, A.

doi:10.1088/1748-0221/8/10/p10027

Cited by 10 publications

(5 citation statements)

References 15 publications

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“…Although dealing with much higher energies than encountered in typical EDXRF systems, the simulations are of general use and would have value in optimising so-called graded collimation systems where XRF and Compton scatter from materials forming the collimator shield are signicant contributors to the system blank that should be minimised to yield the best detection limits. The spectroscopic characteristics of an HPGe detector were reported by Demir and colleagues, 94 who used four radioisotope sources to cover the extended energy range 13.8 to 1212 keV. The authors made measurements at four source-detector distances and presented a theoretical n efficiency model that matched the data, concluding, rather unsurprisingly, that the detector efficiency reduced with increasing gamma-ray energy.…”

Section: X-ray Detectorsmentioning

confidence: 92%

2014 Atomic Spectrometry Update – a review of advances in X-ray fluorescence spectrometry

West

Ellis

Potts

et al. 2014

J. Anal. At. Spectrom.

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Section: X-ray Detectorsmentioning

confidence: 92%

2014 Atomic Spectrometry Update – a review of advances in X-ray fluorescence spectrometry

West

Ellis

Potts

et al. 2014

J. Anal. At. Spectrom.

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“…The charge of a cluster should be proportional to the energy deposited by the incident radiation. From

-decay energy spectra in the literature there should be 5 prominent lines [ 21 , 22 ] at energies stated in Table 2 . The spectra presented here show four prominent peaks ( Figure 6 , first column), which will be discussed in detail in Section 5.1 .…”

Section: Discussionmentioning

confidence: 99%

Dosimetry and Calorimetry Performance of a Scientific CMOS Camera for Environmental Monitoring

Aguilar-Arevalo

Bertou

Canet

et al. 2020

Sensors

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This paper explores the prospect of CMOS devices to assay lead in drinking water, using calorimetry. Lead occurs together with traces of radioisotopes, e.g., 210Pb, producing g-emissions with energies ranging from 10 keV to several 100 keV when they decay; this range is detectable in silicon sensors. In this paper we test a CMOS camera (OXFORD INSTRUMENTS Neo 5.5) for its general performance as a detector of X-rays and low energy g-rays and assess its sensitivity relative to the World Health Organization upper limit on lead in drinking water. Energies from 6 keV to 60 keV are examined. The CMOS camera has a linear energy response over this range and its energy resolution is for the most part slightly better than 2%. The Neo sCMOS is not sensitive to X-rays with energies below ~10 keV. The smallest detectable rate is 40 ± 3 mHz, corresponding to an incident activity on the chip of 7 ± 4 Bq. The estimation of the incident activity sensitivity from the detected activity relies on geometric acceptance and the measured efficiency vs. energy. We report the efficiency measurement, which is 0.08(2)% (0.0011(2)%) at 26.3 keV (59.5 keV). Taking calorimetric information into account we measure a minimal detectable rate of 4 ± 1 mHz (1.5 ± 0.1 mHz) for 26.3 keV (59.5 keV) g-rays, which corresponds to an incident activity of 1.0 ± 0.6 Bq (57 ± 33 Bq). Toy Monte Carlo and Geant4 simulations agree with these results. These results show this CMOS sensor is well-suited as a g- and X-ray detector with sensitivity at the few to 100 ppb level for 210Pb in a sample.

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“…The characteristic electric field distribution inside the BEGe detector provides robust capability for distinguishing signal and background pulses [3]. The inherent property of the BEGe detector makes it a prime choice in the radiochemistry or radioassay laboratories to determine the radioactive concentration of natural and artificial radionuclides in the environment [4]. To analysis the environmental samples with low radioactive concentration, the sample containers are always carefully designed to choose the optimal geometrical structure that maximize the detector efficiency [5].…”

Section: Introductionmentioning

confidence: 99%

Optimization of cylindrical sample geometry in determining the radioactive activity of environmental soil samples by using a Broad Energy Germanium detector

Li¹,

Bai²,

Xu³

2015

J. Inst.

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This paper describes the optimization of the geometric parameters of cylindrical geometry to maximize the detection efficiency for given sample volumes with a BEGe detector. A Monte Carlo model was developed and the detector efficiencies were studied for different sample geometries. The optimal sample dimensions that maximize the detection efficiencies have been determined by changing the sample dimensions through consecutive studies. The results show that the maximal detection efficiency depends on the appropriate selection of sample dimensions for a given sample volume. For the cylindrical geometry, the maximal detection efficiency can be obtained with the average sample radius/sample height value of about 1.75 (1.61 ∼ 1.91) for the corresponding given sample volume ranging from 150 to 400 cm 3 . Further studies show that the optimal sample height for a fixed cylindrical radius strongly depends on the measuring photon energy, and simply increasing the sample height does not generate higher full-energy peak net count rate. At last, optimal sample dimensions for the cylindrical geometry are recommended for a given detector specification with different sample volumes and photon energies. KEYWORDS: Models and simulations; Gamma detectors (scintillators, CZT, HPG, HgI etc); Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc)

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Studying of characteristics of the HPGe detector for radioactivity measurements

Cited by 10 publications

References 15 publications

2014 Atomic Spectrometry Update – a review of advances in X-ray fluorescence spectrometry

2014 Atomic Spectrometry Update – a review of advances in X-ray fluorescence spectrometry

Dosimetry and Calorimetry Performance of a Scientific CMOS Camera for Environmental Monitoring

Optimization of cylindrical sample geometry in determining the radioactive activity of environmental soil samples by using a Broad Energy Germanium detector

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