scholarly journals Low-background, digital gamma-ray spectrometer with BEGe detector and active shield: commissioning, optimisation and software development

2019 ◽  
Vol 322 (3) ◽  
pp. 1311-1321
Author(s):  
Krzysztof Gorzkiewicz ◽  
Jerzy Wojciech Mietelski ◽  
Renata Kierepko ◽  
Kamil Brudecki
Keyword(s):  
Gamma Ray ◽  
Germanium Detector ◽  
Low Background ◽  
Gamma Ray Spectrometer ◽  
Annihilation Peak ◽  
The Mean ◽  
Plastic Scintillators ◽  
Set Up ◽  
Active Shield ◽  
Broad Energy

Abstract This paper presents results of the development process of low-background, digital gamma-rays spectrometer equipped with Broad Energy Germanium detector (CANBERRA BE5030), multi-layer passive shield and cosmic veto system that consists of five plastic scintillators (SCIONIX EJ-200). Data acquisition is performed using digitizer CAEN DT5725 with CoMPASS software. Output data analysis is carried out with purposely written and developed code VETO. On the basis of conducted tests, acquisition parameters were set up and tuned as well as time delays between all detectors were established. As a result of the configuration process, the mean background counts reduction of 64% in the whole spectrum and 65% in annihilation peak were achieved. This procedure allowed diminishing detection limits of selected isotopes 37% on average.

scholarly journals Investigations of Muon Flux Variations Detected Using Veto Detectors of the Digital Gamma-rays Spectrometer

2021 ◽  
Vol 11 (17) ◽  
pp. 7916
Author(s):  
Krzysztof Gorzkiewicz ◽  
Jerzy W. Mietelski ◽  
Zbigniew Ustrnul ◽  
Piotr Homola ◽  
Renata Kierepko ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Germanium Detector ◽  
Cosmic Ray ◽  
Muon Flux ◽  
Flux Intensity ◽  
Flux Monitoring ◽  
Plastic Scintillators ◽  
Active Shield ◽  
Term Monitoring

This paper presents the results of cosmic ray muons flux monitoring registered by a digital gamma-ray spectrometer’s active shield made of five large plastic scintillators. In traditional, i.e., analogue active shields working in anticoincidence mode with germanium detectors, the generated data are used only as a gating signal and are not stored. However, thanks to digital acquisition applied in designed novel gamma-ray spectrometers enabling offline studies, it has not only become possible to use generated data to reduce the germanium detector background (cosmic rays veto system) but also to initialize long-term monitoring of the muon flux intensity. Furthermore, various analyses methods prove the relevance of the acquired data. Fourier analyses revealed the presence of daily (24 h), near-monthly (27 days) and over bi-monthly (68 days) cycles.

Astroparticle physics with a customized low-background Broad Energy Germanium detector

2010 ◽  
Author(s):  
P Finnerty ◽  
J I Collar ◽  
G K Giovanetti ◽  
R Henning ◽  
M G Marino ◽  
...  
Keyword(s):  
Germanium Detector ◽  
Astroparticle Physics ◽  
Low Background ◽  
Broad Energy

scholarly journals Assessing the Radiological Risks Associated with High Natural Radioactivity of Microgranitic Rocks: A Case Study in a Northeastern Desert of Egypt

2022 ◽  
Vol 19 (1) ◽  
pp. 473
Author(s):  
Neveen S. Abed ◽  
Mohamed Abdel Monsif ◽  
Hesham M. H. Zakaly ◽  
Hamdy A. Awad ◽  
Mahmoud M. Hessien ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Fuel Cycle ◽  
Radiological Hazard ◽  
United Nations Scientific Committee ◽  
Southeastern Part ◽  
Gamma Ray Spectrometer ◽  
Activity Concentrations ◽  
Radiological Hazards ◽  
The Mean

This study aimed to evaluate the radiological hazards of uranium (238U), thorium (232Th), and potassium (40K) in microgranitic rocks from the southeastern part of Wadi Baroud, a northeastern desert of Egypt. The activity concentrations of the measured radionuclides were determined by using a gamma-ray spectrometer (NaI-Tl-activated detector). The mean (238U), (232Th), and (40K) concentrations in the studied rocks were found to be 3680.3, 3635.2, and 822.76 Bq/kg, respectively. The contents in these rocks were elevated, reaching up to 6.3 wt%. This indicated the alkaline nature of these rocks. The high ratios of Th/U in the mineralized rocks could be related to late magmatic mineralization, suggesting the ascent of late magmatic fluids through weak planes such as faults and the contact of these rocks with older granites. The present data were higher than those of the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) guideline limits. All the radiological hazard results indicated high human health risks. This confirmed that this area is not radiologically safe, and care must be taken when working in this area. This study showed that the area under investigation had high U content suitable for uranium extraction that could be used in the nuclear fuel cycle.

The Simulation of Low-Background Gamma Spectrometer With Clover Detector

2013 ◽  
Author(s):  
Huilan Liu ◽  
Yushou Song ◽  
Zhaoyang Xie ◽  
Baodong Sun
Keyword(s):  
Nuclear Physics ◽  
High Performance ◽  
Gamma Ray ◽  
Germanium Detector ◽  
Gamma Detector ◽  
Gamma Spectrometer ◽  
Radiation Level ◽  
Low Background ◽  
Clover Detector ◽  
Main Detector

A low-background gamma spectrometer consists of a high-performance gamma detector and a low-background chamber. It is widely used to monitor the radiation level of the environment and to identify the species of the radiological source. It is especially important for the analysis of the nuclear accident. Usually a high purity Germanium detector (HPGe) is used as a gamma ray detector. In order to enhance the detecting accuracy and sensitivity, it is essential to improve the performance of the gamma detector. In recent years, a clover detector composed of four coaxial HPGe crystals appear and is widely utilized in nuclear physics experimental research. Because of the larger dimensions and segmented structure, it displays outstanding characteristics different from traditional HPGe detectors. With a clover detector as the main detector and the HPLBS1 chamber of ORTEC as the lead chamber, the low-background gamma spectrometer is simulated by the Monte Carlo toolkit GEANT4, where the interaction processes of gamma ray provided by the GEANT4 physics list is used. The detecting performance of the low-background gamma spectrometer such as detecting efficiency and peak-total ratio are given. The results indicate that low-background gamma spectrometer with a clover as the main detector has better characteristic than that with HPGe as a main detector traditionally.

scholarly journals The characteristics of a low background germanium gamma ray spectrometer at China JinPing underground laboratory

2014 ◽  
Vol 91 ◽  
pp. 165-170 ◽  
Author(s):  
Zhi Zeng ◽  
Yuhao Mi ◽  
Hao Ma ◽  
Jianping Cheng ◽  
Jian Su ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Underground Laboratory ◽  
Low Background ◽  
Gamma Ray Spectrometer

Application of a low-background gamma-ray spectrometer to the determination of

2000 ◽  
Vol 53 (1-2) ◽  
pp. 121-126 ◽  
Author(s):  
J.W Mietelski ◽  
W Męczyński
Keyword(s):  
Gamma Ray ◽  
Low Background ◽  
Gamma Ray Spectrometer

scholarly journals Hiroshima University low-background .GAMMA.-ray spectrometer.

RADIOISOTOPES ◽  
1985 ◽  
Vol 34 (12) ◽  
pp. 682-685
Author(s):  
Kiyoshi SHIZUMA ◽  
Kazuo IWATANI ◽  
Hiromi HASAI
Keyword(s):  
Gamma Ray ◽  
Low Background ◽  
Gamma Ray Spectrometer

Heat flow and surface radioactivity in the Quirke Lake Syncline near Elliot Lake, Ontario, Canada

1968 ◽  
Vol 5 (6) ◽  
pp. 1417-1428 ◽  
Author(s):  
J. H. Sass ◽  
P. G. Killeen ◽  
E. D. Mustonen
Keyword(s):  
Heat Flow ◽  
Heat Production ◽  
Gamma Ray ◽  
Average Rate ◽  
Structural Effects ◽  
Gamma Ray Spectrometer ◽  
A Value ◽  
The Mean ◽  
Data Yield ◽  
Ore Zones

Heat flow was measured in seven diamond-drilled holes, ranging in depth from 300 to 900 m, in the Quirke Lake Syncline (82° 30′ W, 46° 30′ N, mean elevation 370 m), Values for individual holes vary from 1.20 to 1.40 with a mean of 1.32 ± 0.02 μcal/cm2s, and no systematic variation was detected within the 50 km2 area studied. Radiometric measurements with a portable, three-channel, gamma-ray spectrometer show a downward concentration (stratigraphically) of Th, U, and K within the lower part of the syncline, with mean concentrations of 12.7 ppm, 3.3 ppm, and 1.9%, respectively. These data yield an average rate of heat production of 4.5 heat generation units (1 hgu = 10−13 cal/cm3s). Taking account of the ore zones, the mean heat production from the syncline is about 6 hgu. Corrections for structural effects and heat production from the ore result in a value of 1.2 for the regional heat flow. This is within the range of other shield values, although somewhat higher than the average for the Canadian Shield. The high value is readily explained if the observed mean surface radioactivity persists to a depth of 7 to 10 km.

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