scholarly journals Minimum periodic function test of HPGe Detector Using 152Eu Certified Reference Materials

Wahana Fisika ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 83-90
Author(s):  
Yogi Priasetyono ◽  
Wahyu Retno Prihatiningsih
Keyword(s):  
Periodic Function ◽  
Environmental Samples ◽  
Hpge Detector ◽  
Certified Reference Materials ◽  
Energy Calibration ◽  
Channel Changes ◽  
Function Test ◽  
Efficiency Control ◽  
Measurement Validation ◽  
The Eu

The purpose of this research is to determine a minimum of periodic function tests for measurement validation for environmental samples. In this paper, the EU 152 is used as a source for measuring energy calibration as well as efficiency. Control quality on energy calibration monitor channel changes in energy 121.78 keV. In addition to calibration, testing Minimum Detectable Activity on this system. Results from measurements are then validated using environmental samples.

scholarly journals Study on analyzing overlaped peaks using the Gold algorithm of unfolding

2016 ◽  
Vol 19 (2) ◽  
pp. 71-79
Author(s):  
Loan Thi Hong Truong ◽  
Hoa Phuc Long Cao ◽  
Phuong Dang Nguyen ◽  
My Thi Thao Dang ◽  
Huy Quang Ngo
Keyword(s):  
Gamma Spectrometry ◽  
Environmental Samples ◽  
Hpge Detector ◽  
Gamma Spectrum ◽  
Low Level ◽  
Continuum Region ◽  
Gamma Spectra

In this work, we initially applied the Gold unfolding algorithm to deconvolute continuum region in the gamma spectra and to analyze its overlaped peaks for the gamma spectrometry using HPGe detector. The results could be used to analyse overlaped peaks of low level gamma spectrum for environmental samples.

In-Situ Measurement of Artificial Nuclides in Seabed Sediments Based on Monte Carlo Simulations and an Underwater HPGe Detector

2019 ◽  
Vol 53 (3) ◽  
pp. 16-22
Author(s):  
Jinzhao Zhang ◽  
Hongzhi Li ◽  
Xianguo Tuo
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Energy Resolution ◽  
Hpge Detector ◽  
High Energy ◽  
In Situ Measurement ◽  
Energy Calibration ◽  
High Energy Resolution ◽  
Seabed Sediments

AbstractIn-situ measurement of marine sediment radioactivity does not destroy the stratification of radionuclides in the sediment. We develop a novel seabed sediment radioactive measurement technique using a High Purity Germanium (HPGe) detector. The overall measurement system is designed, and the detector energy calibration is performed. The efficiency is calculated based on Monte Carlo simulations using the MCNP5 code. We compared the efficiency and energy resolution with the NaI(Tl) detection through experiments. NaI(Tl) detection is incapable of identifying the 137Cs artificial nuclides in seabed sediments due to the energy resolution limit. Hence, underwater HPGe detection is utilized due to its high energy resolution, which enables the detection of artificial nuclides 137Cs. The proposed method is of great significance in evaluating marine radioactive pollution.

scholarly journals Gamma spectroscopy methodology for large amounts of environmental samples in Sweden 30 years after the Chernobyl accident

2020 ◽  
Vol 239 ◽  
pp. 25002
Author(s):  
Mattias Lantz ◽  
Erik Andersson-Sundén ◽  
Peter Andersson ◽  
Abigail Barker ◽  
Cecilia Gustavsson ◽  
...  
Keyword(s):  
Chernobyl Accident ◽  
Environmental Samples ◽  
Hpge Detector ◽  
Gamma Spectroscopy ◽  
Soil Samples ◽  
Biological Processes ◽  
Transfer Factors ◽  
Radon Daughters ◽  
Citizen Science Project ◽  
Swedish Citizen

In a Swedish citizen science project, more than 200 elementary school classes participated in collecting fungi, soil samples, and droppings from deer and wild boar, from all over Sweden. The samples have been sent to a laboratory at Uppsala University where they are being analyzed through gamma spectroscopy with a shielded HPGe detector. The main objective is to scan the samples for 137Cs from the Chernobyl accident and compare the data with measurements from 1986, but uptake of naturally occuring radionuclides like 40K and radon daughters will also be determined. Together with the soil samples, transfer factors will be derived, and correlations for these factors will be sought for different species of fungi and soil types. The potential for correlating the results with different biological processes will also be investigated, in part through the collected animal droppings. This is a work in progress where the present status of the experimental setup and methodology are presented. Issues with the initial approach for corrections are discussed and preliminary results are presented.

Determination of the HPGe detector efficiency in measurements of radioactivity in extended environmental samples

2017 ◽  
Vol 130 ◽  
pp. 34-42 ◽  
Author(s):  
Diango M. Montalván Olivares ◽  
M.V. Manso Guevara ◽  
Fermin G. Velasco
Keyword(s):  
Environmental Samples ◽  
Hpge Detector ◽  
Detector Efficiency

Reduction of False Positives in the Identification of Nuclides in Environmental Samples

2003 ◽  
Author(s):  
Susan E. Haywood
Keyword(s):  
Environmental Samples ◽  
Free Parameter ◽  
Gamma Ray ◽  
Large Range ◽  
False Positives ◽  
Energy Calibration ◽  
Average Error ◽  
Peak Activity ◽  
Analysis Method ◽  
Decay Products

Gamma-ray spectra containing peaks that are too close in energy for deconvolution to be done accurately are best analyzed by a library-based method. However, a library-based analysis done with a large library may result an unacceptable number of false positives being reported. A normal working library suitable for analyzing environmental samples containing unknown materials may have over 1000 peaks, many of which are too close for deconvolution to be done accurately. A program has been written that uses a library-based analysis method that reduces the reporting of false positives, while retaining the ability to identify isotopes accurately from a large range of possibilities. In addition, the peak area calculation has been improved by allowing the energy calibration to be a free parameter in the fit of individual multiplets. This peak area improvement can result in a change of activity of several percent for some nuclides. In some cases, shifting the multiplet position can reduce false positives by identifying a peak in the multiplet as an unknown rather than associating it with a nuclide. One spectrum showed a marked peak activity improvement when the calibration was allowed to shift even though the the average error in the original calibration was 0.08%. Results obtained from a study on the identification of uranium decay products are presented.

scholarly journals Using stochastic dynamic modelling to estimate the sensitivity of current and alternative surveillance program of Salmonella in conventional broiler production

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ofosuhene O. Apenteng ◽  
Mark E. Arnold ◽  
Håkan Vigre
Keyword(s):  
Environmental Samples ◽  
Dynamic Modelling ◽  
Dust Sample ◽  
Surveillance Program ◽  
Stochastic Dynamic ◽  
Test Sensitivity ◽  
Broiler Production ◽  
Broiler Flock ◽  
Eu Commission ◽  
The Eu

Abstract Since 2018, the EU commission has declared the Danish broiler industry to be Salmonella free. However, there is continuous Salmonella pressure from the environment, and a number of parent flocks and broiler flocks become infected annually. When a parent flock becomes infected, the infection can be transmitted vertically to the broiler flocks, before the parent flock is detected and destroyed, including the eggs at the hatchery. To address this issue, we developed stochastic dynamic modelling of transmission of Salmonella in parent flocks and combined that with the relation between flock prevalence and test sensitivity for environmental samples in the flock. Results suggested that after 10 and 100 infected hens were seeded, the likelihood of detecting an infected parent flock within the three first weeks after the infection was strongly influenced by the taking of five boot swabs (95% CI 70–100) instead of two (95% CI 40–100) or the supplementing of the two boot swabs by a dust sample (95% CI 43–100). Results suggest that the likelihood of detecting the broiler flock as infected in the program was estimated to at least 99% in broiler flock even if only one chicken was initially infected. These findings are of relevance for managing parent flocks and eggs at the hatchery in case of Salmonella infection in parent flocks in the Danish poultry.

scholarly journals Establishing adequate conditions for mercury determination in environmental samples by INAA

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Caroline Perez ◽  
Eliane Conceição Dos Santos ◽  
Mitiko Saiki
Keyword(s):  
Environmental Samples ◽  
Gamma Ray ◽  
Irradiation Time ◽  
Certified Reference Materials ◽  
Nuclear Research ◽  
Tree Bark ◽  
Good Precision ◽  
Experimental Conditions ◽  
Synthetic Standard ◽  
Adequate Method

Mercury (Hg) is a toxic element released into the environment mainly by anthropic activities. Consequently, the improvement for Hg determination in environmental samples is of great interest. Instrumental Neutron Activation Analysis (INAA) is considered an adequate method to determine several elements. However, Hg determination by INAA is often hampered by its volatility, which causes losses. The aim of this study was to establish adequate irradiation conditions for Hg determination in environmental samples by INAA. The following parameters were evaluated: irradiation time, container for irradiation and spectral gamma ray interferences. For the study, aliquots of certified reference materials (CRMs) and tree bark samples were irradiated together with Hg synthetic standard at the IEA-R1 nuclear research reactor. Gamma ray activities of 197Hg and 203Hg were measured in a spectrometer coupled to a HGe detector. Obtained results indicated that polyethylene capsules or envelopes can be used as container for sample irradiation and the Hg impurities in these containers were negligible. Irradiation time of one hour was adequate for Hg determination and in long irradiations of 8 h problems of spectral interference of 198Au and 75Se were observed. In addition, Hg loss during the irradiation of 1 h and after irradiation was not observed. Quality control of Hg results, obtained in the CRMs analyses using one hour of irradiation, indicated good precision and accuracy with HORRAT < 2 and |Z score| < 2. The experimental conditions established in this study were applied to tree bark samples. Detection limits in these analyses were between 0.14 and 1.9 µg g-1.

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