Estimation of soil characteristics based on the depth distributions of 238U, 232Th, 226Ra, 40K activity concentrations using laboratory HPGe gamma spectrometry

2018 ◽  
Vol 318 (3) ◽  
pp. 1931-1938 ◽  
Author(s):  
Truong Thi Hong Loan ◽  
Vu Ngoc Ba ◽  
Nguyen Quang Đao ◽  
Nguyen Ngoc Anh ◽  
Mai Thanh Man ◽  
...  
Keyword(s):  
Gamma Spectrometry ◽  
Soil Characteristics ◽  
Activity Concentrations ◽  
Hpge Gamma Spectrometry ◽  
Depth Distributions

Determination of anthropogenic contamination by 137Cs, 240Pu/239Pu and 235U/238U in lichens and mosses from Russian Arctic areas 

2021 ◽  
Author(s):  
Susanna Salminen-Paatero ◽  
Paul Dutheil ◽  
Timo Sundström ◽  
Ilia Rodushkin ◽  
Jussi Paatero
Keyword(s):  
Gamma Spectrometry ◽  
Russian Arctic ◽  
Anthropogenic Contamination ◽  
Terrestrial Environment ◽  
Arctic Regions ◽  
Franz Josef Land ◽  
Icp Ms ◽  
Nuclear Events ◽  
Hpge Gamma Spectrometry

<p>Lichen and moss samples were collected from Russian Arctic areas (Kola Peninsula, Franz Josef Land and few other locations) in the 1990s. In 2020, <sup>137</sup>Cs was determined by HPGe gamma spectrometry from these samples after which isotopes of Pu and U were radiochemically separated from the samples. Mass ratios <sup>240</sup>Pu/<sup>239</sup>Pu and <sup>235</sup>U/<sup>238</sup>U were determined by ICP-MS for utilizing the characteristic isotopic fingerprints of different nuclear events. The aim of the work was to survey radioactive contamination sources in terrestrial environment in Russian Arctic regions, which have not yet been completely explored in respect to anthropogenic isotopes and their origin in the environment.</p>

scholarly journals Thoron emanation and exhalation of Slovenian soils determined by a PIC detector-equipped radon monitor

Nukleonika ◽  
2016 ◽  
Vol 61 (3) ◽  
pp. 379-384 ◽  
Author(s):  
Jácint Jónás ◽  
Zoltán Sas ◽  
Janja Vaupotic ◽  
Erika Kocsis ◽  
János Somlai ◽  
...  
Keyword(s):  
Health Risk ◽  
Gamma Spectrometry ◽  
Half Life ◽  
Activity Concentration ◽  
Soil Samples ◽  
Radon Emanation ◽  
Decay Products ◽  
Radon Monitor ◽  
Hpge Gamma Spectrometry ◽  
Chamber Technique

Abstract The health risk from thoron (Rn-220) is usually ignored owing to its short half-life (55.6 s), but the generated thoron decay products can cause a significant dose contribution. In this study, altogether 51 Slovenian soil samples were investigated using an accumulation chamber technique to obtain information about thoron exhalation features. The obtained (massic) thoron exhalation results varied between 6.9 and 149 mBq·kg−1·s−1 (average: 55.2 mBq·kg−1·s−1). The Th-232 content was determined using HPGe gamma spectrometry. The Th-232 activity concentration ranged between 9.3 and 161.7 Bq·kg−1 (average: 64.6 Bq·kg−1). The thoron emanation features were also calculated from the obtained results (2.9 to 21.2% with an average of 8.6%). The thoron exhalation and emanation properties were compared with the radon exhalation and emanation features determined in a previous study. It was found that there was no correlation between the radon and thoron emanation features, according to the obtained data. This can be explained by the different Ra-224 and Ra-226 distributions in the soil grains. As a result, the thoron emanation factor cannot be predicted from radon emanation and vice versa.

scholarly journals Natural and artificial nuclides in Salesópolis reservoir

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Paulo Sergio Cardoso Silva ◽  
Renato Semmler ◽  
Guilherme Soares Zahn ◽  
Flávio Roberto Rocha ◽  
Sandra Rerina Damatto ◽  
...  
Keyword(s):  
Gamma Spectrometry ◽  
Counting Rate ◽  
Ground Level ◽  
Metropolitan Region ◽  
The North ◽  
Activity Concentrations ◽  
Nuclear Tests ◽  
Low Levels ◽  
Thorium Series

Natural radioactivity is ubiquitous in the environment mainly due to the presence of the nuclides from the uranium and thorium series and 40K. Although in the South Hemisphere nuclear tests have been fewer in number than that in the North, artificial radionuclides can also be found spread at ground level. In this study, the activity concentrations of natural nuclides from the uranium and thorium series, 40K and the artificial 137Cs were determined in a sediment core with 42 cm depth collected in the middle of the Salesópolis reservoir, located in the Metropolitan Region of São Paulo city (SPMR). The Usina Parque Rio Tietê reservoir belongs to the Alto do Tietê system for the capture, storage and treatment of water for SPMR. Therefore, the quality of the water and sediments of this dam is of great importance. The activity concentrations were measured by gamma spectrometry. Samples were measured and saved at regular intervals at a maximum of 160 000 seconds. The gross area were determined for each peak and plotted against time and the counting rate was obtained by the slope of the curve. Background and reference materials were also counted and treated in the same way. Results showed that 226Ra varied from 45 to 116 Bq kg-1; 228Ra, from 80 to 165 Bq kg-1; 40K, from 155 to 1 187 Bq kg-1 and 137Cs varied from 0.3 to 7 Bq kg-1. The methodology applied for determining low levels of 137Cs in sediment proved to be efficient and reproducible.

Full spectrum analysis with the non-negative least square constraint for laboratory HPGe gamma spectrometry

2019 ◽  
Vol 322 (2) ◽  
pp. 961-967 ◽  
Author(s):  
Mai Thanh Man ◽  
Vu Ngoc Ba ◽  
Dang Thi Thao My ◽  
Dang Nguyen Phuong ◽  
Truong Thi Hong Loan ◽  
...  
Keyword(s):  
Gamma Spectrometry ◽  
Spectrum Analysis ◽  
Least Square ◽  
Full Spectrum ◽  
Hpge Gamma Spectrometry

scholarly journals Heavy metals and radionuclides concentrations in mosses from the region of Northern Greece

2019 ◽  
Vol 26 ◽  
pp. 62
Author(s):  
Ch. Betsou ◽  
M. Frontasyeva ◽  
E. Tsakiri ◽  
J. Hansman ◽  
N. Kazakis ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Atmospheric Deposition ◽  
Gamma Spectrometry ◽  
Dry Deposition ◽  
Ground Surface ◽  
Northern Greece ◽  
Wet And Dry Deposition ◽  
Activity Concentrations ◽  
Moss Survey ◽  
European Moss Survey

Mosses can be used as biomonitors for investigating the atmospheric deposition of radionuclides and heavy metals. They receive most of their nutrients directly from wet and dry deposition. During the 2015/2016 European moss survey, ninety-five samples of Hypnum cupressiformeHedw. were collected in Northern Greece. They were analyzed to the content of heavy metals using INAA. The concentrations of 137Cs,40K, 7Be and 210Pb radionuclides were determined using gamma spectrometry. Differences have been observed in the activity concentrations between mosses collected from ground surface, rocks, branches and near roots. Finally, a high sampling density was achieved, providing information for the elemental and radionuclides deposition from the atmosphere to terrestrial systems over the region of Northern Greece.

scholarly journals Identification of TENORM in Zirconium Oxychloride with Gamma Spectrometry

2021 ◽  
Vol 2 (1) ◽  
pp. 61-67
Author(s):  
Kharistya Rozana ◽  
Devi Swasti Prabasiwi ◽  
Dewi Puspa Ariany
Keyword(s):  
Radiation Exposure ◽  
Gamma Spectrometry ◽  
Hpge Detector ◽  
Acid Leaching ◽  
Zirconium Oxychloride ◽  
Environmental Radioactivity ◽  
Gamma Spectrometer ◽  
Activity Concentrations ◽  
Measured Activity ◽  
Job Safety

Abstract: Gamma spectrometer used to determine the type and activity of gamma emitting radionuclides, such as the measurement of TENORM (Th-232, U-238, Ra-26 dan K-40) in the zirconium oxychloride or environmental radioactivity.  This research was carried out to know each the TENORM on the zirconium oxychloride (ZrOCl2.8H2O) which accommodation of environment data the radioactivity in draft job safety about the workers.  Zirconium oxychloride is a result of chloride acid leaching process from sodium zirconate, containing uranium and thorium, so that it has the potential for contamination and increase the radiation exposure.  The instrument used for counting by HPGe detector and the spectrum were analyzed further using software Genie 2000.  Mean measured activity concentrations (radioactivity) of U-238, Th-232, Ra-226 and K-40 respectively were 13,43±0,876 Bq/kg, 12,040±1,483 Bq/kg, 11,400±0,582 Bq/kg dan 32,940±3,270 Bq/kg.

Applying in-Situ and Laboratory-based Gamma Spectrometry to Determine Activity Concentration and Distribution of 40K, 226Ra and 232Th in Abeokuta, Southwest Nigeria

2021 ◽  
Vol 14 (4) ◽  
pp. 323-331
Keyword(s):  
Gamma Spectrometry ◽  
Activity Concentration ◽  
Risk Level ◽  
Primordial Radionuclides ◽  
Activity Concentrations ◽  
Nuclear Security ◽  
Southwest Nigeria ◽  
Average Activity ◽  
The City

Abstract: The applications of radionuclides are potential sources of health risk and also a concern in the area of nuclear security. It is therefore imperative to determine the presence of the different radionuclides present in the environment at all times, because it is necessary to control and assess the risk level in the environment. The present study compares activity concentrations of the primordial radionuclides 40K, 226Ra and 232Th obtained from laboratory gamma spectrometry measurements with the activity concentrations of the radionuclides as obtained from in-situ measurements. Soil samples were randomly collected from nineteen different points within Abeokuta city ensuring good coverage of the city area. A mobile gamma spectrometry system was used to collect gamma spectra measurements in the field. The obtained values are presented. The ranges of activity concentrations for 40K, 226Ra and 232Th have been found to be 113 – 1975, 5 – 128 and 181 – 3284 Bqkg-1, respectively for laboratory gamma spectrometry and 104 – 1312, 31 – 121 and 104 – 2578 Bqkg-1, respectively for in-situ gamma spectrometry measurements. This study showed that the average activity concentrations of the primordial radionuclides in Abeokuta were much higher than worldwide averages of 400, 35 and 30 Bqkg-1 for 40K, 226Ra and 232Th, respectively. From both methods, 232Th is seen to be the major contributor to the environmental radioactivity of Abeokuta. Good correlations also were deduced between the activity concentration results obtained from laboratory and in-situ gamma spectrometry, which therefore implies a significant relationship between the two methods used in the study. Keywords: In-situ gamma, Gamma spectrometry, Activity concentration, Radionuclides.

RADIOACTIVITY ASSESSMENT OF NATURAL RADIONUCLIDES AND 137CS IN COMMONLY CONSUMED FOODS

2021 ◽  
Author(s):  
Milena Živković ◽  
◽  
Dragoslav Nikezić ◽  
Tatjana Miladinović ◽  
Jelena Stajić ◽  
...  
Keyword(s):  
Gamma Spectrometry ◽  
Natural Radionuclides ◽  
Whole Body ◽  
Artificial Radioactivity ◽  
Activity Concentrations ◽  
Natural And Artificial Radioactivity

The goal of this research is to determine the levels of natural and artificial radioactivity in 13 different samples of commonly consumed foods from Serbian markets. A gamma spectrometry was used to measure the activity concentrations of 226Ra, 232Th, 40K, and 137Cs. The annual whole-body doses from 137Cs and natural radionuclides, due to the consumption of tea for an adult, are in the range of 2.3– 8.5 nSv for 137Cs, 14.1 – 21.7 nSv for 232Ra, 18.4 – 73.6 nSv for 232Th and for 40K 10.4 – 22.9 nSv. These doses are not harmful to the general public’s health.

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