Investigating the minimum detectable activity concentration and contributing factors in airborne gamma-ray spectrometry

2021 ◽  
Vol 32 (10) ◽  
Author(s):  
Yi Gu ◽  
Kun Sun ◽  
Liang-Quan Ge ◽  
Yuan-Dong Li ◽  
Qing-Xian Zhang ◽  
...  
Keyword(s):  
Activity Concentration ◽  
Gamma Ray ◽  
Minimum Detectable Activity ◽  
Gamma Ray Spectrometry ◽  
Contributing Factors ◽  
Detectable Activity

scholarly journals Study of the minimum detectable activity in gamma-ray spectrometry with various shielding configurations

2017 ◽  
Vol 1 (T4) ◽  
pp. 56-62
Author(s):  
Vuong Quang Le ◽  
Nguyen Hoang Vo ◽  
Chuong Dinh Huynh ◽  
Phuc Minh Lau ◽  
Thanh Thien Tran ◽  
...  
Keyword(s):  
Environmental Samples ◽  
Gamma Ray ◽  
Background Radiation ◽  
Environmental Radioactivity ◽  
Minimum Detectable Activity ◽  
The Other ◽  
Gamma Ray Spectrometry ◽  
Gamma Spectrometer ◽  
Detectable Activity ◽  
Gamma Ray Spectrometer

In the environmental radioactivity analyzing methods using gamma-ray spectrometry, the natural activities of radionuclides were required to be higher than the minimum detectable activity (MDA). To reduce MDA, one of the popular methods is to improve the ability of reducing the background radiation of the gamma-ray spectrometry. In this work, we designed the shielding configuration with 5 cm lead and 2 mm copper (thickness of walls and top). The MDAs of gamma-ray spectrometer were 2.6–4.24 times times for 40K (1460.8 keV), 232Th (208Tl- 2614.5 keV) and 238U (214Pb- 352 keV; 214Bi- 609.3 keV, 214Bi- 1764.5 keV). In the other hand, MDA for 238U with this shielding configuration is smaller than the activity of 238U inside surface soils in Vietnam. These results showed that the gamma spectrometer with NaI(Tl) detector and this shielding configuration was suitable for measurements activity of 238U in the environmental samples.

scholarly journals Determination of the activity concentration levels of the artificial radionuclide137Cs in soil samples collected from Qatar using high-resolution gamma-ray spectrometry

2016 ◽  
Vol 44 ◽  
pp. 1660237
Author(s):  
Huda Al-Sulaiti ◽  
Tabassum Nasir ◽  
K. S. Al Mugren ◽  
N. Alkhomashi ◽  
N. Al-Dahan ◽  
...  
Keyword(s):  
High Resolution ◽  
Nuclear Power ◽  
Activity Concentration ◽  
Gamma Ray ◽  
Germanium Detector ◽  
Soil Samples ◽  
Gamma Ray Spectrometry ◽  
Activity Concentrations ◽  
High Resolution Gamma

The goal of this study was to establish the first baseline measurements for radioactivity concentration of the artificial radionuclide [Formula: see text]Cs in soil samples collected from the Qatarian peninsula. The work focused on the determination of the activity concentrations levels of man-made radiation in 129 soil samples collected across the landscape of the State of Qatar. All the samples were collected before the most recent accident in Japan, “the 2011 Fukushima Dai-ichi nuclear power plant accident”. The activity concentrations have been measured via high-resolution gamma-ray spectrometry using a hyper-pure germanium detector situated in a low-background environment with a copper inner-plated passive lead shield. A radiological map showing the activity concentrations of [Formula: see text]Cs is presented in this work. The concentration was[Formula: see text]found to range from 0.21 to 15.41 Bq/kg. The highest activity concentration of [Formula: see text]Cs was observed in sample no. 26 in North of Qatar. The mean value was found to be around 2.15 ± 0.27 Bq/kg. These values lie within the expected range relative to the countries in the region. It is expected that this contamination is mainly due to the Chernobyl accident on 26 April 1986, but this conclusion cannot be confirmed because of the lack of data before this accident.

scholarly journals Distribution of 137Cs and 40K in the tissue of silver fir trees (Abies alba Mill.) from Lika (Croatia)

2021 ◽  
Vol 145 (7-8) ◽  
pp. 323-335
Author(s):  
Marina Popijač
Keyword(s):  
Forest Ecosystems ◽  
Activity Concentration ◽  
Gamma Ray ◽  
Atmospheric Transport ◽  
Physiological Activity ◽  
Abies Alba ◽  
Gamma Ray Spectrometry ◽  
Plant Tissues ◽  
Silver Fir ◽  
Growth Rings

The research on activities of <sup>137</sup>Cs and <sup>40</sup>K, which was conducted on the silver fir (Abies alba Mill.) from Lika has included sampling of the trees in the field (rings of the bole from three different heights separated into bark, growth rings, roots, needles, shoots, and the soil surrounding the cut down trees), laboratory analysis of samples using the gamma-ray spectrometry and the statistical analysis of the collected data. The radial and vertical distribution of cesium (<sup>137</sup>Cs) in trees was investigated. <sup>137</sup>Cs has contaminated forest ecosystems by remote atmospheric transport and radioactive precipitation as a result of nuclear test including the nuclear accident in Chernobyl. On a longer time scale, the variability of the <sup>137</sup>Cs distribution determined in the organisms of the silver fir depended on the half-life, while the seasonal dynamics were influenced by the degree of physiological activity and the characteristics and functions of plant tissues. The highest activity of <sup>137</sup>Cs was determined in the bark and the physiologically most active parts of the silver fir (shoots and needles). The highest activity concentration of the <sup>137</sup>Cs in the growth rings was measured in the lowest parts of the silver fir trees. This research contributed to understanding the behavior of <sup>137</sup>Cs, which entered the organisms of dominant tree species in the forest ecosystem, as well as its distribution in time and space.

scholarly journals Aktivitas NORM pada Sedimen Dasar di Perairan PLTU Tanjung Jati Jepara dan Kaitannya dengan Ukuran Butir Sedimen serta TOC

EKSPLORIUM ◽  
2019 ◽  
Vol 40 (2) ◽  
pp. 115
Author(s):  
Navila Bidasari Alviandini ◽  
Muslim Muslim ◽  
Wahyu Retno Prihatiningsih ◽  
Sri Yulina Wulandari
Keyword(s):  
Fly Ash ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Bottom Sediments ◽  
Activity Concentration ◽  
Gamma Ray ◽  
Bottom Ash ◽  
Radioactive Material ◽  
Gamma Ray Spectrometry ◽  
Purposive Sampling

ABSTRAKNORM (Naturally Occuring Radioactive Material) merupakan unsur radionuklida yang secara alami sudah ada dalam bumi dan kandungannya dapat meningkat dengan adanya kegiatan industri, seperti PLTU. Kegiatan PLTU menghasilkan bottom ash dan fly ash yang akan terbawa oleh angin kemudian masuk ke perairan dan mengendap pada sedimen dasar perairan. Penelitian ini bertujuan untuk mengetahui aktivitas NORM pada sedimen dasar terkait kegiatan PLTU Tanjung Jati, Jepara dan hubungannya dengan ukuran butir serta TOC (Total Organic Carbon). Pengambilan sampel dilakukan dengan metode purposive sampling. Pengukuran konsentrasi aktivitas NORM dilakukan menggunakan spektrometri sinar gama detektor HPGe, di Laboratorium Radioekologi Kelautan PTKMR-BATAN. Konsentrasi aktivitas NORM yang terdeteksi yaitu 40K berkisar 442,75–818,40 Bq.Kg-1, 232Th berkisar 99,19–212,34 Bq.Kg-1 dan 226Ra berkisar 42,42–77,77 Bq.Kg-1. Aktivitas NORM menunjukkan adanya hubungan dengan tekstur sedimen, tetapi tidak menunjukkan hubungan dengan kandungan Total Organic Carbon (TOC).ABSTRACTNORM (Naturally Occurring Radioactive Material) is a radionuclide element which naturally exists in the earth and its content can increased with the presence of industrial activities, such as the PLTU. The PLTU activities produce fly ash and bottom ash which will be carried away by the wind and then fall in the waters and settle on the bottom sediments of the waters. This study was aimed to determine the activity of NORM in bottom sediments related activities PLTU Tanjung Jati Jepara and its relationship with grain size and TOC (Total Organic Carbon). Sampling was conducted by purposive sampling method. NORM activity concentration measurements performed using gamma ray spectrometry HPGe detector, in Marine Radioecology Laboratory PTKMR-BATAN. NORM activity concentration detected is 40K ranged 442.75 to 818.40 Bq.Kg-1, 232Th ranged 99.19 to 212.34 Bq.Kg-1 and 226Ra ranged 42.42 to 77.77 Bq.Kg-1. NORM activity shows the relationship with sediment texture, but does not show a relationship with the composition of Total Organic Carbon (TOC).

scholarly journals Assessment of Activity Concentration of Radionuclides in Soil and Cassava Food Crop from Solid Mineral Mining Site in Ishiagu, Ivo L.G.A of Ebonyi State, Nigeria

2021 ◽  
pp. 1-13
Author(s):  
C. Mgbeokwere ◽  
C. P. Ononugbo ◽  
A. Bubu
Keyword(s):  
Activity Concentration ◽  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Measuring Instruments ◽  
Mining Sites ◽  
Mineral Mining ◽  
Effective Doses ◽  
Radiological Health ◽  
Risk Parameters ◽  
Cassava Crop

The assessment of activity of concentration of radionuclides in soil and food crops from solid mineral mining sites at Ishiagu, in Ivo L.G.A of Ebonyi State was carried out using the necessary measuring instruments. Samples of soil and cassava crop collected from around the mining sites. The samples were analysed using gamma ray spectrometry. The average activity concentration of 226Ra, 232Th and 40K in soil samples were 12.37,16.08, and 144.29 Bqkg-1 while those for cassava were 2.81, 16.80, and 205.41 Bqkg-1. The soil/plant radionuclide transfer ratio estimated are 0.62, 2.43 and 2.51 for 226Ra, 232Th and 40K, respectively. All the radiological risk parameters estimated are relatively low. The result of this work showed that the obtained results for all samples were lower than the international accepted limit. Hence, from radiological health standpoint, the obtained values of effective doses may not pose significant threat to both human and the environment. 

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