Calculations of an effective solid angle including self-absorption correction applied to gamma-ray spectrometry analysis of natural samples

1992 ◽  
Vol 71 (4) ◽  
pp. 434-440
Author(s):  
R. Fraczkiewicz ◽  
W. Walkowiak
Keyword(s):  
Gamma Ray ◽  
Solid Angle ◽  
Gamma Ray Spectrometry ◽  
Spectrometry Analysis ◽  
Absorption Correction ◽  
Effective Solid Angle

scholarly journals A gamma-ray spectrometry analysis software environment

2018 ◽  
Vol 134 ◽  
pp. 200-204 ◽  
Author(s):  
G. Lutter ◽  
M. Hult ◽  
G. Marissens ◽  
H. Stroh ◽  
F. Tzika
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Analysis Software ◽  
Software Environment ◽  
Spectrometry Analysis

Modeling detector response in airborne gamma‐ray spectrometry

Geophysics ◽  
1999 ◽  
Vol 64 (5) ◽  
pp. 1378-1392 ◽  
Author(s):  
Stephen Billings ◽  
Jens Hovgaard
Keyword(s):  
Count Rate ◽  
Gamma Ray ◽  
Solid Angle ◽  
Azimuthal Angle ◽  
Geometrical Model ◽  
Detector Response ◽  
Gamma Ray Spectrometry ◽  
Uniform Model ◽  
Detector Model ◽  
Peak Count

A geometrical detector model of airborne gamma‐ray spectrometry is presented for data acquired using a rectangular detector of arbitrary dimensions. The detector response is modeled by calculating variations in solid angle and detector thickness for sources at different orientations. This gives the total count rate, which is then multiplied by a factor, assumed independent of orientation, to give the peak count rate. The model shows excellent agreement with experimental data collected using a 4.2-liter detector and with Monte Carlo simulations of a 16.8-liter detector. Results for the 4.2-liter crystal showed significant asymmetry. However, for a typical airborne system, with a 16.8-liter crystal, the asymmetry was weak because the detector had about the same solid angle and thickness at any azimuthal angle. The point spread function for the geometrical detector model differed significantly from a uniform detector model, the latter predicting a lower spatial resolution. This implies that surveys designed on the uniform assumption may undersample the signal between flight lines. For example, at 60 m elevation, the area that contributes 90% of the thorium signal is predicted to be 10.9 hectares (ha) for the uniform model and only 7.6 ha for the geometrical model. The model can be extended to incorporate aircraft velocity by convolving the stationary model with a rectangular function. Aircraft velocity can have a substantial influence on the modeled response if long integration times permit significant displacement of sources relative to the height of the aircraft.

scholarly journals Assessment of contamination of natural and anthropogenic radionuclides in rice samples collected from Songkhla province, Thailand

2021 ◽  
Vol 2145 (1) ◽  
pp. 012019
Author(s):  
P Kessaratikoon ◽  
D Riyapunt ◽  
R Boonkrongcheep ◽  
N Changkit
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Department Stores ◽  
Anthropogenic Radionuclides ◽  
Lifetime Cancer Risk ◽  
Spectrometry Analysis ◽  
Rice Samples ◽  
Specific Activities ◽  
Analysis System ◽  
Set Up

Study on assessment of contamination of natural and artificial radionuclides in agricultural products samples are very important to all human being as a consumer. In the present study, we have measured and evaluated the specific activities of natural (40K, 226Ra and 232Th) and anthropogenic (137Cs) radionuclide in rice samples. The 30 rice samples were collected from general and department stores at Songkhla province in the south of Thailand. The high-purity germanium (HPGe) detector and gamma-ray spectrometry analysis system which was set-up in advanced laboratory in Thailand Institute of Nuclear Technology (public Organization) or TINT were employed to perform all of measurements and analysis for this study. The frequency distribution of specific activities of 40K, 226Ra, 232Th and 137Cs for this study were also studied and found to be asymmetrical distribution with the skewness of 1.29, 1.43, 2.32 and 0.82, respectively. For this reason, the median values of specific activities of 40K, 226Ra and 232Th which were 620.04 ± 44.30, 3.73 ±0.54 and 2.44 ±0.54 Bq/kg respectively, should be selected and also used to calculate some related radiological hazard indices in this study. Furthermore, the excess lifetime cancer risk (ELCR) would be also evaluated and presented. Moreover, the results of present study were taken to compare with some data and studies in Thailand and global measurement and calculations. It was found that the outcomes satisfied the standards of UNSCEAR and IAEA.

Gamma-Ray Spectrometric Analysis of Some Trace Elements in the Human Articular Disc of the Mandible

1963 ◽  
Vol 03 (02) ◽  
pp. 175-182 ◽  
Author(s):  
Bo Bergman ◽  
Rune Söremark
Keyword(s):  
Trace Elements ◽  
Neutron Activation ◽  
Quantitative Data ◽  
Thermal Neutron Flux ◽  
Gamma Ray ◽  
Dry Weight ◽  
Gamma Ray Spectrometry ◽  
Spectrometric Analysis ◽  
Articular Disc ◽  
Group Separation

SummaryBy means of neutron activation and gamma-ray spectrometry the concentrations in the human mandibular articular disc of the following elements have been determined: Na, Mn, Cu, Zn, Rb, Sr, Cd, W, and Au. The discs were obtained at necropsy from seven men and nine women, ranging in age from 56 to 71 years.The activation was carried out in a thermal neutron flux of about 1.7 XlO12 neutrons × cm−2 × sec.−1 for about 20 hours. A chemical group separationwas performed before the gamma-ray spectrometry. Quantitative data based on the dry weight of the cartilage samples were obtained by comparing the photo-peak area of the identified elements with those of appropriate standards.

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