scholarly journals Determination of correction factor of self-absorption for lead-210 in environment samples using spike method

2021 ◽  
Vol 234 ◽  
pp. 00051 ◽  
Author(s):  
Jawaher Al-Tuweity ◽  
Hassan Kamleh ◽  
M. Said Al-Masri ◽  
A.Wael Doubal ◽  
Azougagh Mohamed ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Gamma Spectroscopy ◽  
Atomic Energy Commission ◽  
Low Energy ◽  
Influential Factor ◽  
Correction Factors ◽  
Sediment Samples ◽  
Absorption Correction ◽  
Density Factor ◽  
Lead 210

In environment radiation measurement, calculation the correction factors are critical, especially for low energy measurement because of self-absorption phenomena. In this work the main purpose is to determination the self-absorption correction factors of lead-210 (210Pb) energy (46.5keV) in various environment samples (7 sediments, 5 soil) using an experimental method called Spike Method. The samples were collecting from different places in Syrian. They were prepared according to the laboratory producers starting from collecting, cleaning, drying, grounding, hemogenic and calculating the appearance density. Low-energy gamma spectroscopy HPGe was used for radiation analysis which available at the laboratories of the Protection and Safety Department - Syrian Atomic Energy Commission – Syria. The spike method depends on adding a quantity of a standard solution with a known activity which contains lead isotope 210Pb and added to the studied samples. Self-absorption correction factors (CF) calculated by the ratio of the count rate or activity of spiked and unspiked samples. The CF for sediment samples were between 29% to 54% and for soil samples, the CFs were between 38% to 56% recording correction higher than sediment samples. The results showed a relatively high self-absorption and CFs values because of the chemical composition changeable between the spiked and unspiked samples. For that, it is better to adopt other methods less expensive, give results faster, higher accuracy and do not make change in the chemical composition. The results were also showed the density factor is the most influential factor in self-absorption phenomena.

scholarly journals Self-absorption Correction Factors: Applying A Simplified Method to Analysis of Lead-210 in Different Environment Samples by Direct Counting of Low-energy Using HPGe Detector

2021 ◽  
Vol 240 ◽  
pp. 03002
Author(s):  
Jawaher Al-Tuweity ◽  
Hassan Kamleh ◽  
M. Said Al-Masri ◽  
A. Wael Doubal ◽  
El Mahjoub Chakir
Keyword(s):  
Chemical Composition ◽  
Gamma Spectroscopy ◽  
Direct Analysis ◽  
The Self ◽  
Correction Factors ◽  
Plant Samples ◽  
Absorption Correction ◽  
Density Factor ◽  
The Difference ◽  
Lead 210

This study aimed to determine the self-absorption correction factors of lead-210 (210Pb) in various Syrian environment samples. Seven sediments, five soils, and four plant samples were analysed by Gamma Spectroscopy using simple and direct analysis method called Cutshall. The method is based on measuring the penetration of gamma which emitted from a standard source, prepared in the laboratory by deposition of QCYB40 Standard Solution on stainless steel disk. The source was placed on top of the studied sample and the reference air sample during the measurement. The purpose was to study the self-absorption inside each sample by calculation of its self-absorption factors without knowing its chemical composition. The self-absorption correction results for the sediment samples SE3, SE6 and SE8 ranged between 36% and 45%, and 34% to 42% for the soil samples S5 and S1, respectively. Also, for the four plant samples, it recorded variance range from 4% to 18%. This is due to the difference in the density of the G4 sample, which appeared to be very low. However, the self-absorption correction factors CF were set for the different environmental samples, and the results show that the density factor of the sample is not the only influent factor in the CF values for low energies measurement, the sample chemical composition (sample matrix) is also more effective in addition to the samples’ particle sizes.

Development of a New Method to Reduce the Measurement Uncertainties in Gamma-Ray Spectroscopy of Bituminized Radioactive Waste Drums

2001 ◽  
Author(s):  
Bertrand Perot ◽  
Jean-Luc Artaud ◽  
Bernard Chabalier ◽  
Pierre Bonifay ◽  
Sébastien Bernard ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Chemical Composition ◽  
Radioactive Waste ◽  
Experimental Validation ◽  
Gamma Ray ◽  
Gamma Spectroscopy ◽  
Low Energy ◽  
The Matrix ◽  
Measurement Uncertainties ◽  
Waste Drums

Abstract The determination by gamma spectroscopy of the activity of radionuclides emitting low energy radiation (less than 200 keV) in bituminized waste drums can be affected by significant uncertainty if the chemical composition of the matrix is not well-known. Indeed, some elements with high atomic numbers (Z) can significantly modify the absorption of these radiations. The CEA has therefore studied, using numerical simulation, the feasibility of a method which would take into account this effect, based on the analysis of the gamma spectra continuum due to Compton scattering (1). This article describes an experimental validation of the simulations and of the method.

DISINTEGRATION-RATE DETERMINATION BY 4π-COUNTING: PART II. SOURCE-MOUNT ABSORPTION CORRECTION

1955 ◽  
Vol 33 (5) ◽  
pp. 929-937 ◽  
Author(s):  
B. D. Pate ◽  
L. Yaffe
Keyword(s):  
Low Energy ◽  
Absorption Curve ◽  
Correction Factors ◽  
Disintegration Rate ◽  
Type Method ◽  
Curve Type ◽  
End Point ◽  
Absorption Correction ◽  
Sandwich Method

The various methods in use for determining the correction for absorption due to the source mount used in a 4π-counter are discussed, and experiments conducted to test the validity of the correction, arising from these methods, for β emitters of varying end-point energies. The methods all give erroneous corrections for low energy β emitters and possible reasons for the errors introduced by the 'sandwich method' are discussed. An 'absorption curve' type method is proposed which is shown to give more accurate correction factors.

Determination of denudation rates by the measurement of meteoric 10Be in Guadiana river sediment samples (Spain) by low-energy AMS

2018 ◽  
Vol 189 ◽  
pp. 227-235 ◽  
Author(s):  
S. Padilla ◽  
J.M. López-Gutiérrez ◽  
D.M.R. Sampath ◽  
T. Boski ◽  
J.M. Nieto ◽  
...  
Keyword(s):  
River Sediment ◽  
Low Energy ◽  
Sediment Samples ◽  
Denudation Rates

scholarly journals Use of radial symmetry for the calculation of cylindrical absorption coefficients and optimal capillary loadings

2015 ◽  
Vol 48 (1) ◽  
pp. 149-158
Author(s):  
Peter Khalifah
Keyword(s):  
Radial Symmetry ◽  
Correction Factors ◽  
Absorption Coefficients ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Absorption Correction ◽  
Sample Density ◽  
Diffraction Angle ◽  
Path Lengths ◽  
Cylindrical Samples

The problem of numerically evaluating absorption correction factors for cylindrical samples has been revisited using a treatment that fully takes advantage of the sample symmetry. It is shown that the path lengths for all points within the sample at all possible diffraction angles can be trivially determined once the angle-dependent distance distribution for a single line of points is calculated. This provides advantages both in computational efficiency and in gaining an intuitive understanding of the effects of absorption on the diffraction data. A matrix of absorption coefficients calculated for μRproducts between 0 and 20 for diffraction angles θDof 0–90° were used to examine the influence of (1) capillary diameter and (2) sample density on the overall scattered intensity as a function of diffraction angle, where μ is the linear absorption coefficient for the sample andRis the capillary radius. On the basis of this analysis, the optimal sample loading for a capillary experiment to maximize diffraction at angles of 0–50° is in general expected to be achieved when the maximum radius capillary compatible with the beam is used and when the sample density is adjusted to be 3/(4μR) of its original density.

Comparison of Various Descriptions of X-Ray Tube Spectra

1995 ◽  
Vol 39 ◽  
pp. 127-135 ◽  
Author(s):  
B. Schoßmann ◽  
H. Wiederschwinger ◽  
H. Ebel ◽  
J. Wernisch
Keyword(s):  
Energy Range ◽  
Low Energy ◽  
Characteristic Radiation ◽  
X Ray ◽  
Absorption Correction

We have developed an algorithm for calculating the x-ray tube continuum based on the eqidistribution proposed by Love and Scott, extended the description of white and characteristic radiation given by Wiederschwinger et al for the energy range 10 to 50 keV to the low energy range from 5 to 30 keV, and compared the results from this algorithm to those responses obtained from algorithms using the absorption correction of Pochou and Pichoir, Philibert, Sewell and Pella. The comparison to other models showed a significandy better performance by our model.

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