scholarly journals Determination of Americium-241 in sediments by gamma spectroscopy

2000 ◽  
Vol 65 (5-6) ◽  
pp. 451-456
Author(s):  
Mirjana Ristic ◽  
Sandro Degetto ◽  
Teodor Ast
Keyword(s):  
Gamma Spectroscopy ◽  
Global Fallout ◽  
Low Energy ◽  
Radiochemical Method ◽  
Energy Gamma ◽  
Concentration Step ◽  
Series Of Experiments ◽  
Gamma Method ◽  
Optimum Separation

A radiochemical method is given for the determination of Am-241 from the global fallout in sediments. The concept of a concentration step to separate Am-241 from the bulk of the sample (1.2 kg wet) by coprecipitation followed by low energy gamma spectroscopy was investigated. A series of experiments with tracer added was performed to measure the recovery of americium by coprecipitation. Also, a number of real samples without tracer were examined and the conditions for the optimum separation are given. The applied gamma method and the conventional, accurate, but tedious, aplha technique via 243Am, which is usually applied for the determination of Am-241, agreed mostly within 10 %.

scholarly journals Radionuclide x-ray fluorescence analysis of selected elements in agrimony tea samples with preconcentration

2013 ◽  
Vol 60 (2) ◽  
pp. 29-36
Author(s):  
Mikušová V. ◽  
Lukačovičová O. ◽  
Havránek E.
Keyword(s):  
Elemental Analysis ◽  
Analytical Method ◽  
Fluorescence Analysis ◽  
Low Energy ◽  
X Ray ◽  
Nitrocellulose Filter ◽  
Nuclear Analytical Method ◽  
Energy Gamma ◽  
Solid Form

Abstract The contents of selected elements (Mn, Fe, Co, Ni, Cu, Zn, Hg and Pb) in samples of loose tea of agrimony “Repikovy čaj” (Agrimonia eupatoria L.) were studied in this work. Identification and determination of the selected elements content were performed using X-ray fluorescence spectrometry - the nuclear analytical method based on the interaction between low-energy gamma and X radiation and analysed substance. Solid form samples were pressed in tablets and directly analysed. Prepared infusions were analysed after the preconcentration of the elements using precipitation with thioacetamide and ammonium diethyldithiocarbamate with subsequent filtration of created precipitates through a nitrocellulose filter. Detection limits obtained from both methods were compared and their suitability for elemental analysis of plant preparations was discussed.

A semi-empirical approach for determination of low-energy gamma-emmiters in sediment samples with coaxial Ge-detectors

2004 ◽  
Vol 61 (2-3) ◽  
pp. 361-366 ◽  
Author(s):  
E.G San Miguel ◽  
J.P Perez-Moreno ◽  
J.P Bolivar ◽  
R Garcı́a-Tenorio
Keyword(s):  
Empirical Approach ◽  
Low Energy ◽  
Sediment Samples ◽  
Energy Gamma ◽  
Semi Empirical

Influence of bismuth loading in polystyrene-based plastic scintillators for low energy gamma spectroscopy

2014 ◽  
Vol 2 (35) ◽  
pp. 7304 ◽  
Author(s):  
G. H. V. Bertrand ◽  
F. Sguerra ◽  
C. Dehé-Pittance ◽  
F. Carrel ◽  
R. Coulon ◽  
...  
Keyword(s):  
Gamma Spectroscopy ◽  
Low Energy ◽  
Energy Gamma ◽  
Plastic Scintillators

INNER SHELL STUDIES USING INELASTIC COINCIDENCE SPECTROSCOPY OF LOW ENERGY GAMMA RAYS

1987 ◽  
Vol 48 (C9) ◽  
pp. C9-823-C9-826
Author(s):  
S. MANNINEN ◽  
K. HÄMÄLÄINEN ◽  
T. PAAKKARI ◽  
P. SUORTTI
Keyword(s):  
Gamma Rays ◽  
Low Energy ◽  
Energy Gamma ◽  
Coincidence Spectroscopy

The Effect of Stress and Warfarin on the Adrenal Gland in Relation to Spontaneous Hemorrhage, as Judged by Measurement of Adrenal Ascorbic Acid and Serum Corticosterone

1971 ◽  
Vol 26 (02) ◽  
pp. 275-288 ◽  
Author(s):  
S Chattopadhyay ◽  
D. D Johnson ◽  
G. J Millar ◽  
L. B Jaques
Keyword(s):  
Ascorbic Acid ◽  
Acid Concentration ◽  
Ascorbic Acid Concentration ◽  
Corticosterone Concentration ◽  
Serum Corticosterone ◽  
Spontaneous Hemorrhage ◽  
Combined Action ◽  
Series Of Experiments ◽  
Pituitary Adrenal Axis

SummaryRats were subjected to the following procedures: No treatment, Stressor (10% NaCl i.p.), Warfarin for 7 days, Stressor followed by Warfarin; and groups were sacrificed at intervals for assessment of spontaneous hemorrhage and of adrenal ascorbic acid concentration. There was no hemorrhage in the no treatment and stressor groups; some hemorrhage in the warfarin group; profound hemorrhage with Warfarin + Stressor. The adrenal ascorbic acid concentration was found to be lower, 8 h and again 5 days after stress, and remained lower in the warfarin + stress animals. Warfarin had no effect on adrenal ascorbic acid level.In another series of experiments in which the stress consisted of an electric current to the cage floor for 6 sec over 15 min, rats were sacrificed daily for determination of serum corticosterone concentration and occurrence of spontaneous hemorrhage. There was a statistically significant increase of serum corticosterone concentration with stress, warfarin and combined warfarin and stress treatments (P< 0.001 for all three variables). There was a significant correlation (r = 0.96 and 0.89, P< 0.01) for serum corticosterone concentration with hemorrhage score and incidence of hemorrhage in stressed rats receiving warfarin, but not in those receiving only warfarin. The results indicate an activation, rather than an exhaustion, of the pituitary-adrenal axis during the combined action of anticoagulant and stress, which results in the development of spontaneous hemorrhage.

Evaluation of the uncertainty associated with sample holders in NAA measurements in LAN/IPEN

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Guilherme Soares Zahn ◽  
Regina Beck Ticianelli ◽  
Mitiko Saiki ◽  
Frederico Antonio Genezini
Keyword(s):  
Stainless Steel ◽  
Neutron Activation Analysis ◽  
Neutron Activation ◽  
Gamma Rays ◽  
Experimental Error ◽  
Steel Sample ◽  
Low Energy ◽  
Stainless Steel Sample ◽  
Gamma Emission ◽  
Energy Gamma

In IPEN’s Neutron Activation Laboratory (LAN/IPEN), thin stainless steel sample holders are used for gamma spectrometry in NAA measurements. This material is very practical, but its chemical composition may be troublesome, as it presents large amounts of elements with intermediate atomic number, with attenuation factors for low-energy gamma-rays that must not be neglected. In this study, count rates obtained using different sample holders were compared. To accomplish that, an Am-241 source, with 59-keV gamma emission, was used so that low-energy gamma attenuation differences can be determined. Moreover, in order to study the energy dependence of these differences, a Ho-166m source was also used. From these results, it was possible to analyze the experimental error associated to the variations between sample holders, with the aim of introducing an addictive term to the uncertainty analysis of comparative Neutron Activation Analysis results.

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