Neutron activation analysis of polyethylene from neutron shield of EDELWEISS experiment

2015 ◽  
Vol 103 (9) ◽  
Author(s):  
Alimardon V. Rakhimov ◽  
Viktor B. Brudanin ◽  
Dmitry V. Filosofov ◽  
Pia Loaiza ◽  
Genko M. Marinov ◽  
...  
Keyword(s):  
Dark Matter ◽  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Neutron Flux ◽  
Nuclear Reactor ◽  
Dark Matter Search ◽  
Neutron Shield ◽  
Search Experiment

AbstractInstrumental neutron-activation analysis (INAA) was applied to estimate trace contaminations in polyethylene (PE) used as a neutron shield for low background setup of the EDELWEISS Dark Matter search experiment. PE samples with masses of 1–10 grams each were irradiated at the WWR-SM nuclear reactor by neutron flux of 1 · 10

Interferences in instrumental neutron activation analysis by threshold reactions and uranium fission for miniature neutron source reactor

2013 ◽  
Vol 101 (9) ◽  
pp. 601-606
Author(s):  
M. Wasim
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Neutron Flux ◽  
Neutron Source ◽  
Fission Products ◽  
Correction Factors ◽  
Uranium Fission ◽  
Instrumental Neutron Activation

Summary Miniature neutron source reactors (MNSR) are known for their stable neutron flux characteristics and are mostly employed for neutron activation analysis (NAA). Interfering reactions are sometimes observed in instrumental neutron activation analysis (INAA). Failure to correct for these interferences produces significant systematic positive errors. This paper provides correction factors for the interferences caused by the threshold reactions and fission products of 235U. These factors were calculated by using the experimentally determined thermal, epithermal and fast neutron flux and epithermal neutron flux shape factor and the nuclear data from the literature using the Høgdahl convention. Correction factors were calculated for (n, p) and (n, α) reactions for the most commonly observed radionuclides in INAA. Similarly, correction factors for uranium fission were calculated for 9 elements (Ce, Ba, La, Mo, Nd, Pd, Ru, Sm and Zr). The correction factors were validated by analyzing different materials. A comparison of uranium fission factors with those published in the literature showed a good agreement except for 97Zr, 99Mo and 131Ba which is due to difference in the flux characteristics. In general, these factors can be used with confidence.

Instrumental Neutron Activation Analysis of River Sediments from Rio Tigre (Venezuela) Employing a Planar Germanium Detector

1986 ◽  
Vol 40 (8) ◽  
pp. 1232-1235 ◽  
Author(s):  
J. J. Labrecque ◽  
P. A. Rosales ◽  
G. Mejias
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Nuclear Reactor ◽  
River Sediment ◽  
River Sediments ◽  
Size Fraction ◽  
Germanium Detector ◽  
Instrumental Neutron Activation

Thirteen elements and eleven rare-earth elements (La, Ce, Nd, Sm, Eu, Gd, Tb, Ho, Tm, Yb, and Lu), as well as thorium and uranium, were determined in river sediment samples from the Tigre River, Venezuela, by instrumental neutron activation analysis employing a low-energy photon detector. The analyses were performed on the <63-μm grain size fraction by the following scheme: one irradiation for only 5 h in IVIC's RV-1 nuclear reactor followed by three counting periods, approximately one, three, and seven weeks after the irradiation. This scheme was employed with the purpose of being able to routinely analyze many samples rather than to optimize thirteen different element determinations.

scholarly journals DYSPROSIUM, CERIUM AND CHROMIUM MARKER DETERMINATION BY INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS

1980 ◽  
Vol 60 (3) ◽  
pp. 749-761 ◽  
Author(s):  
J.J. KENNELLY ◽  
B.V. TURNER ◽  
F.X. AHERNE ◽  
M.J. APPS
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Nuclear Reactor ◽  
Background Activity ◽  
Animal Feed ◽  
Sample Throughput ◽  
Inert Markers ◽  
Instrumental Neutron Activation

An instrumental neutron activation analysis (INAA) procedure has been developed for the measurement of dysprosium (Dy), cerium (Ce) and chromium (Cr) using the Canadian SLOWPOKE nuclear reactor. These elements were included in animal feed at 25 ppm, 61 ppm and 0.34%, respectively. Concentrations in feed and digesta samples were determined by measuring, with a Ge(Li) detector coupled to a 4096 multichannel analyzer, the radioactivity induced by neutron irradiation. Quantitative analysis procedures based on 165mDy (half-life:T1/2 = 1.26 min), 51Cr (T1/2 = 27.8 days) and 141Ce (T1/2 = 32.6 days) were developed after a study of the major contributions to induced background activity in both feed and fecal materials. For short irradiations, 28Al is the dominant induced background activity; for longer irradiations (> 2 h), 38Cl, 56Mn and 24Na dominate. Inert markers with radioisotopes of half-lives less than several minutes (165mDy) or longer than several days (51Cr and 141Ce) are most amenable to instrumental analysis. The application of the methods developed to routine analysis is discussed from the viewpoint of sample throughput and analysis time.

scholarly journals DETERMINATION OF CONTENT OF SOME ELEMENTS IN THE HUMAN BLOOD BY METHOD OF INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS USING DALAT NUCLEAR REACTOR

2011 ◽  
Vol 14 (1) ◽  
pp. 47-54
Author(s):  
Hung Van Nguyen
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Human Blood ◽  
Nuclear Reactor ◽  
Gamma Spectrometer ◽  
Standard Samples ◽  
Instrumental Neutron Activation

Neutron activation analysis using nuclear reactor has been used widely to determine of content of elements in environment, biology, geology, archaeology, etc. In this report, determination of content of some elements in the human blood by method of instrumental neutron activation analysis using Dalat nuclear reactor coupled with processing of results by k-zero method (using k0-Dalat code) and by relative one (using standard samples) is presented. 50 samples of the human blood are mainly collected from public objects in Lamdong province. They are prepared and activated together with the standard samples at the dry channel No. 7-1 and the rotary specimen rack (wet channel) of the reactor. Then they are directly measured by the HPGe gamma spectrometer and the measured data are processed. The experimental results for determination of ranges of contents and average values for 8 elements respectively are Na (1.06 - 2,48; 1.71 ± 0.30 mg/ml), Cl (1.10 - 3.75; 2.66 ± 0.71 mg/ml), Fe (0.26 - 0.72; 0.49 ± 0.09 mg/ml), K (0.31 - 1.14; 0.73 ± 0.15 mg/ml), Zn (4.55 - 13.97; 8.08 ± 1.24 μg/ml), Rb (2.73 - 7.92; 5.11 ± 0.86 μg/ml), Se (0.04 - 0.18; 0.08 ± 0.03 μg/ml) and Sc (0.22 – 1.61; 0.56 ± 0.24 ng/ml). Besides, content of sodium to be determined by the k-zero method and the relative one are compared also. The results for determination of contents of 8 elements in the human samples to be compared with those of other authers are shown that this method has had confidence, and it could be applied routinely in determination of contents of multi-elements.

Trace Element Contents in Thyroid Cancer Investigated by Instrumental Neutron Activation Analysis

2018 ◽  
Vol 1 (1) ◽  
pp. 1-13
Keyword(s):  
Thyroid Cancer ◽  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Trace Element ◽  
Thyroid Tissue ◽  
Tissue Levels ◽  
Trace Element Contents ◽  
Element Contents

Background: Thyroid cancer is an internationally important health problem. The aim of this exploratory study was to evaluate whether significant changes in the thyroid tissue levels of Ag, Co, Cr, Fe, Hg, Rb, Sb, Sc, Se, and Zn exist in the malignantly transformed thyroid. Methods: Thyroid tissue levels of ten trace elements were prospectively evaluated in 41 patients with thyroid malignant tumors and 105 healthy inhabitants. Measurements were performed using non-destructive instrumental neutron activation analysis with high resolution spectrometry of long-lived radionuclides. Tissue samples were divided into two portions. One was used for morphological study while the other was intended for trace element analysis. Results: It was found that contents of Ag, Co, Cr, Hg, and Rb were significantly higher (approximately 12.8, 1.4, 1.6, 19.6, and 1.7 times, respectively) in cancerous tissues than in normal tissues. Conclusions: There are considerable changes in trace element contents in the malignantly transformed tissue of thyroid.

Elemental analysis of medicinal plants from different sites by instrumental neutron activation analysis

2016 ◽  
Vol 5 (03) ◽  
pp. 4892 ◽  
Author(s):  
Ratna Raju M.* ◽  
Madhusudhana Rao P. V. ◽  
Seshi Reddy T. ◽  
Raju M. K. ◽  
Brahmaji Rao J. S. ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Medicinal Plants ◽  
Neutron Activation ◽  
Gamma Ray ◽  
Elemental Content ◽  
Soil Composition ◽  
Gamma Ray Spectrometer ◽  
Instrumental Neutron Activation

A study was undertaken to evaluate the inorganic elements for humans in two Indian medicinal plants leaves, namely Sphaeranthus indicus, and Cassia fistula by Instrumental Neutron Activation Analysis (INAA). INAA experiment was performed by using 20 kW KAMINI Reactor at Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam. The emitted gamma rays were measured using gamma ray spectrometer. The concentrations of Al, Br, Ca, Fe, K, La, Mg, Mn, Na, Sc, V and Zn were determined in the selected medicinal plants. The medicinal leaves are using in treatment of various important ailments. The elemental content in selected medicinal leaves is various proportions depending on the soil composition, location of plant specimen and the climate in which the plant grows.

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