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Journal of Radioanalytical and Nuclear Chemistry

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https://www.readbyqxmd.com/read/28250550/determination-of-the-self-attenuation-based-on-the-sample-composition-in-gamma-ray-spectrometry-of-210-pb-requirements-for-the-scope-of-chemical-analyses
#1
Paweł Jodłowski, Przemysław Wachniew, Jakub Nowak
In the presented paper analysis of sensitivity of self-attenuation correction Cs to the accuracy of chemical composition analysis is presented. The analyses were done by means of Monte Carlo simulation for cylindrical samples and for four sample materials: peat, water, ash and soil. For each of these materials the major elements were selected whose determination in the analysed material is necessary. For the remaining elements threshold levels of their concentration were determined-if expected element concentration in a sample exceeds this value, its determination is indispensable, assuming the accuracy of Cs determination at 3 %...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28250549/monitoring-and-radioecological-characteristics-of-radiocesium-in-japanese-beef-after-the-fukushima-nuclear-accident
#2
Georg Steinhauser
After the Fukushima nuclear accident, beef proved to be a problematic food item with several exceedances entering the market. The reason was contaminated rice straw that was fed to cattle. Japanese authorities responded quickly to the exceedances and made beef one of the most-monitored food items after the Fukushima accident with more than a million samples within 5 years. Activity levels dropped quickly and are now considerably below the regulatory limit. No exceedance of the regulatory limit was observed after October 2012...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28250548/application-of-icp-ms-inaa-and-rnaa-to-the-determination-of-some-difficult-elements-in-infant-formulas
#3
Ewelina Chajduk, Halina Polkowska-Motrenko
In this work a determination of selected elements in the infant formulas commercially available on the Polish market was done. 14 different materials (milk-based formulas and grain porridges) were analyzed. Both, inductively coupled plasma mass spectrometry (ICP-MS) and instrumental neutron activation analysis (INAA) were applied for the determination of As, Cr, Fe and Se, which are recognized as the problematic elements for ICP-MS. For As and Se, the radiochemical NAA was also used. The daily intake of Se and Fe in the age 0-6 months for non-breast fed infants was estimated and compared with present safety limits...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28250547/determination-of-238-pu-239-240-pu-and-241-am-in-air-filters
#4
Katarzyna Rzemek, Andrzej Czerwiński, Jakub Ośko, Katarzyna Tymińska, Małgorzata Dymecka, Tomasz Pliszczyński
The aim of this work is to present the method for sequential plutonium and americium activity determination in air filters using chromatographic radionuclide separation and alpha spectrometry measurement. The developed method may be employed for the purposes of workplace monitoring and as an indicator of the need of introducing the individual monitoring as well as a useful complementation of individual monitoring. Basic parameters describing the developed method such as values of chemical recoveries and minimum detectable activities for plutonium and americium isotopes have been determined...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28250546/fukushima-derived-radiocesium-in-the-western-north-pacific-in-2014
#5
Yuichiro Kumamoto, Michio Aoyama, Yasunori Hamajima, Hisao Nagai, Takeyasu Yamagata, Yoshimi Kawai, Eitarou Oka, Atsushi Yamaguchi, Keiri Imai, Akihiko Murata
In 2014, we measured activity concentration of radiocesium in the western North Pacific Ocean. In the north of Kuroshio Front high activity concentration of Fukushima-derived radiocesium in surface mixed layer in 2012 had been transported eastward by 2014. In the south of the front we found a radiocesium subsurface maximum in 200-600 m depth, which was similar to that observed in 2012. The subsurface maximum spread southward from 18°N to 15°N between 2012 and 2014, which suggests spreading of Fukushima-derived radiocesium into the whole western subtropical area by 2014 due to formation and subduction of the subtropical mode water...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28250545/advances-in-the-development-of-a-dissolution-method-for-the-attribution-of-iridium-source-materials
#6
A P J Hodgson, K E Jarvis, R W Grimes, O J Marsden
To assist in nuclear forensic investigations, new techniques are required to evaluate radioactive materials that may be discovered outside of regulatory control. Using a recently developed pressure digestion method for iridium powder, assessments have been made of this techniques suitability for undertaking iridium target material evaluations. In addition to determining the reaction conditions necessary for total dissolution, these investigations have provided an insight into the elemental impurities that are present within unirradiated iridium targets that are used in QSA Global radiography sources, and established the speciation of the iridium solutions that are formed during this process...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28250544/time-optimization-of-90-sr-determinations-sequential-measurement-of-multiple-samples-during-decay-of-90-y
#7
Stina Holmgren Rondahl, Annika Tovedal, Oscar Björnham, Henrik Ramebäck
This work presents an optimized method for the determination of multiple samples containing (90)Sr when its daughter (90)Y is measured after chemical separation and in sequence, i.e. during its decay. Consequently the measurement times will increase for each subsequent sample, since there has been a longer time for decay before measurement. Compared to a previously published approach, when (90)Y is measured during its ingrowth, the gain in total analysis time (time for ingrowth+ summation of measurement times) is not that large, particularly not for low background instruments...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28250543/research-with-radiation-and-radioisotopes-to-better-understand-plant-physiology-and-agricultural-consequences-of-radioactive-contamination-from-the-fukushima-daiichi-nuclear-accident
#8
Tomoko M Nakanishi
Research carried out by me and my group over the last almost four decades are summarized here. The main emphasis of my work was and continues to be on plant physiology using radiation and radioisotopes. Plants live on water and inorganic elements. In the case of water, we developed neutron imaging methods and produced (15)O-labeled water (half-life 2 min) and applied them to understand water circulation pattern in the plant. In the case of elements, we developed neutron activation analysis methods to analyze a large number of plant tissues to follow element specific distribution...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28111490/long-term-stability-of-cellulose-acetate-butyrate-thin-films-for-nuclear-certified-reference-materials
#9
Renáta Buják, Laurens Delva, Mustafa Erkoç, Jeroen Bauwens, Rožle Jakopič, Laszlo Vincze, Yetunde Aregbe, Ludwig Cardon
Characterization of cellulose acetate butyrate (CAB) thin films with 17, 35 and 52 wt% butyryl is carried out to select the most suitable matrix material for the U and Pu containing large-sized dried spike reference material. The virgin CAB samples were aged by vibrations, heat, humidity, UV light and X-rays. Characterization was done by thermo-analytical techniques, gel permeation chromatography, mechanical tests and via Rayleigh and Compton scattering. The results show that CAB with lower butyryl content can withstand higher operational temperatures and has greater mechanical strength while CAB with higher butyryl content seems to be more resistant to radiation...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28111489/lichens-and-mosses-as-polonium-and-uranium-biomonitors-on-sobieszewo-island
#10
Alicja Boryło, Grzegorz Romańczyk, Bogdan Skwarzec
In the study the activities of polonium (210)Po and uranium (234)U, (238)U radionuclides in moss and lichen samples were determined using the alpha spectrometry. Different lichens and mosses were collected around the Sobieszewo Island (northern Poland) and investigated for potential use as biomonitors for (210)Po and (238)U deposition. Mosses and lichens have a high efficiency in capturing (210)Po and (238)U from atmospheric fallout. The obtained results showed that (210)Po, (238)U concentrations are changing in analyzed thallophytes samples depending on the type of thallus...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28111488/radiosynthesis-of-no-carrier-added-meta-124-i-iodobenzylguanidine-for-pet-imaging-of-metastatic-neuroblastoma
#11
Michael Green, Jonathan Lowe, Manikandan Kadirvel, Adam McMahon, Nigel Westwood, Sue Chua, Gavin Brown
Meta-iodobenzylguanidine (mIBG) has been radiolabelled at the no-carrier-added level with [(124)I] for a proof of concept study to assess the diagnostic accuracy of [(124)I]mIBG PET/CT in detecting metastatic deposits in patients diagnosed with metastatic neuroblastoma. Radiolabelling of mIBG was achieved via the iododesilylation reaction between [(124)I]sodium iodide and meta-trimethylsilylbenzylguanidine. [(124)I]mIBG was produced in 62-70 % radioiodide incorporation yield from [(124)I]sodium iodide. The average amount of formulated [(124)I]mIBG was 359 MBq (range 344-389 MBq) with an average specific radioactivity of 4...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28111487/characterization-and-thermogravimetric-analysis-of-lanthanide-hexafluoroacetylacetone-chelates
#12
Shayan Shahbazi, S Adam Stratz, John D Auxier, Daniel E Hanson, Matthew L Marsh, Howard L Hall
This work reports the thermodynamic characterizations of organometallic species as a vehicle for the rapid separation of volatile nuclear fission products via gas chromatography due to differences in adsorption enthalpy. Because adsorption and sublimation thermodynamics are linearly correlated, there is considerable motivation to determine sublimation enthalpies. A method of isothermal thermogravimetric analysis, TGA-MS and melting point analysis are employed on thirteen lanthanide 1,1,1,5,5,5-hexafluoroacetylacetone complexes to determine sublimation enthalpies...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28111486/solvent-extraction-of-uranium-from-leach-solutions-obtained-in-processing-of-polish-low-grade-ores
#13
Katarzyna Kiegiel, Anna Abramowska, Paweł Biełuszka, Grażyna Zakrzewska-Kołtuniewicz, Stanisław Wołkowicz
Solvent extraction of uranium from acidic and alkaline post-leaching liquors that were obtained by leaching of Polish ores is reported in this paper. The stripping of uranium from organic to aqueous phase was also studied. The synergistic mixture of 2-diethylhexylphosphoric acid (D2EHPA) and tri-n-butylphosphate (0.2 M:0.2 M) was found as a good extracting agent for uranium. Recovery of uranium was reached even 98 %. The effect of such parameters like uranium concentration and concentration of reagents used in the experiments was evaluated in advance by using a model uranium solutions...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28111485/estimation-of-99-mo-production-rates-from-natural-molybdenum-in-research-reactors
#14
M Blaauw, D Ridikas, S Baytelesov, P S Bedregal Salas, Y Chakrova, Cho Eun-Ha, R Dahalan, A H Fortunato, R Jacimovic, A Kling, L Muñoz, N M A Mohamed, D Párkányi, T Singh, Van Dong Duong
Molybdenum-99 is one of the most important radionuclides for medical diagnostics. In 2015, the International Atomic Energy Agency organized a round-robin exercise where the participants measured and calculated specific saturation activities achievable for the (98)Mo(n,γ)(99)Mo reaction. This reaction is of interest as a means to locally, and on a small scale, produce (99)Mo from natural molybdenum. The current paper summarises a set of experimental results and reviews the methodology for calculating the corresponding saturation activities...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/28111484/a-nuclear-geochemical-analysis-system-for-boron-quantification-using-a-focused-ion-beam
#15
E J Charlotta Nilsson, Per Kristiansson, Linus Ros, Nathaly De La Rosa, Mikael Elfman, Ulf Hålenius, Jan Pallon, Henrik Skogby
Ion beam analysis has for decades been used as a tool for geochemical analysis of trace elements using both X-rays (particle induced X-ray emission) and nuclear reaction analysis. With the geoanalytical setup at the Lund Ion Beam Analysis Facility, the boron content in geological samples with a spatial resolution of 1 µm is determined through nuclear reaction analysis. In the newly upgraded setup, a single detector has been replaced by a double sided silicon strip detector with 2048 segments. After optimization, boron content in geological samples as low as 1 µg g(-1) can be measured...
2017: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/27375308/determination-of-241-am-in-urine-using-sector-field-inductively-coupled-plasma-mass-spectrometry-sf-icp-ms
#16
Ge Xiao, David Saunders, Robert L Jones, Kathleen L Caldwell
Quantification of (241)Am in urine at low levels is important for assessment of individuals' or populations' accidental, environmental, or terrorism-related internal contamination, but no convenient, precise method has been established to rapidly determine these low levels. Here we report a new analytical method to measure (241)Am as developed and validated at the Centers for Disease Control and Prevention (CDC) by means of the selective retention of Am from urine directly on DGA resin, followed by SF-ICP-MS detection...
July 2016: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/27325905/data-acquisition-and-analysis-software-for-gamma-coincidence-spectrometry
#17
Martin Shetty, Dağıstan Şahin
Coincidence counting in neutron activation analysis has well-known advantages, most importantly improvement of detection limits. One obstacle to the wider use of this technique is the complexity of the data acquisition and reduction systems that it requires. The usual approaches to multi-detector data acquisition incur significant dead-time, involve redundant work in repeatedly developing limited tools and risk potential errors in low-level code. The paper describes progress made in developing a software framework to address these shortcomings...
July 2016: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/27546944/10th-international-conference-on-methods-and-applications-of-radioanalytical-chemistry-marc-x-introduction
#18
Stephen P LaMont, Samuel E Glover
No abstract text is available yet for this article.
March 2016: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/27909353/gas-phase-detection-of-solid-state-fission-product-complexes-for-post-detonation-nuclear-forensic-analysis
#19
S Adam Stratz, Steven A Jones, Colton J Oldham, Austin D Mullen, Ashlyn V Jones, John D Auxier, Howard L Hall
This study presents the first known detection of fission products commonly found in post-detonation nuclear debris samples using solid sample introduction and a uniquely coupled gas chromatography inductively-coupled plasma time-of-flight mass spectrometer. Rare earth oxides were chemically altered to incorporate a ligand that enhances the volatility of the samples. These samples were injected (as solids) into the aforementioned instrument and detected for the first time. Repeatable results indicate the validity of the methodology, and this capability, when refined, will prove to be a valuable asset for rapid post-detonation nuclear forensic analysis...
2016: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/27909352/solid-phase-extraction-of-tritiated-contaminants-from-tritium-containing-waste-oils
#20
Andrzej Olejniczak, Jacek Fall, Katarzyna Olejniczak, Marina V Gustova, Alexandr G Shostenko
A solid phase extraction method for removing polar tritiated contaminants from tritium-containing waste oils has been developed. The composition of the degradation products present in the waste oil was determined. The results indicated that upon exposure to tritium gas, fragment methyl ketones, carboxylic acids, and lactones were the main polar products of the mineral-based oil oxidation. The nonpolar fragmentation products included n-alkanes, monomethylalkanes, and acyclic isoprenoids and were analogous to those formed during [Formula: see text]-irradiation of the oil...
2016: Journal of Radioanalytical and Nuclear Chemistry
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