Search results for: Henrik Ramebäck

Items from 1 to 20 out of 28 results

article

Achieving confidence in trace element analysis for nuclear forensic purposes: ICP-MS measurements using external calibration

Anna Vesterlund, Henrik Ramebäck

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 322 > 2 > 941-948

In this work, problems arising from performing trace element analysis using inductively coupled plasma—mass spectrometry with low measurement uncertainties are addressed. It is shown that some reference materials certified for massic concentration of lanthanides may have either deviating concentrations or underestimated measurement uncertainties. It is also shown that the choice of methods for sample...

article

Avoiding polyatomic interferences in measurements of lanthanides in uranium material for nuclear forensic purposes

Anna Vesterlund, Henrik Ramebäck

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 321 > 2 > 723-731

Measurements of the lanthanide series with ICP-SF-MS provide low detection limits but suffer from oxides of the lighter lanthanides interfering on the heavier ones. In this work, two different methods to measure the lanthanide series without interferences, were investigated and compared to measuring the lanthanides directly with a standard sample introduction system. It is shown that by using a desolvating...

article

Water up-take in fuel pellets studied by Dynamic Vapour Sorption (DVS) analysis and its potential role in self-heating during storage

Calle Nilsson, Henrik Ramebäck, Callum Hill, Mehrdad Arshadi

European Journal of Wood and Wood Products > 2019 > 77 > 1 > 5-14

The self-heating of wood fuel pellets is a well-recognised problem causing fire incidents in the storage of the pellets as well as severe intoxication of workers by elevated carbon monoxide and carbon dioxide levels and oxygen depletion. Possible factors contributing to the self-heating are considered to be autoxidation and microbiological activity, while the role and contribution to the temperature...

article

Evaluation of different methods for measuring 89Sr and 90Sr: Measurement uncertainty for the different methods as a function of the activity ratio

Stina Holmgren Rondahl, Henrik Ramebäck

Applied Radiation and Isotopes > 2018 > 140 > C > 87-95

In case of a radiological emergency situation involving e.g. fission of uranium or plutonium, analysis of radioactive strontium will be of importance. The primary radionuclides of interest are ⁹⁰Sr, its progeny ⁹⁰Y and ⁸⁹Sr. A few days following an event, ⁸⁹Sr will be the predominant radioisotope of strontium. Most methods found in the literature are valid and applicable when measuring ⁹⁰Sr, but when...

article

The application of radiochronometry during the 4th collaborative materials exercise of the nuclear forensics international technical working group (ITWG)

Michael J. Kristo, Ross Williams, Amy M. Gaffney, Theresa M. Kayzar-Boggs, more

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 315 > 2 > 425-434

In a recent international exercise, 10 international nuclear forensics laboratories successfully performed radiochronometry on three low enriched uranium oxide samples, providing 12 analytical results using three different parent-daughter pairs serving as independent chronometers. The vast majority of the results were consistent with one another and consistent with the known processing history of...

article

Overall approaches and experiences of first-time participants in the Nuclear Forensics International Technical Working Group’s Fourth Collaborative Material Exercise (CMX-4)

Doris M. L. Ho, Aubrey N. Nelwamondo, Ayako Okubo, Henrik Ramebäck, more

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 315 > 2 > 353-363

The Fourth Collaborative Material Exercise (CMX-4) of the Nuclear Forensics International Technical Working Group (ITWG) registered the largest participation for this exercise in nuclear forensics, with seven of the 17 laboratories participating for the first time. Each of the laboratories had their strategic role to play in its respective country, analyzing real-world samples using their in-house...

article

Uranium assay and trace element analysis of the fourth collaborative material exercise samples by the modified Davies-Gray method and the ICP-MS/OES techniques

Aubrey N. Nelwamondo, Lisa P. Colletti, Rachel E. Lindvall, Anna Vesterlund, more

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 315 > 2 > 379-394

An international group of laboratories participating in CMX-4 subjected three samples to comparative nuclear forensic analysis using uranium assay and trace element analysis techniques to determine if the samples had similar or different origins. Uranium assay indicated that two pellet samples (ES-2 and ES-3) were nearly pure UO₂ while the black powder sample ES-1 was primarily UO₂ with UO₃ and/or...

article

Comparing results of X-ray diffraction, µ-Raman spectroscopy and neutron diffraction when identifying chemical phases in seized nuclear material, during a comparative nuclear forensics exercise

Stina Holmgren Rondahl, Fabien Pointurier, Linnea Ahlinder, Henrik Ramebäck, more

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 315 > 2 > 395-408

This work presents the results for identification of chemical phases obtained by several laboratories as a part of an international nuclear forensic round-robin exercise. In this work powder X-ray diffraction (p-XRD) is regarded as the reference technique. Neutron diffraction produced a superior high-angle diffraction pattern relative to p-XRD. Requiring only small amounts of sample, µ-Raman spectroscopy...

article

Erratum to: Inter-laboratory exercise with an aim to compare methods for ⁹⁰Sr and ^239,240Pu determination in environmental soil samples

Jixin Qiao, Susanna Salminen-Paatero, Stina Holmgren Rondahl, Marie Bourgeaux-Goget, more

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 314 > 2 > 827-827

In the original article, the LOD assigned to method Sr-B in Table 1 was published incorrectly as 24 Bq/kg, the correct LOD for that method should be 10.4 Bq/kg. As a consequence the range of LODs, as presented in the first sentence of the section Limit of detection should be stated as “It can be seen from Table 1 that, the LODs of ⁹⁰Sr vary from 0.2 to 10.4 Bq/kg among the four methods used in this...

article

Crystal structure of radium sulfate: An X-ray powder diffraction and density functional theory study

Artem V. Matyskin, Rikard Ylmen, Petra Lagerkvist, Henrik Ramebäck, more

Journal of Solid State Chemistry > 2017 > 253 > C > 15-20

Radium-barium sulfate (Ra_0.76Ba_0.24SO₄) powder was examined using X-ray Diffraction (XRD) technique and its crystal structure was optimized using Density Functional Theory (DFT). XRD data show that radium and barium sulfate form a solid solution and that Ra_0.76Ba_0.24SO₄ is orthorhombic and isostructural with pure RaSO₄, barite (BaSO₄), celestite (SrSO₄) and anglesite (PbSO₄), crystallizing in the...

article

Inter-laboratory exercise with an aim to compare methods for ⁹⁰Sr and ^239,240Pu determination in environmental soil samples

Jixin Qiao, Susanna Salminen-Paatero, Stina Holmgren Rondahl, Marie Bourgeaux-Goget, more

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 314 > 2 > 813-826

In order to deliver reliable results for a multitude of different scenarios, e.g. emergency preparedness, environmental monitoring, nuclear decommissioning and waste management, there is a constant process of method development in the field of radioanalytical chemistry. This work presents the results of a method comparison exercise aimed at quantifying ⁹⁰Sr and ^239,240Pu in environmental soil samples,...

article

Impact of Ag and NOx compounds on the transport of ruthenium in the primary circuit of nuclear power plant in a severe accident

Ivan Kajan, Teemu Kärkelä, Unto Tapper, Leena-Sisko Johansson, more

Annals of Nuclear Energy > 2017 > 100 > P2 > 9-19

Ruthenium is a semi-volatile element originating as a fission product in nuclear reactors that can be released in case of a severe nuclear accident. In this work, the impact of atmosphere composition on the transport of ruthenium through the primary circuit was examined. The effects of silver nanoparticles representing aerosols and NO₂ gas as a product of air radiolysis were studied. Quantification...

article

Time optimization of ⁹⁰Sr determinations: sequential measurement of multiple samples during decay of ⁹⁰Y

Stina Holmgren Rondahl, Annika Tovedal, Oscar Björnham, Henrik Ramebäck

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 311 > 2 > 1143-1148

This work presents an optimized method for the determination of multiple samples containing ⁹⁰Sr when its daughter ⁹⁰Y 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 ⁹⁰Y is measured...

article

Disassembly of old radium sources and conversion of radium sulfate into radium carbonate for subsequent dissolution in acid

Artem V. Matyskin, Burçak Ebin, Mikhail Tyumentsev, Stefan Allard, more

Journal of Radioanalytical and Nuclear Chemistry > 2016 > 310 > 2 > 589-595

In this work details of safe radium source disassembly which were previously used in brachytherapy are described and different methods for conversion of RaSO₄ into aqueous solution are reviewed. The method of choice included three cycles of RaSO₄ heating in 1.5 M Na₂CO₃ up to 85 °C, cooling and subsequent removal of supernatant. X-ray diffraction study showed that the method allows the synthesis of,...

article

Time optimization of 90Sr measurements: Sequential measurement of multiple samples during ingrowth of 90Y

Stina Holmgren, Annika Tovedal, Oscar Björnham, Henrik Ramebäck

Applied Radiation and Isotopes > 2016 > 110 > C > 150-154

The aim of this paper is to contribute to a more rapid determination of a series of samples containing ⁹⁰Sr by making the Cherenkov measurement of the daughter nuclide ⁹⁰Y more time efficient. There are many instances when an optimization of the measurement method might be favorable, such as; situations requiring rapid results in order to make urgent decisions or, on the other hand, to maximize the...

article

Characterization of strong 241Am sources

Anna Vesterlund, Dina Chernikova, Petty Cartemo, Kåre Axell, more

Applied Radiation and Isotopes > 2015 > 99 > Complete > 162-167

Gamma ray spectra of strong ²⁴¹ Am sources may reveal information about the source composition as there may be other radioactive nuclides such as progeny and radioactive impurities present. In this work the possibility to use gamma spectrometry to identify inherent signatures in ²⁴¹ Am sources in order to differentiate sources from each other, is investigated. The studied signatures...

article

Implementation of calculation codes in gamma spectrometry measurements for corrections of systematic effects

Sofia Jonsson, Tim Vidmar, Henrik Ramebäck

Journal of Radioanalytical and Nuclear Chemistry > 2015 > 303 > 3 > 1727-1736

Four calculation codes were implemented on experimental data to calculate corrections of common systematic effects within high resolution gamma spectrometry. The detector parameters were sparsely optimized to imitate the usage that can be expected from personnel with limited experience. The transfer of the efficiency from the calibration geometry (60 ml, density 1.0 g/cm ³ ) to...

article

A laboratory exercise on systematic effects in gamma ray spectrometry

Henrik Ramebäck, Sofia Jonsson, Stefan Allard, Christian Ekberg, more

Journal of Radioanalytical and Nuclear Chemistry > 2015 > 304 > 1 > 467-471

A laboratory exercise for calculation of true coincidence summing correction factors as well as calculating the effect of deviations between sample and standard source (filling height) was developed. This laboratory exercise was held in a masters course in nuclear chemistry the first time during fall 2013. The aim of the exercise was to high-light the importance of correcting for biases due to different...

article

Recrystallization of ²²³Ra with barium sulfate

Natallia Torapava, Henrik Ramebäck, Enzo Curti, Petra Lagerkvist, more

Journal of Radioanalytical and Nuclear Chemistry > 2014 > 301 > 2 > 545-553

In this work, the kinetics of barium sulfate recrystallization has been studied in acidic 0.01 mol dm⁻³ sodium sulfate solution using ²²³Ra and ¹³³Ba tracers at very low total radium concentration, i.e. less than 10⁻¹³ mol dm⁻³. It was found that the system follows the homogeneous recrystallization model and that recrystallization rates, inferred by the decrease of ²²³Ra and ¹³³Ba in the aqueous solution,...

article

Distribution and transport of radionuclides in a boreal mire – assessing past, present and future accumulation of uranium, thorium and radium

Fredrik Lidman, Henrik Ramebäck, Åsa Bengtsson, Hjalmar Laudon

Journal of Environmental Radioactivity > 2013 > 121 > Complete > 87-97

The spatial distribution of ²³⁸ U, ²²⁶ Ra, ⁴⁰ K and the daughters of ²³² Th, ²²⁸ Ra and ²²⁸ Th, were measured in a small mire in northern Sweden. High activity concentrations of ²³⁸ U and ²³² Th (up to 41 Bq ²³⁸ U kg ⁻¹ ) were observed in parts of the mire with a historical or current inflow of groundwater from the surrounding...

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Keywords

NUCLEAR FORENSICS (7)
GAMMA SPECTROMETRY (5)
RADIUM (4)
90SR (3)
CO-PRECIPITATION (3)
89SR (2)
90SR (2)
90Y (2)
89SR (2)
90Y (2)
COMBINED UNCERTAINTY (2)
DEAD TIME (2)
GUM (2)
ICP-MS (2)
IMPURITIES (2)
INTERFERING NUCLIDES (2)
KINETICS (2)
OPTIMIZATION (2)
RADIOANALYTICAL PROCEDURES (2)
RADIOLOGICAL EMERGENCY (2)
STRONTIUM (2)
SYSTEMATIC EFFECTS (2)
TRACE ELEMENT ANALYSIS (2)
UNCERTAINTY BUDGET (2)
URANIUM (2)
URANIUM OXIDE (2)
241AM (1)
AFTERPULSING (1)
AGE (1)
AIR INGRESS (1)
AIR RADIOLYSIS (1)
ALKALINE-EARTH METALS (1)
ALPHA SPECTROMETRY (1)
ARRHENIUS (1)
BARITE (1)
BARIUM (1)
CARBONATE (1)
CMX-4 NEW PARTICIPANTS (1)
COINCIDENCE SUMMING (1)
COMMERCIAL SOFTWARE (1)
DAVIES-GRAY (1)
DECONVOLUTION (1)
DETECTION LIMIT (1)
DISSOLUTION (1)
EFFICIENCY TRANSFER (1)
EFFTRAN (1)
ELECTRON MULTIPLIER (1)
EMERGENCY PREPAREDNESS (1)
EXTENDING/NON-EXTENDING (1)
EXTERNAL CALIBRATION (1)
GAMMA-RAY SPECTROMETRY (1)
GERMANIUM DETECTOR (1)
HPGE (1)
IN SITU MEASUREMENTS (1)
INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (1)
INTERFERENCES (1)
ISOTOPE RATIO (1)
ISOTOPE RATIO MEASUREMENT (1)
LANTHANIDES (1)
LEAD (1)
MASS SPECTROMETRY (1)
MDA (1)
MEASUREMENT UNCERTAINTY (1)
METHOD COMPARISON (1)
MIRE (1)
MONTE CARLO (1)
MULTIPLE SAMPLES (1)
NEUTRON DIFFRACTION (1)
NOVEL APPROACHES (1)
NUCLEAR POWER PLANT (1)
NUCLEAR WASTE (1)
NUCLEAR WEAPONS DETONATION (1)
PEAT (1)
PHASE IDENTIFICATION (1)
PU (1)
PULSE COUNTING (1)
QUALITY CONTROL (1)
RADIOCHEMICAL ANALYSIS (1)
RADIOCHRONOMETRY (1)
RADIUM SULFATE (1)
RASO4 (1)
REACTOR COOLANT WATER (1)
RECRYSTALLIZATION (1)
RUTHENIUM (1)
SEQUENTIAL MEASUREMENT (1)
SEVERE ACCIDENT (1)
SIGNATURES (1)
SIMULATION (1)
SOIL (1)
SPECTRUM SUBTRACTION (1)
SR (1)
SULFATE (1)
THERMAL IONIZATION MASS SPECTROMETRY (1)
THORIUM (1)
TRUE COINCIDENCE SUMMING (1)
UNCERTAINTY (1)
UNCERTANTY CONTRIBUTION (1)
URANIUM ASSAY (1)
WETLAND (1)
X-RAY DIFFRACTION (1)
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Springer (19)
Elsevier (9)

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Search results for: Henrik Ramebäck

Achieving confidence in trace element analysis for nuclear forensic purposes: ICP-MS measurements using external calibration

Avoiding polyatomic interferences in measurements of lanthanides in uranium material for nuclear forensic purposes

Water up-take in fuel pellets studied by Dynamic Vapour Sorption (DVS) analysis and its potential role in self-heating during storage

Evaluation of different methods for measuring 89Sr and 90Sr: Measurement uncertainty for the different methods as a function of the activity ratio

The application of radiochronometry during the 4th collaborative materials exercise of the nuclear forensics international technical working group (ITWG)

Overall approaches and experiences of first-time participants in the Nuclear Forensics International Technical Working Group’s Fourth Collaborative Material Exercise (CMX-4)

Uranium assay and trace element analysis of the fourth collaborative material exercise samples by the modified Davies-Gray method and the ICP-MS/OES techniques

Comparing results of X-ray diffraction, µ-Raman spectroscopy and neutron diffraction when identifying chemical phases in seized nuclear material, during a comparative nuclear forensics exercise

Erratum to: Inter-laboratory exercise with an aim to compare methods for ⁹⁰Sr and ^239,240Pu determination in environmental soil samples

Crystal structure of radium sulfate: An X-ray powder diffraction and density functional theory study

Inter-laboratory exercise with an aim to compare methods for ⁹⁰Sr and ^239,240Pu determination in environmental soil samples

Impact of Ag and NOx compounds on the transport of ruthenium in the primary circuit of nuclear power plant in a severe accident

Time optimization of ⁹⁰Sr determinations: sequential measurement of multiple samples during decay of ⁹⁰Y

Disassembly of old radium sources and conversion of radium sulfate into radium carbonate for subsequent dissolution in acid

Time optimization of 90Sr measurements: Sequential measurement of multiple samples during ingrowth of 90Y

Characterization of strong 241Am sources

Implementation of calculation codes in gamma spectrometry measurements for corrections of systematic effects

A laboratory exercise on systematic effects in gamma ray spectrometry

Recrystallization of ²²³Ra with barium sulfate

Distribution and transport of radionuclides in a boreal mire – assessing past, present and future accumulation of uranium, thorium and radium

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