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Applied Radiation and Isotopes

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https://www.readbyqxmd.com/read/28092780/standardization-of-106-ru-rh-by-live-timed-anticoincidence-counting-and-gamma-emission-determination
#1
C J da Silva, E A Rezende, R Poledna, L Tauhata, A Iwahara, R T Lopes
The absolute activity standardization measurement system of radionuclide by live-timed anticoincidence counting was implemented at LNMRI in 2008 to reduce the effects of some correction factors on the determination of activity with coincidence counting technique used for decades in the laboratory, for example, the corrections of dead time and resolution. With the live-timed anticoincidence system, the variety of radionuclides that can be calibrated by LNMRI was increased in relation to the type of decay. The objective of this study was to standardize the (106)Ru activity, determine gamma emission probabilities by spectrometric method for some energies, and estimate measurement uncertainties...
January 12, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28088002/radiochemical-studies-pre-clinical-investigation-and-preliminary-clinical-evaluation-of-170-tm-edtmp-prepared-using-in-house-freeze-dried-edtmp-kit
#2
Tapas Das, Ajit Shinto, Koramadai K Kamaleshwaran, Haladhar D Sarma, Sahiralam Khan Mohammed, Arpit Mitra, Sangita Lad, M G R Rajan, Sharmila Banerjee
The objective of the present work is to formulate (170)Tm-EDTMP using an in-house freeze-dried EDTMP kit and evaluate its potential as a bone pain palliation agent. Patient dose of (170)Tm-EDTMP was prepared with high radiochemical purity using the lyophilized kit at room temperature within 15min. Pre-clinical evaluation in normal Wistar rats revealed selective skeletal accumulation with extended retention. Preliminary clinical investigation in 8 patients with disseminated skeletal metastases exhibited selective uptake in the bone and retention therein for a long duration...
January 5, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28089086/improved-pressurized-marinelli-beaker-measurements-of-radioactive-xenon-in-air
#3
Troy Robinson, Nick Mann, Tracy Houghton, Matthew Watrous, John Peterson, Paul Fabian, Pat Hipp, Mark Reavis, Francisco Fernandez
INL has shown that a Marinelli beaker geometry can be used for the measurement of radioactive xenon in air using an aluminum Marinelli. A carbon fiber Marinelli was designed and constructed to improve overall performance. This composite Marinelli can withstand sample pressures of 276bar and achieve approximately a 4x performance improvement in the minimum detectable concentrations (MDCs) and concentration uncertainties. The MDCs obtained during a 24h assay for (133)Xe, (131m)Xe, and (135)Xe are: 1.4, 13, and 0...
January 4, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28088001/improving-the-sensitivity-and-accuracy-of-gamma-activation-analysis-for-the-rapid-determination-of-gold-in-mineral-ores
#4
James Tickner, Brianna Ganly, Bojan Lovric, Joel O'Dwyer
Mining companies rely on chemical analysis methods to determine concentrations of gold in mineral ore samples. As gold is often mined commercially at concentrations around 1 part-per-million, it is necessary for any analysis method to provide good sensitivity as well as high absolute accuracy. We describe work to improve both the sensitivity and accuracy of the gamma activation analysis (GAA) method for gold. We present analysis results for several suites of ore samples and discuss the design of a GAA facility designed to replace conventional chemical assay in industrial applications...
January 1, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28087998/performance-evaluation-of-pride-unda-system-with-pyroprocessing-feed-material
#5
Su Jung An, Hee Seo, Chaehun Lee, Seong-Kyu Ahn, Se-Hwan Park, Jeong-Hoe Ku
The PRIDE (PyRoprocessing Integrated inactive DEmonstration) is an engineering-scale pyroprocessing test-bed facility that utilizes depleted uranium (DU) instead of spent fuel as a process material. As part of the ongoing effort to enhance pyroprocessing safeguardability, UNDA (Unified Non-Destructive Assay), a system integrating three different non-destructive assay techniques, namely, neutron, gamma-ray, and mass measurement, for nuclear material accountancy (NMA) was developed. In the present study, UNDA's NMA capability was evaluated by measurement of the weight, (238)U mass, and U enrichment of oxide-reduction-process feed material (i...
December 30, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28087999/identification-of-irradiated-foodstuffs-using-esr-microwave-saturation
#6
Canan Aydaş, Semra Tepe Çam
This study aims primarily to investigate the usage of differences in microwave (MW) saturation behaviour of food samples for identification of radiation treatment. Twenty different samples (dry plant, herbal, spice etc.) which do not have radiation specific satellite ESR signal were especially selected. It is not possible to detect radiation treatment on these samples by European standard (EN 1787, 2000). MW saturation studies were performed on all samples in the range of 0.01-160mW. Our experimental results demonstrate that radiation identification can be possible for ten samples and cannot be possible for the other ten samples by performing the MW saturation studies...
December 29, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28049068/effect-of-oxygen-ion-irradiation-on-dielectric-structural-chemical-and-thermoluminescence-properties-of-natural-muscovite-mica
#7
Sukhnandan Kaur, Surinder Singh, Lakhwant Singh
Thin cleaved samples (~18µm) of natural muscovite mica were irradiated with 80MeV oxygen ion beam at fluence ranging from 1×10(12) to 5×10(13)ion/cm(2). The alterations in dielectric, structural, chemical and thermoluminescence properties of irradiated as well as pristine samples have been investigated. Dielectric constant decreases while other dielectric parameters such as dielectric loss, tanδ, ac conductivity, real and imaginary parts of electric modulus increase with increase of ion fluence. Williamson Hall investigation has been utilized to ascertain crystallite size and micro strain of pristine and irradiated samples...
December 29, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28049067/thermoluminescence-behavior-of-basaltic-rocks-collected-in-southeastern-region-of-turkey
#8
Dilek Toktamış, Hüseyin Toktamış, A Necmeddin Yazıcı
Basalt is well known as an extrusive igneous rock erupts on land by volcanic eruption. It is darker, denser and finer grained compared to the familiar granite of the continents. The study reveals the thermoluminescence properties (TL) of basaltic rocks which collected in southeastern region of Turkey. With this study, the variations of glow curve of the basalt at the different grain sizes, different annealing temperature and different annealing time have been investigated. This study also includes, dose response and heating rate experiments...
December 29, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28089268/analysis-of-radioxenon-and-krypton-85-at-the-bfs-noble-gas-laboratory
#9
C Schlosser, A Bollhöfer, S Schmid, R Krais, J Bieringer, M Konrad
Proportional counters and a β-γ coincidence system and their performance characteristics are described, with emphasis on internal and external quality controls. Typical limits of detection (LD) are 8mBqm(-3) for (85)Kr and 4mBqm(-3) for (133)Xe for the proportional counters, while for similar xenon volumes the LD for (133)Xe in the β-γ system is approximately 4 times lower. Results of comparative analyses agree above the limit of quantification. Xenon-133 levels in southern Germany are presently at or below the LD of the proportional counters, but above the LD of the β-γ system, which is now routinely used for analysis of environmental samples...
December 28, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28063382/determination-of-the-measurement-threshold-in-gamma-ray-spectrometry
#10
M Korun, B Vodenik, B Zorko
In gamma-ray spectrometry the measurement threshold describes the lover boundary of the interval of peak areas originating in the response of the spectrometer to gamma-rays from the sample measured. In this sense it presents a generalization of the net indication corresponding to the decision threshold, which is the measurement threshold at the quantity value zero for a predetermined probability for making errors of the first kind. Measurement thresholds were determined for peaks appearing in the spectra of radon daughters (214)Pb and (214)Bi by measuring the spectrum 35 times under repeatable conditions...
December 28, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28043772/study-of-particular-problems-appearing-in-norm-samples-and-recommendations-for-best-practice-gamma-ray-spectrometry
#11
Andreas Baumgartner, Michael Stietka, Franz Kabrt, Hannah Wiedner, Franz Josef Maringer
In this paper spectral interference effects for selected gamma-emitting radionuclides of the natural decay series and (40)K in selected NORM samples are studied. Recommendations for the choice of γ-lines and the consideration of possible spectral interferences are provided. Special attention is given to the radon tightness of the sample containers. A simple and sensitive method for the estimation of the (222)Rn leakage of sample containers is introduced. The applied polystyrene sample containers show (222)Rn leakages lower than 1%...
December 28, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28041679/low-background-gamma-ray-spectrometry-for-the-international-monitoring-system
#12
L R Greenwood, M G Cantaloub, J L Burnett, A W Myers, C T Overman, J B Forrester, B G Glasgow, H S Miley
PNNL has developed two low-background gamma-ray spectrometers in a new shallow underground laboratory, thereby significantly improving its ability to detect low levels of gamma-ray emitting fission or activation products in airborne particulate in samples from the IMS (International Monitoring System). The combination of cosmic veto panels, dry nitrogen gas to reduce radon and low background shielding results in a reduction of the background count rate by about a factor of 100 compared to detectors operating above ground at our laboratory...
December 28, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28040602/investigation-of-cosmic-ray-induced-background-of-germanium-gamma-spectrometer-using-geant4-simulation
#13
Nguyen Quoc Hung, Vo Hong Hai, Masaharu Nomachi
In this article, a GEANT4 Monte Carlo simulation toolkit was used to study the response of the cosmic-ray induced background on a High-Purity Germanium (HPGe) gamma spectrometer in the wide energy range, up to 100MeV. The natural radiation background measurements of the spectrometer were carried out in the energy region from 0.04 to 50MeV. The simulated cosmic-ray induced background of the Ge detector was evaluated in comparison with the measured data. The contribution of various cosmic-ray components including muons, neutrons, protons, electrons, positrons and photons was investigated...
December 28, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28089269/reference-materials-for-neptunium-determination
#14
S M Jerome, K Carney, R Essex, M E Fassbender, S Goldberg, M Kinlaw, S P LaMont, D Mackney, J J Morrison, F M Nortier
No abstract text is available yet for this article.
December 25, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28089270/coordinated-underground-measurements-of-gamma-ray-emitting-radionuclides-for-plasma-physics-research
#15
Faidra Tzika, Mikael Hult, András Fenyvesi, Iulian Bandac, Detlev Degering, Aldo Ianni, Matthias Laubenstein, Anne de Vismes-Ott, Gerd Marissens, Heiko Stroh, Guillaume Lutter, Soohyun Son, Suk-Ho Hong, Jun Young Kim, Junghee Kim, Mun Seung Cheon, Jungmin Jo, Mihály Braun, József Németh, Sándor Zoletnik, Georges Bonheure
Forty-eight samples made of CaF2, LiF and YVO4 were placed inside the KSTAR Tokamak and irradiated by neutrons and charged particles from eight plasma pulses. The aim was to provide information for plasma diagnostics. Due to the short pulse durations, the activities induced in the samples were low and therefore measurements were performed in five low-background underground laboratories. Details of the underground measurements, together with data on the quality control amongst the radiometric laboratories, are presented...
December 24, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28088000/efficient-degradation-of-butylparaben-by-gamma-radiolysis
#16
Jhimli Paul Guin, Y K Bhardwaj, Lalit Varshney
Gamma radiolysis and ozonolysis are two competitive advanced oxidation processes for degradation of organic pollutants present in the ground water. In this paper, the gamma radiolytic degradation of an emerging organic pollutant Butylparaben (BP) in aqueous solution has been investigated for the first time at different absorbed doses. The effect of the absorbed dose rate in the degradation and mineralization of BP has been investigated. About 65% mineralization of BP was observed at absorbed dose of 70kGy and dose rate of 0...
December 24, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28065630/digital-gamma-gamma-coincidence-hpge-system-for-environmental-analysis
#17
Nikola Marković, Per Roos, Sven Poul Nielsen
The performance of a new gamma-gamma coincidence spectrometer system for environmental samples analysis at the Center for Nuclear Technologies of the Technical University of Denmark (DTU) is reported. Nutech Coincidence Low Energy Germanium Sandwich (NUCLeGeS) system consists of two HPGe detectors in a surface laboratory with a digital acquisition system used to collect the data in time-stamped list mode with 10ns time resolution. The spectrometer is used in both anticoincidence and coincidence modes.
December 24, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28038839/compact-radioactive-aerosol-monitoring-device-for-early-warning-networks
#18
Denis Glavič-Cindro, Drago Brodnik, Toni Petrovič, Matjaž Vencelj, Dušan Ponikvar, Steven James Bell, Lynsey Keightley, Selina Woods
In the frame of the European metrological research project MetroERM, a compact portable aerosol sampling and measurement device was developed at Jožef Stefan Institute. The system incorporates a CeBr3 scintillation detector positioned centrally within a concertinaed filter assembly and an improved high flow rate air pump. It provides continuous on-line low level airborne radioactive particulate monitoring for field station use via 3G network communications. The calibration of the device was performed at National Physical Laboratory (NPL) with filters, spiked with a certified mixed nuclide solution...
December 24, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28063776/photon-emission-intensities-in-the-decay-of-u-235
#19
Marie-Christine Lépy, Sylvie Pierre, Raf Van Ammel, Maria Marouli
New measurements of photon emission intensities in the decay of U-235 were performed. Source was prepared by deposition of a U-235 solution on glass plate. Standardization was carried out by defined solid angle alpha counting, giving the reference activity with 0.7% relative combined uncertainty. Gamma spectrometry was performed with accurately calibrated high-purity germanium detectors. Corrections for source geometry and coincidence summing effects were applied. The reference line (185.72keV) intensity was obtained with 1...
December 23, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28038409/development-of-betavoltaic-cell-technology-production-based-on-microchannel-silicon-and-its-electrical-parameters-evaluation
#20
A A Krasnov, V V Starkov, S A Legotin, O I Rabinovich, S I Didenko, V N Murashev, V V Cheverikin, E B Yakimov, N A Fedulova, B I Rogozev, A S Laryushkin
In the paper a manufacturing process of three-dimensional (3D) microchannel structure by silicon (Si) anodic etching was discussed. The possibility of microchannels formation allows to increase the active area more than 100 times. In this structure the p-n junction on the whole Si surface was formed. The obtained data allowed to evaluate the characteristics of the betavoltaic converter with a 3D structure by using isotope 63Ni with a specific activity of 10Ci/g.
December 23, 2016: Applied Radiation and Isotopes
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