Read by QxMD icon Read

Applied Radiation and Isotopes

C L Kuo, T L Tsai, K S Chang-Liao, J H Chao
A chemical separation technique for removing interfering gamma-ray radionuclides by combined precipitation of Nb pentoxide and anion exchange was proposed, thereby allowing detection of trace (94)Nb in low-level radwastes. The detection limit for (94)Nb was improved by a factor of 10-10(3), and the scaling factor ((94)Nb/(60)Co) of the radwastes was estimated to be less than 10(-5). This technique can be used for low-level radwaste classification and power reactor decommissioning.
July 12, 2017: Applied Radiation and Isotopes
Can Cheng, Wenbao Jia, Daqian Hei, Zhiyong Wei, Hongtao Wang
Wax deposition in pipelines is a crucial problem in the oil industry. A method based on the prompt gamma-ray neutron activation analysis technique was applied to reconstruct the image of wax deposition in oil pipelines. The 2.223MeV hydrogen capture gamma rays were used to reconstruct the wax deposition image. To validate the method, both MCNP simulation and experiments were performed for wax deposited with a maximum thickness of 20cm. The performance of the method was simulated using the MCNP code. The experiment was conducted with a (252)Cf neutron source and a LaBr3: Ce detector...
July 11, 2017: Applied Radiation and Isotopes
M I Savva, D J Karangelos, M J Anagnostakis
Natural radionuclides, such as short lived radon daughters and (7)Be, have been analyzed in aerosols at the Nuclear Engineering Department of the National Technical University of Athens (NED-NTUA) since many years, with high accuracy and precision. During this research, an effort to detect (22)Na and determine (7)Be/(22)Na ratio in aerosols is presented. In order to study the role of precipitation in surface air (7)Be and (22)Na activity concentration, a procedure for collecting and analyzing rainwater was developed...
July 10, 2017: Applied Radiation and Isotopes
Tobias Schmitz, Matthias Blaickner
A BNCT online neutron monitoring system was tested in a TRIGA reactor, using a silicon PIN-diode with a conversion foil. The setup was tested with different reactor powers at the hot and cold ends of the irradiation channel, using activation foils to compare with measured fluxes. The results demonstrate good reproducibility and show a linear correlation between signal of the PIN-diode and neutron flux at all positions, demonstrating this approach to be suitable for online monitoring of the neutron flux.
July 8, 2017: Applied Radiation and Isotopes
Arun Upmanyu, Gurjot Singh, Heena Duggal, H S Kainth, Atul Bhalla, Sanjeev Kumar
The present work reports Rayleigh scattering cross section measurements for the 39.5keV (Sm- Kα2), 40.1keV (Sm-Kα1) and 45.4keV (Sm-Kβ1,3) X-ray photons in 35 elements with 26 ≤ Z ≤ 83 at backward angle of 139°. The scattering measurements were performed in reflection mode geometrical set up involving a secondary photon source consisting of Samarium (62Sm) target excited by the 59.54keV γ-rays from the (241)Am radioactive source. The scattered photons were detected using a low energy germanium (LEGe) detector...
July 8, 2017: Applied Radiation and Isotopes
Philippe Cassette, Timotheos Altzitzoglou, Andrei Antohe, Mario Rossi, Arzu Arinc, Marco Capogni, Raphael Galea, Arunas Gudelis, Karsten Kossert, K B Lee, Juncheng Liang, Youcef Nedjadi, Pilar Oropesa Verdecia, Tanya Shilnikova, Winifred van Wyngaardt, Tomasz Ziemek, Brian Zimmerman
A comparison of calculations of the activity of a (3)H2O liquid scintillation source using the same experimental data set collected at the LNE-LNHB with a triple-to-double coincidence ratio (TDCR) counter was completed. A total of 17 laboratories calculated the activity and standard uncertainty of the LS source using the files with experimental data provided by the LNE-LNHB. The results as well as relevant information on the computation techniques are presented and analysed in this paper. All results are compatible, even if there is a significant dispersion between the reported uncertainties...
July 6, 2017: Applied Radiation and Isotopes
Sianne Oktaria, Michael L F Lerch, Anatoly B Rosenfeld, Moeava Tehei, Stéphanie Corde
Radiation therapy is rapidly evolving toward the delivery of higher dose rates to improve cancer treatment. In vitro experiments were performed to investigate the response of 9L and MCF-7 cancer cell lines, exposed to 10MV X-ray radiations. Up to 8Gy was delivered at a dose-rate of 50cGy/min compared to 5Gy/min. The data obtained emphasizes the importance of taking into account not only the physical, but also the radiobiological parameters, when planning a particular cancer treatment.
July 6, 2017: Applied Radiation and Isotopes
Matea Krmpotić, Martina Rožmarić, Ljudmila Benedik
Three different types of electrolytes, subsequently modified and adjusted, in combination with three cathode materials used as source backings were analysed for electrodeposition of americium isotopes for alpha-spectrometric measurements. The obtained results are discussed in terms of electrodeposition yield and source quality (source homogeneity and spectral resolution, FWHM). The optimal conditions for source preparation are provided.
July 5, 2017: Applied Radiation and Isotopes
M-C Lépy, L Brondeau, Y Ménesguen, S Pierre, J Riffaud
The efficiency calibration for different high-purity germanium detectors in the low-energy range was established by the conventional method, using standard radioactive sources. The peak shapes were carefully analysed taking account of natural linewidth, full-energy width at half maximum and scattering. Complementary information was obtained by Monte Carlo simulation using the PENELOPE code, after optimization of the geometrical parameters. This was used to measure photon emission intensities of some low-energy emitting radionuclides, including (133)Ba, and compared to the tabulated values...
July 5, 2017: Applied Radiation and Isotopes
M Saiyad Musthafa, A Athaullah, S Anbumani, A Jawahar Ali, Mehrajuddin War, Bilal Ahmad Paray, Mohammad K Al-Sadoon, S S Muthiah, Palani Kembeeram, R Harikrishnan
Using Zebrafish (Danio rerio) as a model organism, we evaluated the radioprotective and antioxidant effects of the Indian traditional medicine Shilajit exposed to X-Ray. The Zebrafish were divided into three experimental groups and control group, each group containing ten fish. The three experimental fish groups, group I, group II and group III were fed with 3, 5 and 7ppm shilajit encapsulated Chironomous larvae and group IV served as a control fed with non- encapsulated larvae. After 60 days of feeding trial, fish were irradiated with X-Ray at a single acute dose of 1Gy...
July 5, 2017: Applied Radiation and Isotopes
John W N Brown, John D Brockman, J David Robertson
The use of hair, toenail, and fingernail as non-invasive monitors of occupational and environmental exposure to (239)Pu are reported. Volunteers from US national laboratories and individuals with suspected environmental exposure to Pu were recruited to participate in the study. The exposure history of cases was assessed using a short questionnaire. Levels of Pu in keratinous materials collected from the exposed individuals were above the limit of detection in 5 of 7 cases with concentrations ranging from 0...
July 1, 2017: Applied Radiation and Isotopes
A R Iurian, G E Millward, O Sima, A Taylor, W Blake
Semi-empirical methods for (210)Pb self-attenuation corrections were applied to sediment samples in vial and cylindrical geometries, and were validated against Monte Carlo modelling. Full Monte Carlo modelling (GESPECOR code) of the Cutshall transmission method was successfully applied for the determination of mass attenuation coefficients and efficiency transfer factors for coaxial detectors, and compared with the values derived from the matrix chemical composition. Simplified approaches were recommended when dealing with large numbers of samples...
July 1, 2017: Applied Radiation and Isotopes
G Lutter, M Hult, G Marissens, H Stroh, F Tzika
At the JRC-Geel's RadioNuclide Metrology sector, a Monte Carlo code based on EGSnrc, and a general purpose calculation sheet implemented in Microsoft Excel(®), have been developed to make the quantitative gamma-ray spectrometry analysis of samples simpler and more robust. The further aim is that the software can be used by non-experts in gamma-ray spectrometry e.g. external researchers using JRC-Geel's facilities through the EUFRAT transnational access scheme. This paper presents the developed Monte Carlo software and the functionality included in the calculation sheet...
June 30, 2017: Applied Radiation and Isotopes
Michal Košťál, Martin Schulc, Vojtěch Rypar, Evžen Losa, Nicola Burianová, Jan Šimon, Martin Mareček, Jan Uhlíř
Zirconium is an important material used in most of reactor concepts for fuel cladding. Thus the knowledge of its cross section is important for reliable prediction of fuel operation. Also (90)Zr(n,2n) reaction, is included in IRDFF files as dosimetry cross section standard. Due to its very high threshold, 12.1MeV, it is suitable for measurement of high energy neutrons. One of possible interesting applications is also evaluation of prompt fission neutron spectra in (235)U and (238)U what is under auspices of the International Atomic Energy Agency in CIELO project...
June 30, 2017: Applied Radiation and Isotopes
Anne-Sophie Salabert, Charlotte Fontan, Caroline Fonta, Mathieu Alonso, Najat Loukh, Marie Bernadette Delisle, Mathieu Tafani, Pierre Payoux
In this study, we describe the radiosynthesis of [(18)F]AV1451 in terms of its pharmaceutical quality and characterise its physical and biological properties. We performed an in vitro serum stability study in fresh human plasma and a plasma protein binding study. The radiochemical yield was 24% (decay corrected), and the product met all regulatory quality requirements. We found that this compound is stable in fresh human plasma and binds tightly to plasma proteins, especially lipoproteins.
June 30, 2017: Applied Radiation and Isotopes
Ahmed Amara Konaté, Huolin Ma, Heping Pan, Zhen Qin, Hafizullah Abba Ahmed, N'dji Dit Jacques Dembele
The availability of a deep well that penetrates deep into the Ultra High Pressure (UHP) metamorphic rocks is unusual and consequently offers a unique chance to study the metamorphic rocks. One such borehole is located in the southern part of Donghai County in the Sulu UHP metamorphic belt of Eastern China, from the Chinese Continental Scientific Drilling Main hole. This study reports the results obtained from the analysis of oxide log data. A geochemical logging tool provides in situ, gamma ray spectroscopy measurements of major and trace elements in the borehole...
June 29, 2017: Applied Radiation and Isotopes
C Bobin, C Thiam, J Bouchard
In the framework of an international BIPM comparison (Bureau International des Poids et Mesures), the activity standardization of (68)Ge in a solution of (68)Ge/(68)Ga in equilibrium provided by NIST was carried out at LNHB. This exercise was organized to meet the growing interest in (68)Ga as a radiopharmaceutical in nuclear medicine services (e.g. as a surrogate of (18)F for PET imaging). Due to the volatility of germanium, the activity standardization of (68)Ge was investigated at LNHB by means of 4πβ-γ coincidence counting based on Cherenkov measurements...
June 29, 2017: Applied Radiation and Isotopes
A Cagniant, S Topin, G Le Petit, P Gross, O Delaune, T Philippe, G Douysset
Lessons-learned from 10 years of noble gas stations operation and dedicated R&D allowed the design of a New Generation of station. In order to produce 60m(3) air equivalent Xenon samples every 8h, it implements: (i) larger sampler unit for Xenon extraction (2 compressors and 8 nitrogen membranes), (ii) new noble gas adsorbent (Ag@ZSM5), (iii) hardened components and (iv) new high resolution coincidence low background spectrometer (HPGe/PIPSBox). Station expected radioxenon sensitivity is lower than 0.3mBq/m(3)...
June 28, 2017: Applied Radiation and Isotopes
Ahmed Amara Konaté, Heping Pan, Huolin Ma, Zhen Qin, Bo Guo, Yao Yevenyo Ziggah, Claude Ernest Moussounda Kounga, Nasir Khan, Fodé Tounkara
The main purpose of the Wenchuan Earthquake Fault Scientific drilling project (WFSD) was to produce an in-depth borehole into the Yingxiu-Beichuan (YBF) and Anxian-Guanxian faults in order to gain a much better understanding of the physical and chemical properties as well as the mechanical faulting involved. Five boreholes, namely WFSD-1, WFSD-2, WFSD-3P, WFSD-3 and WFSD-4, were drilled during the project entirety. This study, therefore, presents first-hand WFSD-4 data on the lithology (original rocks) and fault rocks that have been obtained from the WFSD project...
June 28, 2017: Applied Radiation and Isotopes
Sara Roberta Dos Santos, Camila Maria de Sousa Lacerda, Iêda Mendes Ferreira, André Luís Branco de Barros, Simone Odília Fernandes, Valbert Nascimento Cardoso, Antero Silva Ribeiro de Andrade
Staphylococcus aureus is a specie of great medical importance associated with many infections as bacteremia and infective endocarditis as well as osteoarticular, skin and soft tissue, pleuropulmonary, and device related infections. Early identification of infectious foci is crucial for successful treatment. Scintigraphy could contribute to this purpose since specific radiotracers were available. Aptamers due to their high specificity have great potential for radiopharmaceuticals development. In the present study scintigraphic images of S...
June 28, 2017: Applied Radiation and Isotopes
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"