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Oliveira E.M.,Brazilian National Nuclear Energy Commission | Iwahara A.,Brazilian National Nuclear Energy Commission | Poledna R.,Brazilian National Nuclear Energy Commission | Delgado J.U.,Brazilian National Nuclear Energy Commission | And 3 more authors.
Applied Radiation and Isotopes | Year: 2012

A commercial solution of 65Zn was standardized by the sum peak-method using a planar HPGe detector. The activity results were compared with measurements made with a well type 4πγ ionization chamber, which is traceable to BIPM.RI (II)-K2.Zn-65 key-comparison performed in 2002. The sum-peak value was 42.79kBq/g and the ionization chamber value was 42.74kBq/g both at the reference date. The uncertainty obtained in the sum peak standardization was 0.25% (k=1), and in the ionization chamber was 0.85% (k=1).The results showed that sum-peak method can be used in 65Zn standardization and this method is easier, simpler and more practical than others methods. © 2012 Elsevier Ltd. Source


Costa F.N.,Laboratorio Of Instrumentacao Nuclear | Braz D.,Laboratorio Of Instrumentacao Nuclear | Ferreira F.F.,Federal University of ABC | da Silva T.F.,Federal University of Rio de Janeiro | And 5 more authors.
Radiation Physics and Chemistry | Year: 2014

In this work, synchrotron X-ray powder diffraction data allowed for a successful indexing of LASSBio-1515 compound, candidate to analgesic and anti-inflammatory activity. X-ray powder diffraction data collected in transmission and high-throughput geometries were used to analyze this compound. The X-ray wavelength of the synchrotron radiation used in this study was determined to be λ=1.55054Å. LASSBio-1515 was found to be monoclinic with space group P21/c and unit cell parameters a=11.26255(16)Å, b=12.59785(16)Å, c=8.8540(1)Å, β=90.5972(7)° and V=1256.17(3)Å3. © 2013 Elsevier Ltd. Source


da Silva C.J.,Brazilian Radiological Protection and Dosimetry Institute (IRD) | Loureiro J.S.,Brazilian Radiological Protection and Dosimetry Institute (IRD) | Loureiro J.S.,Laboratorio Of Instrumentacao Nuclear | Delgado J.U.,Brazilian Radiological Protection and Dosimetry Institute (IRD) | And 6 more authors.
Applied Radiation and Isotopes | Year: 2012

The National Laboratory for Metrology of Ionizing Radiation (LNMRI)/Brazil acquired 166mHo and 243Am/239Np solutions from commercial suppliers in order to realize primary standardization and therefore reducing the associated uncertainties. The method used in the standardization was the live-timed 4πΒ(LS)-γ(ΝaI(Tl)) anticoincidence counting. The live-timed anticoincidence system is operated since 2006 in LNMRI and is composed of two MTR2 modules donated by Laboratoire National Henri Becquerel (LNE-LNHB)/France. The data acquisition system uses a homemade LabView program and an Excel file for calculus. These systems have been used for primary standardization at LNMRI for many radionuclides and recently took part in the 124Sb and 177Lu International Key Comparisons with good performance. © 2012 Elsevier Ltd. Source

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