Navegação por Autores IPEN "ZAHN, GUILHERME S."

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  • IPEN-DOC 24315

    NOYORI, AMANDA ; SAIKI, MITIKO ; ZAHN, GUILHERME S. . Aluminum determination by instrumental neutron activation analysis in tree barks. Journal of Radioanalytical and Nuclear Chemistry, v. 314, n. 2, p. 935-940, 2017. DOI: 10.1007/s10967-017-5469-6

    Abstract: Neutron activation analysis (NAA) for Al determination in tree bark samples containing phosphorus and silicon was studied. The contributions of the 31P(n,a)28Al and 28Si(n,p)28Al reactions to the 27Al(n,c)28Al reaction were corrected determining interference correction factors. Analytical quality control was evaluated by analyzing certified reference materials. The results presented good accuracy and precision. Replicate Al determinations in bark samples showed relative standard deviations ranging from 4.2 to 10.5%. The detection limits were lower than the mass fractions found in the samples, demonstrating the possibility to apply NAA in Al determinations in tree barks for biomonitoring studies and purposes.

    Palavras-Chave: aluminium; bark; biological materials; calibration standards; element abundance; neutron activation analysis; phosphorus; qualitative chemical analysis; sample preparation; silicon; trees

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  • IPEN-DOC 12694

    GENEZINI, FREDERICO A. ; ZAHN, GUILHERME S. ; RAELE, MARCUS P. ; ZAMBONI, CIBELE B. ; CRUZ, MANOEL T.F. da. Analysis of multi-parametric coincidence measurements with n detectors. In: REUNIAO DE TRABALHO SOBRE FISICA NUCLEAR NO BRASIL, 28., 7-11 de setembro, 2005, Guaruja, SP. Anais... 2005. p. 373-378.

    Palavras-Chave: neutron detectors; multi-parameter analysis; coincidence methods; gamma detection

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  • IPEN-DOC 17023

    OLIVA, JEFFERSON W.M.; ZAHN, GUILHERME S. ; GENEZINI, FREDERICO A. . Analysis of two dead time correction methods for precise half-life determination. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 10th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 17th; MEETING ON NUCLEAR INDUSTRY, 2nd, October 24-28, 2011, Belo Horizonte, MG. Proceedings... Sao Paulo: ABEN, 2011, 2011.

    Palavras-Chave: aluminium; aluminium 28; copper; copper 66; dead time; half-life; nuclear decay; vanadium; vanadium 52

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  • IPEN-DOC 26190

    GERALDO, RICARDO R.; PASCHUK, SERGEI A.; BARRETO, RAFAEL C.; ZAHN, GUILHERME S. ; SILVA, PAULO S.C. da ; SILVA, AMANDA C.M.da; NARLOCH, DANIELLE C.; ARAUJO, ISABELLE C.. Application of semi-empirical model for the evaluation of radium activity in phosphogypsum used as component of clinker. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 965-974.

    Abstract: Phosphogypsum is a residue that has been used by the cement industry as a substitute for the natural gypsum, used as a clinker additive during the production of Portland cement. There is a potential increase in this residue use since the large amount of phosphogypsum is generated as outcome of the phosphate fertilizer industries. However, phosphogypsum can be considered a source of radioactive contamination since it has 226Ra in its composition. Depending on the concentration of 226Ra, from the radiological protection point of view, this may cause a problem because this radionuclide and its direct decay product 222Rn along with other decay products, represent the largest fraction of radiation internal dose received by people. In order to evaluate the level of radiological risk that may be associated with the use of phosphogypsum, it is necessary to identify the concentration of 226Ra in building material. The aim of this research is to analyze the samples of phosphogypsum in relation to the concentrations of 226Ra, determined indirectly through 222Rn activity measurements. This measurement process has the advantage of being fast, convenient and relatively inexpensive when compared to traditional 226Ra concentration in samples measurement methods. Proposed physical-mathematical model was used to establish radium concentration from radon exhalation rate from cement mortar samples. The 222Rn activity measurements were performed with a portable detector with cubic phosphate samples with dimensions of 50x50x50mm3 allocated in a closed atmosphere of sampling chamber until secular equilibrium was reached. Obtained concentrations of radium activity in studied samples of phosphogypsum and cement mortars were found below the limits recommended by CNEN and international regulation.

    Palavras-Chave: concentration ratio; exhalation; gypsum cements; radiation detectors; radiation protection; radium 226; radon 222; brazilian cnen

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  • IPEN-DOC 24100

    LAPOLLI, ANDRE L. ; SECCO, MARCELLO ; GENEZINI, FREDERICO A. ; ZAHN, GUILHERME S. ; MOREIRA, EDSON G. . Automated spectrometer interface for measurement of short half-life samples for neutron activation analysis. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 22-27, 2017, Belo Horizonte, MG. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2017.

    Abstract: In this paper a source positioning system was developed, based on a HPGe detector coupled to a Canberra DAS 1000 data acquisition system and Canberra’s GENIE2K software and libraries. The system is composed of a step motor coupled to an Arduino Uno microcontroller, which is programmed using C language to allow for a source-detector distance between 0.3 and 20 cm - both components are coupled to a PC computer using the USB interface. In order to allow automated data acquisition, two additional pieces of software were developed. The first one, a Human-Machine Interface (HMI) programmed in Visual Basic 6, allows the programming and monitoring of the data acquisition process, and the other, in REXX language, controls the data acquisition process in the background. The HMI is user-friendly and versatile, so that the even rather complex data acquisition processes may be easily programmed. When the experiment scheme is saved, two files are created and used by the REXX code to control the acquisition process so that the data acquisition is automatically stopped and saved after a user-defined time, then the source is repositioned and data acquisition is cleared and restarted. While in the present stage the system only offers three distinct source positions, finer source-position adjusting is under development. In its present configuration the system has been tested for stability and repeatability in all three positions, with an excellent performance.

    Palavras-Chave: neutron activation analysis; spectrometers; equipment interfaces; biological half-life; high-purity ge detectors; automation; data acquisition systems; distance; brazilian cnen

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  • IPEN-DOC 21359

    SECCO, MARCELLO ; MOREIRA, EDSON G. ; GENEZINI, FREDERICO A. ; ZAHN, GUILHERME S. . Automatic sample positioner for short half life nuclides in neutron activation analysis. In: INTERNATIONAL CONFERENCE ON MODERN TRENDS IN ACTIVATION ANALYSIS, 14th; INTERNATIONAL CONFERENCE ON NUCLEAR ANALYTICAL METHODS IN THE LIFE SCIENCES, 11th, August 23-28, 2015, Delft, Netherlands. Abstract... 2015. p. 100.

    Palavras-Chave: neutron activation analysis; isotopes; automation; distance; comparative evaluations

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  • IPEN-DOC 21130

    COSTA, PRISCILA ; RAELE, MARCUS P. ; YORIYAZ, HELIO ; SIQUEIRA, PAULO de T.D. ; ZAHN, GUILHERME S. ; GENEZINI, FREDERICO A. . Boron film thickness determination to develop a low cost neutron using Monte Carlo Method. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 12th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 19th; MEETING ON NUCLEAR INDUSTRY, 4th, October 4-9, 2015, São Paulo, SP. Proceedings... 2015.

    Palavras-Chave: boron; thin films; monte carlo method; neutron flux; neutron detection; alpha particles; thermal neutrons; charged particles; computerized simulation; photodiodes; silicon; thickness

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  • IPEN-DOC 20822

    ZAHN, GUILHERME S. ; GENEZINI, FREDERICO A. ; SECCO, MARCELLO ; TICIANELLI, REGINA B. ; FIGUEIREDO, ANA M.G. . Can robust statistics aid in the analysis of NAA results?. Journal of Radioanalytical and Nuclear Chemistry, v. 306, n. 3, p. 607-610, 2015.

    Palavras-Chave: statistics; sample preparation; elements; concentration ratio; gamma radiation; neutron activation analysis

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  • IPEN-DOC 24073

    ZAHN, GUILHERME S. ; GENEZINI, FREDERICO A. . CAX a software for automated spectrum analysis. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 22-27, 2017, Belo Horizonte, MG. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2017.

    Abstract: In this work, the scripting capabilities of Genie-2000 were used to develop a software that automatically analyses all spectrum les in either Ortec's CHN or Canberra's MCA or CNF formats in a folder, generating two output les: a print-ready text le (.DAT) and a Comma-Separated Values (.CSV) le which can be easily imported in any major spreadsheet software. This software, named CAX (\Convert and Analyse for eXcel"), uses Genie-2000's functions to import spectrum les into Genie's native CNF format and analyze the converted spectra. The software can also, if requested, import energy and FWHM calibrations from a stored calibrated spectrum. The print-ready output le (.DAT) is generated by Genie-2000 using a customized script, and the CSV le is generated by a custom-built DAT2CSV software which generates a CSV le that complies to the Brazilian standards, with commas as a decimal indicator and semicolons as eld separators. This software is already used in the daily routines in IPEN's Neutron Activation Laboratory, greatly reducing the time required for sample analyses, as well as reducing the possibility of transcription errors.

    Palavras-Chave: automation; c codes; calibration; g codes; gamma radiation; brazilian cnen; gamma spectra; neutron activation analysis; performance

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  • IPEN-DOC 26415

    ZAHN, GUILHERME S. ; JUNQUEIRA, LUCAS S. ; GENEZINI, FREDERICO A. . CAX and Xsel: a software bundle to aid in automating NAA spectrum analysis. Brazilian Journal of Radiation Sciences, v. 7, n. 2A, p. 1-7, 2019. DOI: 10.15392/bjrs.v7i2A.565

    Abstract: In this work, the scripting capabilities of Genie-2000 were used to develop a software (CAX) that automatically anal-yses all spectrum files in either ORTEC's CHN or CANBERRA's MCA or CNF formats in a folder, generating two output files: a print-ready text file (.DAT) and a Comma-Separated Values (.CSV) file which can be easily imported in any major spreadsheet software. A second tool, named Xsel, consists in an EXCEL spreadsheet which automatically identifies the spectrum lines associated with the elements of interest, generating a clean output sheet which can be easily imported in a general spreadsheet that calculates the concentrations; an important addition to this spreadsheet is the ability to automatically recalibrate each spectrum, increasing the reliability of the peak identification procedure. These software tools are already used in daily routines at IPEN's Neutron Activation Laboratory, greatly reducing the time required for sample analyses, as well as reducing the possibility of transcription errors.

    Palavras-Chave: automation; neutron activation analysis; gamma radiation; gamma spectra; computer codes; calibration; performance; brazilian cnen; data processing

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  • IPEN-DOC 26964

    GENEZINI, FREDERICO A. ; ZAHN, GUILHERME S. ; MORALLES, MAURICIO ; MOREIRA, EDSON G. . Celebrating IEA-R1 first criticality. In: BRAZILIAN MEETING ON NUCLEAR PHYSICS, 40th, September 3-7, 2017, Campos do Jordão, SP. Abstract... São Paulo, SP: Sociedade Brasileira de Física, 2017. p. 1-1.

    Abstract: Early in 1956 USP and CNPq established a cooperation agreement and in the middle of the same year, the Atomic Energy Institute (IEA) was founded. Its primary task was to install the research nuclear reactor purchased from the American company Babcock & Wilcox in the context of the “Atoms for Peace” Program. Another major task was to train reactor operators and users of the new facility. The first start-up was in September 16, 1957, being the first criticality achieved in the Southern hemisphere. IEA-R1 is a pool type, light water cooled and moderated, graphite reflected research reactor. Although designed to operate continuously up to 5 MW, it operated at 2 MW power during 40 years and afterwards it has been operating at 5MW. IEA R1 has several uses, such as radioactive isotope production by neutron flux irradiation up to 10(14)cm(-2)s(-1), for health and industry applications; research and development using radioactive samples and neutron beams (8 radial and 2 tangential beam ports). This year we celebrate the 60th anniversary of the first criticality of the IEA-R1 research reactor and due to a continuous modernization program, it is expected to operate for another long time period.

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  • IPEN-DOC 26204

    COSTA, PRISCILA ; RAELE, MARCUS P. ; DOMIENIKAN, CLAUDIO ; MADI FILHO, TUFIC ; ZAHN, GUILHERME S. ; GENEZINI, FREDERICO A. . Characterization of a portable thermal neutron detector. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 1163-1170.

    Abstract: A portable thermal neutron detector prototype, using a PIN-type silicon photodiode coupled to a boron converter, was developed at the Nuclear and Energy Research Institute (IPEN-CNEN/SP). Several boron layers were made by Pulsed Laser Deposition method and two different prototypes were made using distinct approaches in the associated electronics. The prototypes were characterized by measurements with the cold neutron beam at PHADES (Polarized 3He and Detector Experiment Station), in the NIST Center for Neutron Research. The distance between the prototype and the neutron source was different for each prototype: 70 cm (prototype one) and 7 cm (prototype two). The linearity behavior was verified for both prototypes in order to verify the relationship between counts and neutron fluence. The intrinsic efficiency values obtained for prototypes one and two were, respectively, (1.78 ± 0.01)% and (5.2 ± 0.4)%. The angular dependence was verified only for prototype one. The concept of this detector can be applied in a future dosimeter project.

    Palavras-Chave: thermal neutrons; photodiodes; portable equipment; silicon; cold neutrons; efficiency; neutron detectors; brazilian cnen

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  • IPEN-DOC 26847

    COSTA, PRISCILA ; RAELE, MARCUS P. ; DOMIENIKAN, CLAUDIO ; COSTA, FABIO E. ; MADI FILHO, TUFIC ; ZAHN, GUILHERME S. ; GENEZINI, FREDERICO A. . A compact electronic system for a photodiode neutron detector. In: JAKSIC, ALEKSANDAR (Ed.); KARAMARKOVIC, JUGOSLAV (Ed.) INTERNATIONAL CONFERENCE ON RADIATION APPLICATIONS, September 16-19, 2019, Belgrade, Serbia. Abstract... Niš, Serbia: Sievert Association, 2019. p. 36-36.

    Abstract: The demand for portable neutron detectors is on the rise, and for that purpose, low cost boron-10 has been frequently used instead of helium-3, which is usually employed in large and expensive detectors. Portable detectors are of interest in some applications, such as neutron dosimeters or inspection systems targeted in the detection of fissile material and drugs in airports. In this work a portable thermal neutron detection system was developed which is based on a commercial silicon photodiode coupled to a boron converter; this prototype is then plugged into a portable electronic system. The boron layer was produced by pulsed laser deposition, either on a thin glass slide or on the photodiode itself. The boron deposition in the photodiode was made directly in the active area of the detector, so before and after the deposition process a characterization of the device regarding both the dark current and the operation voltage was performed using an americium source. Finally, both configurations were tested. The neutron detection process occurs by detecting the alpha and lithium particles produced by the interaction of the incoming neutron with the boron-10 nuclides. These heavy ions then interact with the active area of the reverse-biased photodiode, producing an electric signal that has to be preamplified and then properly amplified by the portable electronic system, which in turn produces an output that can either be sent to a multichannel analyzer or to a digital counter. The integrated circuit of the low noise preamplifier transforms the detector’s current pulse into a voltage pulse with amplitude proportional to the charge carried by the current pulse. The shaper-driver consists of a differentiator and an integrator and is responsible for filtering and further amplifying the preamplifier signal, generating a NIM-compatible energy output pulse. The performance of the photodiode-amplifier set for alpha particles was successively tested using a 243Am radioactive source. Initial tests were made using the boron-deposited glass, and the electronic signal was properly read. However, when the same system was tested using the boron deposited directly in the photodiode, the output signal couldn’t be read, due to the fact that during the deposition process there was an increase in the dark current and a decrease in the operation bias. In this way, a new portable electronic system was developed using a hybrid integrated amplifier circuit. This new electronic setup allowed the use of both configurations, and was tested both with alpha-emitting Americium and neutron-emitting AmBe sources. In conclusion, both portable electronic systems have proven suitable for the thermal neutron detector developed.

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  • IPEN-DOC 26151

    RIBEIRO JR., IBERÊ S. ; GENEZINI, FREDERICO A. ; ZAHN, GUILHERME S. . Comparison of two methodologies for spectra analysis in coincidence neutron activation analysis. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 459-468.

    Abstract: The Research Reactor Center (CERPq) of IPEN-CNEN/SP has been developing a facility for Coincidence Neutron Activation Analysis (CNAA), a variation of the Neutron Activation Analysis technique in which gamma-gamma coincidence is used to reduce spectral interferences and improve detection limits of some elements. As the acquisition results in 2D-coincidence spectra, the spectrum analysis had to be dealt with accordingly. There are two distinct ways to perform these analyses, either directly, by fitting bidimensional peaks in the coincidence matrix, or by gating the spectra in one detector around each peak of interest and fitting the resulting 1D-spectrum in the usual way. In this work the concentrations of As, Co, Cs, Sb and Se were determined in geological and biological reference materials by CNAA using two different methodologies of analysis, using the BIDIM software, which provides 2D-peak-fitting; and a combination of the AnalisaCAEN suite, which gates the 2D-spectra, with Canberra’s Genie2000, which fits the resulting unidimensional spectra. The results allow for a discussion of the advantages and shortcomings of each method, both in terms of usability and of the reliability of the results.

    Palavras-Chave: biological materials; calibration standards; comparative evaluations; concentration ratio; geology; neutron activation analysis; spectra

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  • IPEN-DOC 05578

    ZAHN, GUILHERME S. . Desenvolvimento de um monitor de area para neutrons utilizando detector solido de tracos nucleares. 1994. Dissertacao (Mestrado) - Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP, Sao Paulo. 52 p. Orientador: Marilia Tereza Freitas Cesar Khouri.

    Palavras-Chave: neutron dosimetry; dielectric track detectors

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  • IPEN-DOC 14315

    SILVA, ANTONIO C.O. da; ZAHN, GUILHERME S. ; GENEZINI, FREDERICO A. . Desenvolvimento de um software para ajustes, correcoes e interpolacoes de funcoes de eficiencia de deteccao para detectores HPGE. In: SEMINARIO ANUAL DO PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIACAO CIENTIFICA, 15.; SEMINARIO ANUAL DO PROGRAMA DE BOLSAS E INICIACAO CIENTIFICA, 6., 7-8 de outubro, 2009, Sao Paulo, SP. Resumo expandido... 2009. p. 101-102.

    Palavras-Chave: high-purity ge detectors; efficiency; interpolation; programming; algorithms; gamma radiation; detection

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  • IPEN-DOC 12016

    GENEZINI, FREDERICO A. ; DOMIENIKAN, CLAUDIO ; ZAHN, GUILHERME S. . Design of a gas efflent monitoring system for the sup(18)F production line. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 8th/ MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 15th, Sept. 30 - Oct. 5, 2007, Santos, SP. Proceedings... Sao Paulo: ABEN, 2007, 2007.

    Palavras-Chave: annihilation; coincidence circuits; coincidence spectrometry; cyclotrons; filters; fission product release; fluorine 18; gamma radiation; isotope production; monitoring; nuclear decay; radiation monitors

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  • IPEN-DOC 18892

    SANTOS, ROBERTO M. dos; GENEZINI, FREDERICO A. ; ZAHN, GUILHERME S. . Detector efficiency calibration for extended gamma-ray sources. In: VANIN, VITO R. (Ed.) BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS, 33rd, September 7-11, 2010, Campos do Jordão, SP. Proceedings... American Institute of Physics, 2010. p. 220-230.

    Palavras-Chave: calibration; calibration standards; efficiency; gamma detection; ge semiconductor detectors; monte carlo method

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  • IPEN-DOC 16230

    OLIVA, JEFFERSON W.M.; ZAHN, GUILHERME S. . Determinacao de parametros nucleares de interesse para ativacao neutronica em nucleos de meia-vida curta. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA, 16.; PROGRAMA DE BOLSAS E INICIAÇÃO CIENTÍFICA CNEN, 7., 2-21 de outubro, 2010, Sao Paulo, SP. Resumo expandido... 2010. p. 133-134.

    Palavras-Chave: cross sections; decay; half-life; lifetime; minutes living radioisotopes; neutron activation analysis; nuclear reactions; radiation sources; radioactive materials; vanadium 52; vanadium

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  • IPEN-DOC 21667

    GONCALVES, VITOR C.; ZAHN, GUILHERME S. . Determinação da meia-vida do Co-57 usando dados da verificação diária de detectores. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA, 17.; PROGRAMA DE BOLSAS E INICIAÇÃO CIENTÍFICA CNEN, 8.; PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO DESENVOLVIMENTO TECNOLÓGICO E INOVAÇÃO, 1., 17-18 de novembro, 2011, São Paulo, SP. Resumo expandido... 2011. p. 209-210.

    Palavras-Chave: half-life; cobalt 57; radiation detectors; comparative evaluations; data; high-purity ge detectors

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