Standardization of Ca-45 radioactive solution by tracing method

Ponge-Ferreira, Cláudia Regina Ponte; Koskinas, Marina F.; Dias, Mauro da S.

doi:10.1590/s0103-97332004000500062

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…Due to availability reasons 45 Ca was used instead of 60 Co in efficiency determination for 60 Co, but the beta energies of 60 Co (318 keV) and 45 Ca (257 keV) are adequately similar enabling the use of 45 Ca standard in this context. 60 Co standard has been used for determination of 45 Ca inversely in a corresponding way [24].…”

Section: Discussionmentioning

confidence: 99%

Intercomparison exercise on difficult to measure radionuclides in activated steel: statistical analysis of radioanalytical results and activation calculations

Leskinen

Salminen‐Paatero

Gautier

et al. 2020

J Radioanal Nucl Chem

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This paper reports the results obtained during an intercomparison exercise for the determination of difficult to measure radionuclides in activated reactor pressure vessel (RPV) steel samples. In total, eight laboratories participated analysing 14C, 55Fe and 63Ni activity concentrations in RPV steel. In addition, some laboratories also analysed 60Co activity concentrations. Corresponding activity concentrations were also determined using activation calculations. Robust statistical techniques were utilised for the analysis of the results according to ISO 13528 standard. The results showed good agreement for 55Fe and 63Ni results whereas 14C results had significant differences. 60Co results were in quite good agreement.

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Section: Discussionmentioning

confidence: 99%

Intercomparison exercise on difficult to measure radionuclides in activated steel: statistical analysis of radioanalytical results and activation calculations

Leskinen

Salminen‐Paatero

Gautier

et al. 2020

J Radioanal Nucl Chem

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Determinação da taxa de desintegração e das probabilidades de emissão Gama por decaimento do 182Ta

Gishitomi¹

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In this work the procedure developed for the standardization of 182 Ta sources produced by irradiation at the IPEN IEA-R1 research reactor is presented. The 182 Ta decays with a half-life of 114 days by β − emission, populating the excited levels of 182 W. It emits gamma rays with several energies mainly between 31 keV and 264 keV and between 1001 keV and 1453 keV. The measurements were performed in a 4πβ−γ coincidence system by using the extrapolation technique. The coincidence system is composed of a 4π proportional counter coupled to a NaI(Tl) cristal. The measurements were undertaken selecting two windows in the γ-channel, in order to check the consistency of the results. A Monte Carlo calculation was performed in order to predict the behavior of the observed activity as a function of the 4πβ detector efficiency and the results were compared to experimental values. The most intense gamma-ray emission probabilities of 182 Ta were determined by means of an HPGe gamma spectrometer, the germanium efficiency curve was obtained by using sources 152 Eu, 241 Am, 60 Co, 133 Ba and 166m Ho standardized in a primary system. The uncertainties 4 Resultados e Discussões .

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Determinação da taxa de desintegração de TC 99M e IN 111 em sistemas de coincidências

Brito¹

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The 111 In and 99m Tc standardization in a  coincidence system is described.The 111 In was produced by the reaction of 111 Cd (p, n) 111 In in the cyclotron. The 111 In decays with a half life of 2.8 days by electron capture process, populating the excited levels of 111 Cd, emitting two main gamma rays with energies of 171 keV and 245 keV.The 99m Tc decay with a half life of 6.007 h for isomeric transition, from the radioactive decay of 99 Mo . 111 In standardization was carried out in a  system, consisted of a gas flow proportional counter with 4 geometry coupled to a pair of NaI(Tl) scintillation counter with conventional electronics. The gamma window was set comprising the (171 keV + 245 keV) total absorption energy peaks. The choice of the window was based on the analysis of the extrapolation curves prediction, obtained by Monte Carlo simulation. The 99m Tc standardization has been accomplished by the  coincidence method using a thin window proportional counter in a geometry coupled to a single NaI(Tl) scintillation counter. The beta efficiency was varied by electronic discrimination using a software coincidence counting system (SCS). Two windows were selected for the gamma channel: one at 140 keV gamma ray and the other at 20 keV X ray total absorption peaks. The result of the experimental activity of 111 In two solutions agree with the results obtained by Monte Carlo simulation. The experimental activities of 99m Tc for the two gamma windows are in agreement within the experimental uncertainty, indicating that the adopted methodology is adequate. AgradecimentosA Deus antes de qualquer coisa, pois sem ele eu nada seria. À Dra. Marina Fallone Koskinas orientadora deste trabalho, a paciência e a bondade realmente é um dom, agradeço pela atenção pelas valiosas instruções, e os ensinamentos não só do trabalho em si, mas ensinamentos da vida. Ao Dr. Mauro da Silva Dias, pelo suporte técnico e pela assistência no meu trabalho. À Msc. Ione M. Yamazaki por muitas vezes me ajudar no laboratório, com a parte de metalização dos filmes. Ao Instituto de Pesquisas Energéticas e Nucleares pela oportunidade de realização do presente trabalho. Ao CNPq órgão do governo federal, pela bolsa concedida para este estudo. Aos meus amigos do IPEN, tanto os que fizeram disciplinas comigo quanto os que estiveram presentes aqui nos cafés e no dia a dia deste convívio no CRPq ao longo destes três anos.Aos meus amigos do lado de fora do IPEN, que eu não poderia esquecer, pois sempre me incentivaram e me deram ouvidos na hora em que precisei.Ao Rodrigo Dias Vilela, com paciência sempre me ajudando e me apoiando. À minha família, pois tudo que faço é pensando neles, me deram base e ensinamentos que me fizeram chegar até aqui, e sempre me apoiaram nos meus estudos.

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Standardization of Ca-45 radioactive solution by tracing method

Cited by 5 publications

References 2 publications

Intercomparison exercise on difficult to measure radionuclides in activated steel: statistical analysis of radioanalytical results and activation calculations

Intercomparison exercise on difficult to measure radionuclides in activated steel: statistical analysis of radioanalytical results and activation calculations

Determinação da taxa de desintegração e das probabilidades de emissão Gama por decaimento do 182Ta

Determinação da taxa de desintegração de TC 99M e IN 111 em sistemas de coincidências

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