Characterization of neutron spectrum at Es-Salam Research Reactor using Høgdahl convention and Westcott formalism for the k0-based neutron activation analysis

Hamidatou, Lylia; Ramdhane, M.

doi:10.1007/s10967-008-1205-6

Cited by 22 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The k 0 -NAA method is at present capable of tackling a large variety of analytical problems when it comes to the multi-element determination in many practical samples. In this part, we have published a paper [15] for which the determination of the Westcott and Høgdahl parameters have been carried out to assess the applicability of the k 0 -NAA method using the experimental system and irradiation channels at Es-Salam research reactor.…”

Section: B the K 0 -Comparator Methodsmentioning

confidence: 99%

“…Compared with relative method k 0 -NAA is experimentally simpler (it eliminates the need for multi-element standards [3,18], but requires more complicated calculations [19]. In our research reactor, the k 0 -method was successfully developed using the HØGDAHL convention and WESTCOTT formalism [11,15]. The k 0 -method requires tedious characterizations of the irradiation and measurement conditions and results, like the single comparator method, in relatively high uncertainties of the measured values of the masses.…”

Section: B the K 0 -Comparator Methodsmentioning

confidence: 99%

“…In this context, we give a great interest in the neutron study for our irradiation channels by making periodic calibrations using experimental and simulation approaches [11,15,52].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Concepts, Instrumentation and Techniques of Neutron Activation Analysis

Hamidatou¹,

Slamene²,

Akhal³

et al. 2013

Imaging and Radioanalytical Techniques in Interdisciplinary Research - Fundamentals and Cutting Edge Applications

View full text Add to dashboard Cite

Nowadays, there are many elemental analysis methods that use chemical, physical and nuclear characteristics. However, a particular method may be favoured for a specific task, depending on the purpose. Neutron activation analysis (NAA) is very useful as sensitive analytical technique for performing both qualitative and quantitative multielemental analysis of major, minor and traces components in variety of terrestrial samples and extra-terrestrial materials. In addition, because of its accuracy and reliability, NAA is generally recognized as the "referee method" of choice when new procedures are being developed or when other methods yield results that do not agree. It is usually used as an important reference for other analysis methods. Worldwide application of NAA is so widespread it is estimated that approximately 100,000 samples undergo analysis each year. The method is based on conversion of stable atomic nuclei into radioactive nuclei by irradiation with neutrons and subsequent detection of the radiation emitted by the radioactive nuclei and its identification. The basic essentials required to carry out an analysis of samples by NAA are a source of neutrons, instrumentation suitable for detecting gamma rays, and a detailed knowledge of the reactions that occur when neutrons interact with target nuclei. Brief descriptions of the NAA method, reactor neutron sources, and gammaray detection are given below.

show abstract

Section: B the K 0 -Comparator Methodsmentioning

confidence: 99%

Section: B the K 0 -Comparator Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Concepts, Instrumentation and Techniques of Neutron Activation Analysis

Hamidatou¹,

Slamene²,

Akhal³

et al. 2013

Imaging and Radioanalytical Techniques in Interdisciplinary Research - Fundamentals and Cutting Edge Applications

View full text Add to dashboard Cite

show abstract

“…(2.14) no qual considera a contribuição de todas as probabilidades parciais correspondentes de cada ressonância para o valor de energia do nêutron incidente [29][30][31] . [32][33][34][35] O formalismo de Westcott, apresentado em 1958, procura solucionar alguns problemas relacionados com a seção de choque de um espectro de nêutron, descrevendo uma distribuição precisa para as seções de choque que não obedecem a lei-1/ [36] . = Índice que representa a intensidade relativa do componente epitérmico.…”

Section: Fórmula De Breit-wignerunclassified

“…Entretanto, ela é restrita para reações (n, ) nas quais o fator de Westcott é igual à unidade [5,40,41] . Em situações em que difere da unidade, recomenda-se não utilizar a convenção de Høgdahl e considerar a temperatura do nêutron, o que, em outras palavras, significa utilizar o formalismo de Westcott [35,[42][43][44] . Ao longo dos anos, adaptações foram feitas em ambas convenções [32,36,41,44,45] .…”

Section: Convenção De Høgdahlunclassified

Estudo de técnicas estatísticas aplicadas à determinação de parâmetros no método <i>k<sub>0</sub></i> de análise por ativação neutrônica

Ribeiro¹

View full text Add to dashboard Cite

The present work aims to improve a code for calculating k0 and Q0 parameters, called COVAR, adding another method of calculating k0 factor and improving the covariance analysis, creating a new version: COVAR v4.1. The present work also aims the development of a new method of calculating the alpha and several k0 parameters in a single least square fit, by means of a novel methodology, using covariance matrices and all partial uncertainties. For the calculations applying this new method, another code was developed, called AKFIT v2.1 which performs linear and non-linear fittings for the determination of alpha and k0 parameters for several irradiations in different periods. We used a database with irradiations in the years 2008 and 2010 performed at the IEAR-1 nuclear reactor of the IPEN-CNEN/SP, by the Nuclear Metrology Laboratory (LMN), corresponding to radionuclides 95 Zr, 65 Zn, 69m Zn, 46 Sc, 140 La and 60 Co and resulting in 21 data sets which were analyzed in order to verify the performance of COVAR4.1 and AKFIT2.1. For COVAR v4.1, the results with the alternative calculation of k0 factor were close to the already existing calculation and were consistent with the literature. For AKFIT v2.1 fittings were performed with both irradiations simultaneously and separately. The fitted models agreed with the literature. The value was 0,0025(83), which agrees with previous results obtained by the LMN. The correlations between the parameters k0 behaved as expected, with smaller values between different elements and greater correlations between equal elements with different energies and using the same comparator measurement. It can be concluded that the proposed methods were able to calculate the values of k0, with AKFIT v2.1 being a new technique in which it is possible to determine two parameters, alpha and k0 at the same time, quickly and accurately. It is expected that AKFIT code can be improved by adding more parameters, such as Q0 and f, by making a complete fitting for the determination of all the main parameters for the k0 NAA method.

show abstract