Determination of k 0 and Q 0 for 74 Se, 113 In, 186 W and 191 Ir targets applying covariance analysis

• Published in: Applied radiation and isotopes 2019-08, Vol.154, p.108846
• Main Authors: Barros, L F, Ribeiro, R V, Dias, M S, Moralles, M, Semmler, R, Yamazaki, I M, Koskinas, M F
• Format: Article
• Language: English
• ISSN: 1872-9800

In the present work, the determinations of k and Q for Se, In, W and Ir targets were performed. The irradiations were conducted near the core of the IEA-R1 4.5 MW swimming-pool nuclear research reactor of the Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP - Nuclear and Energy Research Institute), in São Paulo, Brazil. The irradiation position was chosen where the neutron spectrum shape parameter α is very close to zero. For this reason, the correction to be applied for the determination of Q is very close to one, thus improving the accuracy of the results. For each experiment, two irradiations were carried out in sequence: the first one with bare samples and the second with a cadmium cover around the samples. All partial uncertainties were considered, applying the covariance matrix methodology. The final results were compared with the literature.