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[en] A Bonner sphere spectrometer was used to determine the features of a 239PuBe neutron source used to operate the ESFM-Ipn Subcritical Reactor. The spectrometer is a 6Lil(Eu) scintillator and 2, 3, 5, 8, 10 and 12 inches-diameter polyethylene spheres, that was located 100 cm from the neutron source. The count rates obtained with the spectrometer were unfolded using the NSDUAZ code and neutron spectrum, total fluence, and ambient dose equivalent were determined. A Monte Carlo calculation, using the MCNP5 code, was carried out to estimate the spectrum and integral features being less that values obtained experimentally due to the presence of 241Pu in the Pu used to fabricate the source. Using the experimental information the actual neutron yield and the mass fraction of 241Pu was estimated. (Author)
Source
Oct 2012; 6 p; Sociedad Mexicana de Irradiacion y Dosimetria; Mexico D. F. (Mexico); 13. International Symposium; 13. Conferencia Internacional; Ocoyoacac, Estado de Mexico (Mexico); 15-19 Oct 2012; 23. National Congress on Solid State Dosimetry; 23. Congreso Nacional sobre Dosimetria de Estado Solido; Ocoyoacac, Estado de Mexico (Mexico); 15-19 Oct 2012; ISBN 978-607-00-6167-7; 