Nuclear and dosimetric features of an isotopic neutron source

作者：Vega Carrillo H R^*; Hernandez Davila V M; Rivera T; Sanchez A

来源：Radiation Physics and Chemistry, 2014, 95: 122-124.

DOI：10.1016/j.radphyschem.2013.05.001

• (PuBe)-Pu-239
• Neutrons
• Bonner sphere spectrometer
• Neutron yield

A multisphere neutron spectrometer was used to determine the features of a (PuBe)-Pu-239 neutron source that is used to operate the ESFM-IPN Subcritical Reactor. To determine the source main features it was located a 100 cm from the spectrometer which was a (LiI)-Li-6(Eu) scintillator and 2, 3, 5, 8, 10 and 12 in.-diameter polyethylene spheres. 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 was carried out to estimate the spectrum and integral features being less than values obtained experimentally due to the presence of Pu-241 in the Pu used to fabricate the source. Actual neutron yield and the mass fraction of Pu-241 was estimated.

• 出版日期2014-2