حساب الاستجابة الطاقية لمطيافية نترونية مكونة من كرة متغيرة القطر من البولي إثلين و الكاشف BF3 منسوبة إلى مصدر النترونات 241Am-Be باستعمال الكود MCNP5-beta

Abstract EN

The MCNP5-beta code was used to calculate the neutron energy response of a neutron spectrometer consisting of a polyethylene sphere (of variable diameter) and a BF3 detector for point and disk 241Am-Be neutron sources.

Based on the energy response, the reaction rates of the 10B(n,α) 7Li reaction were also determined.

The neutron energy response for the disk 241Am-Be neutron source shows higher values than that obtained for the point neutron source.

The response energy functions for disk and point 241Am-Be neutron sources show clear peaks which overpass the peaks of the spectrum of 241Am-Be neutron source which is located in the energy range (0.3-0.4) MeV by using the spheres 3.25, 4.20, 5.00 inch in diameter and at energies 3.0, 4.0 MeV by using the spheres 6.50, 8.00, 10.00 inch in diameter and at energies 5.0, 7.0 MeV using the spheres 12.00, 18.00 inch in diameter.

The neutron energy response for the disk 241Am-Be neutron source shows a maximum value for the sphere of 6.50 inch in diameter, where the response with the point neutron source shows a maximum value for the sphere of 10.00 inch in diameter.

The energy spectrum for a 241Am-Be neutron source was obtained from the energy response functions of the disk and point 242Am-Be neutron sources .

The calculated reaction rates of the 10B(n, α) 7Li reaction for the entire spectra of the point and the disk 241Am-Be sources agreed well with those calculated from the neutron energy response functions of the point and the disk neutron sources