Pages: 140-146

Authors: Rahim Khabaz and Hashem Miri Hakimabad

Abstract

The multi-sphere method, a neutron detection technique, has been improved with a BF₃ long cylindrical counter as a thermal detector located in the center of seven spheres with a diameter range of 3.5 to 12 inches. Energy response functions of the system have been determined by applying the MCNP4C Monte Carlo code of 10^–8 MeV to 18 MeV. A new shadow cone has been designed to account for scattered neutrons. Although the newly designed shadow cone is smaller in length, its attenuation coefficient has been improved. To evaluate the system, the neutron spectrum of a ²⁴¹AM-Be source has been measured.

 

 

Key words: neutron fluence spectrometry, Bonner sphere, response function, shadow cone

FULL PAPER IN PDF FORMAT ( 1,15 MB)