Question

Boral is a commercial shielding material consisting of approximately equal parts by weight of boron carbide (B4C) and aluminum compressed to about 95% theoretical density (2.608 g/cm3) and clad with thin sheets of aluminum 0.25 cm thick.(to simple the question, no need to consider the aluminum cladding but only the thick boral sheet) The manufacturer specifies that there are 0.333 g of boron per cm2 of a boral sheet 0.457 cm in overall thickness. What is the probability that a 0.0253-e V neutron incident normally on such a sheet will succeed in penetrating it?

Answer 1