A Beam of 4

Multiple Choice

A beam of 4.5-MeV neutrons is directed at a 0.030-kg tissue sample. Each second, 1.5 × 10⁶ neutrons strike the sample. If the relative biological effectiveness of these neutrons is 7.0, what biologically equivalent dose (in rem) is received by the sample in 65 seconds?

A) 0.23 rem
B) 0.55 rem
C) 1.6 rem
D) 19 rem
E) 33 rem