# Suppose the pool of water in the previous problem is drained, and all of the air is removed from the

Suppose the pool of water in the previous problem is

drained, and all of the air is removed from the pool. If the average energy of

the neutrons remains the same, what is the intensity of the neutron ux at a

distance of 1 m from the point source if the region within the pool can be

considered to be a complete vacuum?

Suppose that the pool of water in the previous problem is

drained, and the water in the pool is replaced with ordinary air. If the

average energy of the neutrons is still 1 MeV, what is the intensity of the

neutron ux 1 m from the point source?

Previous problem

A small radioactive point source located in the middle of a

large pool of water emits one billion neutrons per second. If the average

energy of the neutrons is 1 MeV, what is the intensity of the neutron ux 1 m

from the point source?