4. Which of the following parts should Joseph adjust to change the objective lens from scanner to HPO?
a. Inclination Joint
c. Stage
b. Revolving Nosepiece
d. Body Tube

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.