choose the correct answer.
6. Which among the following is best for shielding against gamma radiation? *
A. aluminum
B. cadmium
C. iron
D. lead
7. Which of the following statements regarding the rate of radioactive decay is false? *
A. The rate of decay follows first order kinetics law
B. The amount of radioactivity at any time undergoes a consistent, continuous change
C. There is no experimental way in which the decay of radioactive atoms can be influenced
D. Tremendous applied pressure on the active sample would suppress the rate of decay
8. If a nuclide has n/p > 1, it emits *
A. beta
B. positron
C. gamma
D. alpha
9. In a radioactive decay, the mass number and also the
A. beta decay
B. K-capture
C. gamma decay
D neutron emission
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