Nuclear Radition Quiz Please Help me!?

Question

1) A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (cpm) compared to 40 cpm for new wood. If carbon-14 has a half-life of 5730 years, what is the age of the wood?
A) 1430 yr B) 22,900 yr C) 17,200 yr D) 5730 yr E) 11,500 yr


2) A person begins to suffer radiation sickness at an exposure level of
A) 5 rem. B) 600 rem. C) 100 rem. D) 500 rem. E) 25 rem.
3) Gamma rays require the heaviest shielding of all the common types of nuclear radiation because

3)gamma rays have the
A) largest particles.
B) highest energy.
C) heaviest particles.
D) most intense color.
E) lowest energy.


4) Iodine-131 decays by beta emission to 4)
A) tellurium-131.
B) bromine-131
C) iodine-132.
D) xenon-131.
E) iodine-130

5) Radium-226 decays by alpha emission to 5)
A) barium-131.
B) radon-222.
C) carbon-14.
D) polonium-218.
E) cobalt-60.

Answer 1

1)
4*5730 = 22,920
2) C--100rem
3) B) highest energy.
4) D) xenon-131.
5) B) radon-222.