A certain isotope has a half-life of 32.4 hr and a relative ...

[jrubin]

A certain isotope has a half-life of 32.4 hr and a relative biological effectiveness of 3.50. A sample of this isotope initially delivers an absorbed dose of 0.240 Gy to 250 g of tissue.
 
  (a) What was the initial equivalent dose to the tissue in rem and in sieverts?
  (b) How many joules of energy did the 250-g sample initially receive from the isotope?
  What will be an ideal response?

Question 2

Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g.
 
  By comparing this activity with the activity of living organic matter,
  0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood?
  A) 3870 y
  B) 4250 y
  C) 4590 y
  D) 2630 y
  E) 2940 y

[prumorgan]

Answer to Question 1

Answer: (a) 84 rem, 0.84 Sv (b) 0.060 J

Answer to Question 2

Answer: A