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
The life cycle of a flowering plant.
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