Q1/ A pstient is administered mercury-197 to help evaluate kidney fuction. Mercu

Question

Q1/ A pstient is administered mercury-197 to help evaluate kidney fuction. Mercury-197 has a half - life of 65 hours. what fraction of an initial of an initial does of mercury-197 remains after 6-0 days?

Q2/Strontium-90 in milk. In the years immediately following the explosion at the Chemobyl nuclear power plant, the concentration of 90Sr in cow1s milk in southern Europe was slightly elevated. Some samples contained as much as 1.25 Bq/L of 90Sr radioactivity. The half-life for the beta decay of strontium-90 is 28.8 years.

a/ write a blanced radiochemical equation describing the decay of 90Sr

b/ how many atoms of 90Sr are in a 190.0mL glass of milk with 1.25Bq/L of 90Sr radioactivity? (in atoms)

Explanation / Answer

tI
/2 = ln2/lK

K=ln2/65

therefore using the value ofk

Kt= ln C0/C1

ln2*6*24/65 =ln 1/X =1.53

4.59 = initial /final conc

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