Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive so

Question

Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium-192 is often used in the head or breast Answer the following three questions (a, b, and c) based on the radioactive decay curve of iridium-192, shown below. Click on the graph and move the mouse over a point to get values for that point. Sample remaining (%) 100 901 . 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Time (days) a) If the initial sample is 2.00 g, what mass of the original iridium-192 remains after 150 days?

Explanation / Answer

a)

from the graph , after 150 days , it is 25% of its original

initial = 2.00 g

remianing = (25 / 100 ) x 2 = 0.5 g

mass of iridium remian = 0.500 g

b)

from the graph

half - life = 75 days

c)

one - fourth means 25 % of the sample . from the graph it is 150 days

time taken = 150 days

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