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

Question

Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive 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. source is placed inside a Map 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 o 10 20 30 40 S0 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Time (days) a) If the initial sample is 1.25 g, what mass of the original iridium-192 remains after 130 days? Nu continued below... Previous 3 Give Up & View Solution Check Answer xtExt ? Hint

Explanation / Answer

a.) As we can see from the graph that after 130 days 30% of the sample is remaining so,

mass of indium remain after 130 days = (1.25 x 30)/ 100

= 0.375g

b.) As we can also see from the graph that after 70 days sample becomes 50% so half-life = 70 days

we can also calculate it ,

first calculate k from formula = (ln[A]t - [lnA]o)/t

and then t1/2= 0.693/k

c.) it takes two half life two decay 3/4 of the sample so that remaining sample is 1/4.

so days require = 70 x 2

= 140 days

if you satisfied with the solution please like it.. thanks..

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