x&Howard; Community Coll x New Tab m/ibiscms/mod/ibis/view.php?id-4114349 Saplin

Question

x&Howard; Community Coll x New Tab m/ibiscms/mod/ibis/view.php?id-4114349 Sapling Learning Map Iridium-192 is one radioisotope used in patient's body to treat cancer the tunor while lowering the risk of in which a radioactive source is placed inside a . Brachytherapy allows the use of a higher than normal dose to be placed near 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 80 70 80 50 30 10 0 20 800 90 110 030 40 150 00 70 180 Time (days) a) if the initial sample is 7 .25 g, what mass of the original iridium- 192 remains after 150 days? continued below G Prerous @Gr.3" @ches Answer 0 Next Exit - :

Explanation / Answer

a) After 150 days we can see the sample remaining % = 25%

So, if initial = 7.25 g

Then after 150 days = 1.8125 grams is remaining

b) A half-life is defined as the amount of time required for one-half or 50% of the radioactive atoms to undergo a radioactive decay.

So, we need to find when sample remains half of original

Days = 70 days

c) 1/4th decay means remaing = 3/4 or 75%

From graph when sample remaining is 75% days = 45

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