PLease answer all three parts to this question. Thanks! The graphical values are

Question

PLease answer all three parts to this question. Thanks! The graphical values are your best estimate!

ridium-1 92 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a higher than normal dose to be placed near the tumor w e lowering the risk of damage to healthy tissue ridium-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 10 10 20 30 40 50 00 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Time (days)

Explanation / Answer

(a) From the after 35 days, approximately 71% of radio isotope will remain.

So, remaining isotope after 35 days = 2.50 * 71/100 = 1.775 g.

(b) From the graph time required for the conversion of 50 % of decay radio isotope is approximately 75 days

(c) From the graph time to remiain 1/4 th of original i.e. 25 % of the sample = 150 days.

(OR) 1/4th of the sample means two half lives, so 2 * 75 = 150 days.

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