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 allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of to healthy tissue. iridium-192 is often used in the head or breast. Answer the following three questions fa, b, and c) based on the radioactive decay curve of iridium-192. shown below. Clickan the graph and move the mouseover a point to get values for that point. Sample remaining 30 Time (days) a) If the initial sample is 1.00 g, what mass of the orignal ridium-192 remains after 35 days? aontmued below.

Explanation / Answer

b) Estimated t1/2 from graph = 74 days

a) Initial concentration of Ir ie. No = 1g

Time asked T = 35 days

and as it appears from graph, t1/2 = 74 days (approx)

The amount left after nth t1/2 can be given as:

N = No(1/2)n

Here, n = 35/74 = 0.4729

So, N = 1(1/2)0.4729

      N = 0.720g

c) Approximatelly 32 days.

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