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What is the mass of in a cancer therapy transillumination unit containing 5.00 kCi of
Solution
Verified5Here we calculate what is the mass of used in cancer therapy. The has the activity of 5kCI and consulting the Appendix in the book we can see it has a half-life of 5.271 years, which is s. So, to calculate the mass of this element, firstly we need to remember the definition of activity:
where is exactly the number of the atoms which will enable us to calculate the mass of the element.
First, we should remember the relation of radioactivity units of Curie and Becquerel, which is: .
Following this, now we can convert to Becquerels, so we have:
Now expressing the number of the atoms from the first equation we got:
Putting in all of the numbers:
We get the result of:
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