Reposting here. I only have 2 more tries to get this answer right.

You want to do an experiment using 47Ca (half-life=4.53 days). You will need 6.00 μg of the nuclide. What mass of CaCO3 (100% enriched in 47Ca) must you order if it will take 49 hours to be delivered to you from the nuclear facility where it is prepared?

Question

Reposting here. I only have 2 more tries to get this answer right.

You want to do an experiment using 47Ca (half-life=4.53 days). You will need 6.00 μg of the nuclide. What mass of CaCO3 (100% enriched in 47Ca) must you order if it will take 49 hours to be delivered to you from the nuclear facility where it is prepared?

joannablackwelder · Answer

Final amount = Initial Amount * (1/2)^n ( n = number of half lives)

joannablackwelder · Answer

Since you need 6g, that would be the final amount.

joannablackwelder · Answer

6 μg that is.

joannablackwelder · Answer

The time it has to decay is 48 hours and the half life is 4.53 days. So, the number of half lives is time to decay/half life (make sure they are in the same unit).

anonymous · Answer

Oh my, didn't realize it was that simple. So I'm assuming micrograms will have to be converted into grams?

joannablackwelder · Answer

If you start with micrograms, you will get micrograms for your initial amount.

anonymous · Answer

Oh, okay. Thank you~