How many radioactive atoms are present in a sample of 6GBq of 99mTc and what is the approximate mass of the sample?
half life = ln2/λ
mass = (no.nuclei * mass number)/avorgado number
avogado = 6.023×10^23
half life = 6 hours
The Attempt at a Solution
worked out λ using the above half life (6 hours) and then N (no. nuclei). My problem is that we was not given the half life to beign with. Is there any other way of working it out without the half life ?