(a)[2]
State the make-up of the nucleus of bismuth-214.
(b)[3]
Complete the equation for the decay of bismuth-214. $^{214}_{83}\text{Bi} \rightarrow \; \ldots\ldots\beta + \ldots\ldots\text{Po}$
(c)[2]
Predict the count rate from the sample after 60 minutes.
(d)[2]
State two of the social, economic or environmental issues linked to the storage of radioactive materials with very long half-lives.