(a)[3]
Complete the nuclide equation to show this decay. $^{210}_{83}\text{Bi} \rightarrow \; \ldots\; \text{Po} + \; \ldots\; \beta$
(b(i))[2]
Explain why, when no artificial source is present, the detector still gives readings. Name one source of this effect.
(b(ii))[1]
Explain why the readings obtained are not all identical.
(b(iii))[3]
Predict the one-minute reading at the end of this time.