(a(i))[1]
Write down, in nuclide notation, the symbol for this isotope of lithium.
(a(ii))[3]
Complete Fig. 9.2 to show this decay by drawing the nucleus created in the decay and writing the name of the particle that is the same as a $\beta$-particle.
(b(i))[1]
State why the readings are not all the same.
(b(ii))[1]
Suggest a possible source for this background radiation.
(b(iii))[3]
Predict the count reading when the experiment is carried out again $45\,\text{hours}$ later.