Table 9.1 presents several properties and corresponding values for $\alpha$-particles, $\beta$-particles and $\gamma$-radiation.
(a)[3]
Complete Table 9.1 by filling in the missing entries.
(b)[1]
State how $\beta$-decay alters the nucleus of an atom.
(c)[4]
Calculate the reading expected on the detector after 75 minutes.
(d)[2]
State two safety precautions used when moving, using or storing radioactive sources in a laboratory.
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