Two different radioisotopes are stored in a laboratory.
• Isotope A: initial activity 120μCi, half-life 8h
• Isotope B: initial activity 4.0MBq, half-life 30h
(i) Convert the initial activities of both isotopes to the same unit (Bq) and state which one is initially more active.
(ii) Determine the activity of each isotope after 24h have elapsed.
(iii) After 24h, which isotope is more active and by what numerical factor is it stronger than the other?