lodine has many isotopes, including: Isotope 123 127 13 hours Half-life 128 (stable) 1291 25 minutes 131 1.6 x 107 years 8.0 days (a) Explain how the subatomic structure of these isotopes differ. (1 mark) (b) 131/ decays to 131Xe. What type of decay process is this? (0.5 mark) (c) How long would it take for the activity of a sample of 131/ to drop from 1.9 x 108 Bq to 7.8 x 107 Bq? (2 marks) (d) Identify one isotope from this table that could be useful in medicine, and one that would not. Justify your choices. (1.5 marks) Page 19 of 24