DP Chemistry (last assessment 2024)
Question 18N.3.hl.TZ0.22b.ii
| Date | November 2018 | Marks available | [Maximum mark: 1] | Reference code | 18N.3.hl.TZ0.22b.ii |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Suggest | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 1]
18N.3.hl.TZ0.22b.ii
Nuclear isotopes are used in the treatment of cancer.
Gamma radiation is also used in radiotherapy.
(b.ii)
Suggest why the percentage of technetium-99m remaining in the human body two days after injection will be lower than that calculated in (b)(i).
[1]
Markscheme
removed by excretion ✔
Accept any method of excretion.
