DP Chemistry (last assessment 2024)
Question 18N.3.hl.TZ0.22a
| Date | November 2018 | Marks available | [Maximum mark: 2] | Reference code | 18N.3.hl.TZ0.22a |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
18N.3.hl.TZ0.22a
Nuclear isotopes are used in the treatment of cancer.
(a)
Alpha particles are more damaging to human cells than any other nuclear radiation and yet they are used in targeted alpha therapy (TAT).
Explain how TAT is relatively safe to use in the treatment of dispersed cancers.
[2]
Markscheme
«alpha emitter» carried to/selectively absorbed by cancer cells «by antibody, carrier drug, protein» ✔
low penetrating power
OR
short range ✔
Do not accept just “targets cancer cells and does not affect healthy cells”.
