DP Chemistry (last assessment 2024)
Question 17N.3.hl.TZ0.21c
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.hl.TZ0.21c |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
17N.3.hl.TZ0.21c
Lutetium-177 is used in radiotherapy. It emits beta radiation when it decays.
(c)
Explain the low environmental impact of most medical nuclear waste.
[2]
Markscheme
Any two of:
emits weak ionising radiation
OR
low activity/radioactivity
can be stored until material becomes inactive AND then disposed with normal waste
«isotopes» have short lives
OR
exist for a short period of time
Award [1 max] for “low-level waste/LLW”.
[Max 2 Marks]
