Question 18M.3.hl.TZ2.c
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.3.hl.TZ2.c |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Explain, Justify | Question number | c | Adapted from | N/A |
Radioisotopes can be used to treat a wide variety of diseases.
Explain the targeted alpha therapy (TAT) technique and why it is useful.
[3]
alpha-emitting isotopes/212Pb/225Ac attached to drugs/antibodies/chelating ligands/carriers
Award [2 max] for any two of:
absorbed by «cancer/growing» cells
OR
bind to «cancer/growing» cell receptors
alpha particles have high ionizing density/power
short-range of emission «of alpha-particles»
OR
healthy tissues less affected «as slower cell growth»
OR
local effect «on dispersed/spread/metastasised cancers»
Accept “radionuclide” for “isotope”.
Accept “alpha particles are highly ionizing”.
Accept “alpha particles have low penetrating power”.
Accept “used to treat dispersed/spread/metastasised cancers” OR “can be used to map the distribution of cancer cells in the body”.
[3 marks]
