| Date | November 2011 | Marks available | 1 | Reference code | 11N.2.hl.TZ0.2 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | State | Question number | 2 | Adapted from | N/A |
Question
Isotopes are atoms of the same element with different mass numbers. Two isotopes of cobalt are Co-59 and Co-60.
State why the Co-60 radioisotope is used in radiotherapy.
Markscheme
Co-60 emits (penetrating) gamma radiation/rays / OWTTE;
Allow because Co-60 emits radiation which kills/treats cancer cells.
Do not allow answers such as Co-60 is radioactive or Co-60 treats cancer as single statements.
Examiners report
The top students mentioned gamma rays and again this proved to be a good discriminator. One G2 comment stated that this question was not strictly part of AS 2.1.7. However, this is both an Aim 8 AS and Objective 3 and it is expected that candidates would be exposed to this degree of discussion.
Syllabus sections
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