DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ1.c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.hl.TZ1.c
Level hl Paper 3 Time zone TZ1
Command term Suggest Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.3.hl.TZ1.c

Technetium-99m, a widely used radionuclide, has a half-life of 6.0 hours and undergoes gamma decay to technetium-99.

Magnetic resonance imaging (MRI) is an application of NMR technology using radiowaves.

Suggest why MRI is much less dangerous than imaging techniques such as X-rays and radiotracers. Use section 3 of the data booklet.

[1]

Markscheme

lower frequency/longer wavelength/lower energy
OR
does not use ionizing radiation/radionuclides  [✔]

 

Note: Do not accept “does not cause cancer”.

Examiners report

Suggesting why MRI is less dangerous than using X-rays and radiotracers was mostly answered well, but some candidates were confused and linked longer wavelengths with higher energy.

Syllabus sections