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Question 18M.3.HL.TZ2.15b.i

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.HL.TZ2.15b.i
Level HL Paper 3 Time zone TZ2
Command term State Question number b.i Adapted from N/A
b.i.
[Maximum mark: 1]
18M.3.HL.TZ2.15b.i

The attenuation values for fat and muscle at different X-ray energies are shown.

M18/4/PHYSI/HP3/ENG/TZ2/15.b

(b.i)

State what is meant by half-value thickness in X-ray imaging.

[1]

Markscheme

the thickness of tissue that reduces the intensity «of the X-rays» by a half

OR

x 1 2 = ln ⁡ 2 μ  where  x 1 2  is the half value thickness and μ is attenuation coefficient

 

Symbols must be defined for mark to be awarded

[1 mark]

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