Absorption of X-rays (AQA A-Level Physics): Quizzes

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Absorption of X-rays
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What is attenuation of X-rays?

Reduction in intensity via absorption

Which factor does NOT affect the attenuation of X-rays?

Temperature of the material

How does X-ray intensity change with thickness for a monoenergetic beam?

Decreases exponentially

What is the formula for X-ray intensity after passing through material?

I=I0e−μxI = I_0 e^{-\mu x}

What does the linear attenuation coefficient μ\mu depend on?

Density of the material

What is the formula for the mass attenuation coefficient μm\mu_m?

μm=μρ\mu_m = \frac{\mu}{\rho}

What does the mass attenuation coefficient depend on?

Material composition only

What is the half-value thickness x1/2x_{1/2}?

Thickness reducing intensity to half

What is the formula for half-value thickness?

x1/2=ln⁡2μx_{1/2} = \frac{\ln 2}{\mu}

Why do denser tissues like bone appear different in X-ray images?

They attenuate X-rays more

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Radionuclide Imaging and Therapy

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