In this lesson, we will learn how to calculate the proportion of electromagnetic radiation that remains when the radiation passes through a solid barrier.

Q1:

A beam of X-rays is directed toward a thick gold sheet. Each X-ray photon in the beam has an energy of 2.21 keV, and the half-thickness of gold for 2.21 keV photons is 0.391 cm. What is the intensity of the beam, as a ratio of the initial intensity, once it has passed through 0.8 cm of the gold sheet? Give your answer to three decimal places.

Q2:

Which of the following formulas correctly relates the half-thickness of a material, 𝑥, to its linear attenuation coefficient, 𝜇?

Q3:

Chromium has a density of 7,190 kg/m^{3}. The mass attenuation coefficient for chromium for 1 keV X-rays is 7.41×10 cm^{2}/g. What is the linear attenuation coefficient of chromium for 1 keV X-rays? Give your answer to four decimal places.

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