Worksheet: Ionizing Radiation

In this worksheet, we will practice relating the interactions of types of ionizing radiation to their absorption by thicknesses of different density materials.

Q1:

One half the 𝛾 -rays from a 99mTc sample are absorbed by a 0.170-mm-thick lead shielding layer. Half of the 𝛾 -rays that pass through the first layer of lead are absorbed in a second layer of equal thickness. What thickness of lead will absorb all but one in 1 0 0 0 of these 𝛾 -rays?

Q2:

A 2.00-cm-thick sodium-iodide crystal absorbs all but 1 0 . 0 % of rays from a radioactive source. What percentage of rays will not be absorbed by 4.00-cm thickness of the same material?

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