If the intensity of radiation 1.0 m from a source is 300. mCi, what is the intensity 3.0 m from the source?

Name: If the intensity of radiation 1.0 m from a source is 300. mCi, what is the intensity 3.0 m from the source?
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Question

Quizplus · Accepted Answer

The intensity of radiation decreases with the square of distance from the source (inverse-square law). Using the inverse-square law equation:

I2 = I1 * (d1/d2)^2

where I1 = 300 mCi, d1 = 1.0 m, d2 = 3.0 m

I2 = 300 * (1/3)^2 = 33 mCi

If the Intensity of Radiation 1