If doubling distance from a point source reduces dose rate by a factor of four, which statement is correct?

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Multiple Choice

If doubling distance from a point source reduces dose rate by a factor of four, which statement is correct?

Explanation:
The dose rate from a point source follows the inverse square law: it is proportional to 1/r^2. When you double the distance (r becomes 2r), the dose rate becomes (1/2)^2 = 1/4 of its original value. So the dose rate reduces to one-quarter. It doesn’t double, stay the same, or increase by four. This relationship is specific to an ideal point source in open space; real setups may have other factors, but for a true point source, the one-quarter result is the expected outcome.

The dose rate from a point source follows the inverse square law: it is proportional to 1/r^2. When you double the distance (r becomes 2r), the dose rate becomes (1/2)^2 = 1/4 of its original value. So the dose rate reduces to one-quarter. It doesn’t double, stay the same, or increase by four. This relationship is specific to an ideal point source in open space; real setups may have other factors, but for a true point source, the one-quarter result is the expected outcome.

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