If distance from a radiation source is doubled, dose rate changes by which factor?

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Multiple Choice

If distance from a radiation source is doubled, dose rate changes by which factor?

Radiation dose rate from a point source follows the inverse square law: the intensity at a given point is proportional to 1 divided by the distance squared. When you double the distance, the dose rate becomes one quarter of its original value because (2)^2 = 4. So the dose rate decreases by a factor of four. This assumes there’s no added shielding or other factors altering the path of the radiation.

Radiation dose rate from a point source follows the inverse square law: the intensity at a given point is proportional to 1 divided by the distance squared. When you double the distance, the dose rate becomes one quarter of its original value because (2)^2 = 4. So the dose rate decreases by a factor of four. This assumes there’s no added shielding or other factors altering the path of the radiation.

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