If the distance from the radiation source is reduced from 20 cm to 10 cm, the exposure increases by what factor?

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Multiple Choice

If the distance from the radiation source is reduced from 20 cm to 10 cm, the exposure increases by what factor?

Explanation:
Exposure follows the inverse square law: the exposure at a point is proportional to 1 over the distance squared from the source. Halving the distance from 20 cm to 10 cm means you are at half the distance, so the factor is (20/10)^2 = 2^2 = 4. In other words, exposure increases fourfold when distance is reduced by half. This highlights why increasing distance is a primary safety measure in radiography, along with shielding and proper technique.

Exposure follows the inverse square law: the exposure at a point is proportional to 1 over the distance squared from the source. Halving the distance from 20 cm to 10 cm means you are at half the distance, so the factor is (20/10)^2 = 2^2 = 4. In other words, exposure increases fourfold when distance is reduced by half. This highlights why increasing distance is a primary safety measure in radiography, along with shielding and proper technique.

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