Which two of the following technical changes will decrease the air KERMA measured in the primary beam?

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Multiple Choice

Which two of the following technical changes will decrease the air KERMA measured in the primary beam?

Explanation:
Air kerma in the primary beam is set by how many photons reach the air and how much energy each photon carries. Reducing the tube current (mA) lowers photon production, so kerma decreases. Reducing the kilovoltage peak (kVp) lowers the energy per photon and also reduces the number of higher-energy photons produced, further lowering kerma. Decreasing distance would increase kerma due to the inverse-square law, and increasing beam energy would generally raise kerma. So the two changes that decrease air kerma are lowering mA and lowering kVp.

Air kerma in the primary beam is set by how many photons reach the air and how much energy each photon carries. Reducing the tube current (mA) lowers photon production, so kerma decreases. Reducing the kilovoltage peak (kVp) lowers the energy per photon and also reduces the number of higher-energy photons produced, further lowering kerma. Decreasing distance would increase kerma due to the inverse-square law, and increasing beam energy would generally raise kerma. So the two changes that decrease air kerma are lowering mA and lowering kVp.

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