Which distance is NOT acceptable between the two dosimeters?

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Multiple Choice

Which distance is NOT acceptable between the two dosimeters?

Explanation:
Two dosimeters must be placed close enough to sample essentially the same part of the radiation field. When they’re near each other, they experience the same fluence, spectrum, and scatter conditions, so their readings can be directly compared or averaged reliably. Distances like 5 cm, 15 cm, or 25 cm keep them within that shared region of the field. A separation of 50 cm is too large; the dosimeters would sample different parts of the field with different dose gradients and scatter contributions, leading to inconsistent readings. So, fifty centimeters is not acceptable in this setup.

Two dosimeters must be placed close enough to sample essentially the same part of the radiation field. When they’re near each other, they experience the same fluence, spectrum, and scatter conditions, so their readings can be directly compared or averaged reliably. Distances like 5 cm, 15 cm, or 25 cm keep them within that shared region of the field. A separation of 50 cm is too large; the dosimeters would sample different parts of the field with different dose gradients and scatter contributions, leading to inconsistent readings. So, fifty centimeters is not acceptable in this setup.

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