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Q.56

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1237

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Short Answer

A chest x ray uses 10 keV photons with an RBE of 0.85. A 60 kg person receives a 0.30 mSv dose from one chest x ray that exposes 25% of the patient’s body. How many x ray photons are absorbed in the patient’s body?

Dose

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Step by Step Solution

Step 1{ Given Information

Then the dose is Given by

dose=

step 2: Calculation

The amount of energy received by the body is

Step 3: Expression

photons absorbed patient's body=Therefore, the number of X-ray photons absorbed by the body is the ratio of the energy absorbed by the body and the energy absorbed by the photons

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