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Rad T 110

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Rad T 110

Time, Distance, Shielding

The three basic components of reducing radiation exposure

- Radiation exposure is dependent on the length of the exposure.
- Obviously, if you are exposed for 1 minute you will receive a lower dose than if you are exposed for 5 minutes.

- The assumption here is that the dose rate remains constant

- For radiologic technologists you should only be exposed during fluoroscopy exams.
- Unfortunately, you will have little control during these of the exposure time. Consequently, you will need to distance and shielding to minimize your exposure.

- As the diagram demonstrates x-rays diverge from their source. Therefore, the farther away you are from the source the less your exposure will be

I1

I2

D22

D12

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- Mathematically, the inverse square law is how we express the divergent beam.
- As the distance doubles, the exposure decreases by a factor of 4.

- What can be shielded
- You
- Usually only during fluoroscopy

- The patient
- When appropriate

- The room
- Tested by a physicist.
- Primary and secondary

- The equipment
- Against leakage

- You