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Rad T 110. Time, Distance, Shielding The three basic components of reducing radiation exposure. Time. 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.

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Rad t 110

Rad T 110

Time, Distance, Shielding

The three basic components of reducing radiation exposure


Time

  • 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



Distance
Distance during fluoroscopy exams.

  • 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


I during fluoroscopy exams.1

I2

D22

D12

---

---

=

  • Mathematically, the inverse square law is how we express the divergent beam.

  • As the distance doubles, the exposure decreases by a factor of 4.


Shielding
Shielding during fluoroscopy exams.

  • 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


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