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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

slide2
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
slide3
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.
distance
Distance
  • 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
slide5
I1

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
  • 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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