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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.

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Rad T 110

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

  2. 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

  3. 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.

  4. 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

  5. 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.

  6. 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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