# Rad T 110 - PowerPoint PPT Presentation

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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

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

• 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

• 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.

### 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