Radiation Protection Procedures

1
Radiation Protection Procedures

• Chapter 40 Bushong
• Chapter 1 Sherer

2
Units of measurement

• Exposure -Radiation intensity of air
• What is the unit of measurement?
• Dose-radiation energy absorbed from radiation
  exposure
• What is the unit of measurement?
• Effective dose-biological effectiveness of the
  radiation energy absorbed
• What is the unit of measurement?

3

• What is the recommended dose limit for radiologic
  personnel?
• 50 mSv/yr
• 5000mrem/yr
• 5rem/yr
• All of the above

4

• The occupational dose should not normallY exceed
  1 mSv/yr (100mrem/yr)
• See chart 40-1
• Fluoro/portables (Exposure exposure rate x time)
• Which is better for the operator in terms of
  exposure in a fluoroscopy study
• Tube over patient?
• Tube under patient?

5
Personnel Exposure in

• Interventional
• What part of the body receives the highest dose?
• Mammography
• Requires minimal or no lead shielding. Why?
• CT
• Describe the beam in the CT room
• Surgery
• Interesting results from study
• Mobile
• Who must be badged?

6

• Think of two reasons why society is interested in
  exposure rates to patients

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ESE, GONADAL DOSE,MEAN MARROW DOSE

• Look at Landauer with new eyes!
• Compare chart 40-2 in Bushong with TABLE 1-5 (pg
  20) in Sherer. Is there a discrepancy?
• ESE and nomograms
• Mean marrow dosesee table 40-3(Bushong) and
  table 1-7 in Shererhow are they different?

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Genetically Significant Dose

• Estimating gonad dose suspected genetic effects
  of radiation
• Averages those patients who are irradiated and
  those who are not
• Calculates the total genetic effect over a large
  population

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DOSE IN CT IMAGING

• SKIN DOSE-HIGHER
• SPIRAL/MULTISLICE IMAGING HIGHER
• 5 OF X-RAYS ARE CT SCANS YET CT SCAN ATTRIBUTE
  FOR 35 OF TOTAL PATIENT DOSE
• AVE FLUORO DOSE
• Pgs 591-592 very important

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REDUCING OCCUPATIONAL EXPOSURE

• 95 of occupational exposure comes from?
• In fluoro, an RT should
• A portable the cord should be
• The three types of personnel monitors are?
• Describe how the radiation is calculated.
• MC RT students wear?

11
Sherer Chpt 1

• Diagnostic Efficacy
• BERT Values
• Equivalent dose Eqd
• Effective dose EfD

12
REVIEW QUESTIONS IN SHERER-PAGE 23-24