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Radiation Protection Procedures

Radiation Protection Procedures. Chapters 39-40 Bushong Chapter 1 Sherer. 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?

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Radiation Protection Procedures

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  1. Radiation Protection Procedures Chapters 39-40 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

  7. ESE, GONADAL DOSE,MEAN MARROW DOSE • ESE 39-1 in Bushong or TABLE 1-5 (pg 20) in Sherer. • ESE and nomograms • Mean marrow dose…see table 39-2(Bushong) and table 1-7 in Sherer…how are they different?

  8. 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

  9. DOSE IN CT IMAGING • SKIN DOSE-HIGHER • SPIRAL/MULTISLICE IMAGING –lower than conventional CT Why? • 10% OF X-RAYS ARE CT SCANS YET CT SCAN ATTRIBUTE FOR 70% OF TOTAL PATIENT EFFECTIVE DOSE • CT dose= AVE FLUORO DOSE • REDUCTION OF UNNECESSART PATIENT DOSE- PGS 604-606

  10. 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

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