Radiation Protection Procedures

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Presentation transcript:

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 Effective dose-biological effectiveness of the radiation energy absorbed

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

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?

Personnel Exposure in Interventional Mammography CT Surgery Mobile 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’?

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

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

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

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

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?

SHERER CHAPTER 1 RADIATION PROTECTION Diagnostic Efficacy TDS ALARA ORP BERT Values Equivalent dose Eqd Effective dose EfD

Sherer Chpt 1 Manmade Radiation Products EqD Air Travel EqD Nuclear fuel EqD Fallout from Nuclear testing EqD Nuclear Accidents Three mile island Chernobyl

The Ethos project Medical Radiation

REVIEW QUESTIONS IN SHERER-PAGE 23-24