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Units of Radioactivity

Units of Radioactivity. Units of Radioactivity. Curie (Ci) = 2.22 E12 dpm or 3.7E10 dps Becquerel (Bq) = 1 dps Maximum Dose/year = 5 REM or 50 mSv Maximum Dose/year for Declared Pregnant Woman & Minors= 0.5 REM or 5 mSv. Half Life Calculation. Adult ( $18 yrs). Minor (< 18 yrs).

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Units of Radioactivity

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  1. Units of Radioactivity www.assignmentpoint.com

  2. Units of Radioactivity • Curie (Ci) = 2.22 E12 dpm or 3.7E10 dps • Becquerel (Bq) = 1 dps • Maximum Dose/year = 5 REM or 50 mSv • Maximum Dose/year for Declared Pregnant Woman & Minors= 0.5 REM or 5 mSv www.assignmentpoint.com

  3. Half Life Calculation www.assignmentpoint.com

  4. Adult ($18 yrs) Minor (< 18 yrs) Whole body* 5000 mrem/yr 500 mrem/yr Lens of eye 15000 mrem/yr 1500 mrem/yr Extremities 50000 mrem/yr 5000 mrem/yr Skin 50000 mrem/yr 5000 mrem/yr Organ 50000 mrem/yr 5000 mrem/yr Annual Dose Limits External/Internal Exposure Limits for Occupationally Exposed Individuals www.assignmentpoint.com • *Effective dose equivalent

  5. Dose Response Relationships • 0-150 rem—No or minimal symptoms • 150-400 rem—Moderate to severe illness • 400-800 rem—Severe illness deaths start above 500 rem • Above 800 rem—Fatal ***Acute whole body doses www.assignmentpoint.com

  6. Activity Typical Dose Smoking 280 millirem/year Radioactive materials use in a UM lab <10 millirem/year Dental x-ray 10 millirem per x-ray Chest x-ray  8 millirem per x-ray Drinking water  5 millirem/year Cross country round trip by air  5 millirem per trip  Coal Burning power plant 0.165 millirem/year  Your Annual Exposure www.assignmentpoint.com

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  9. Estimated Exposure To The National Population • Between 320 – 360 mr/yr www.assignmentpoint.com

  10. Another Look at Sources www.assignmentpoint.com

  11. Some Exposure Limits • 2 mr/hr Dose rate to public / Federal • 500 mr Emergency responder limit / State/BRC • 5 r/yr Occupational /Federal • 5 r/hr Turn back value / State/BRC • 10 r Property / Federal • 25 r Life saving / Federal • >25r Volunteers only / Federal Ref - 10CFR PART 20, EPA 400, FL-SOP www.assignmentpoint.com

  12. Security • All Radioactive Materials must be secured or under direct supervision at all times • There MUST be someone in the room at all times OR the door must be locked. www.assignmentpoint.com

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