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Ionizing Radiation Units

Ionizing Radiation Units. S.A.SH.Kowsarian MD. Imam Khomeini Hospital, Sari. Activity of an isotope exposure absorbed dose biologic equivalent. Activity of an isotope material. Conventional( cgs ) : curie( Ci ) 37 billion decays/sec SI : becquerel ( Bq ) 1 dacay /sec

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Ionizing Radiation Units

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  1. Ionizing Radiation Units S.A.SH.Kowsarian MD. Imam Khomeini Hospital, Sari

  2. Activity of an isotopeexposureabsorbed dosebiologic equivalent

  3. Activity of an isotope material Conventional(cgs): curie(Ci) 37 billion decays/sec SI: becquerel(Bq) 1 dacay/sec (rutherford=1000,000 becquerel)

  4. Exposure Conventional(cgs): Roentgen(R) The amount of ionizing radiation that induce 1 ESU charge in 1 cc of air 1 ESU=1 franklin(Fr)=258 microcoulomb/Kg SI: coulomb(C)

  5. Absorbed dose Conventional(cgs): RAD Radiation Absorbed Dose 1 RAD = 100 erg/gr SI: gray(Gy) 1 gray = 1 joule/Kg = 100 RAD

  6. Dose equivalent Conventional(cgs): REM Radiation Equivalent Man REM=RAD X QUALITY FACTOR (RBE) SI: sievert(Sv) 1 sievert = 100 REM

  7. Quality Factor RBE (Relative Biological Effectiveness) Weighting factor Quality factor

  8. Relative Biological Effectiveness

  9. Dose Examples Dental 0.005 mSv CXR 0.5 mSv Mammo single shot 2 mSv Mammo procedure 4-5 mSv Brain CT 0.8-5 mSv Chest CT 6-18 mSv GI series 14 mSv Average environment yearly 2.4 mSv

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