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Units of Radiation

Units of Radiation. Post-doc. ACTIVITY Becquerel. Activity - Becquerel. Becquerel ( Bq ) = 1 disintegration per second ( dps ) 1 Bq = 27 picoCuries 1 kiloBq ( kBq ) = 27 nanoCuries 1 MegaBq ( MBq ) = 27 microCuries ( µ Ci )

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Units of Radiation

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  1. Units of Radiation

  2. Post-doc ACTIVITY Becquerel

  3. Activity - Becquerel • Becquerel (Bq) = 1 disintegration per second (dps) 1 Bq = 27 picoCuries 1 kiloBq (kBq) = 27 nanoCuries 1 MegaBq (MBq) = 27 microCuries (µCi) 1 GigaBq (GBq) = 27 milliCuries (mCi) 1 TeraBq (TBq) = 27 Curies

  4. Post-doc ACTIVITY Becquerel EXPOSURE INTENSITY C/kg

  5. Exposure Intensity Coulomb =6.25 x1018 elementary charges A flow of one Coulomb per sec equals one Ampere Coulomb/kg of air = 3876 Roentgens Not applicable to particle emission Does not predict tissue effects at high energies Mainly used for calibration of X-ray machines

  6. Post-doc ACTIVITY Becquerel ABSORBED DOSE Gray EXPOSURE INTENSITY C/kg

  7. Absorbed Dose Gray = Unit of absorbed dose = Joule/kg of tissue Replaced rad: radiation absorbed dose 1 Gy = 100 rads

  8. Post-doc ACTIVITY Becquerel ABSORBED DOSE Gray EXPOSURE INTENSITY C/kg DOSE EQUIVALENT Seivert

  9. Dose Equivalent Relative Biological Effectiveness • Sievert : Replaced rem :radiation equivalent in man Numerical product of Grays times a quality factor Q of the emission Sv = Gray x Q 1 SV = 100rems

  10. Quality Factors *Different types of radiation produce different amounts of biological damage for a given energy deposition: eg. alpha causes much more damage than an equal absorbed dose of gamma radiation. Q=20 for alpha particles, 1 for gamma,beta

  11. Post-doc ACTIVITY ABSORBED DOSE EXPOSURE INTENSITY DOSE EQUIVALENT Fill in the units & their equivalents

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