Units of Radiation
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Transcript of Units of Radiation
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Health, Safety and Environmentwww.hse.ubc.ca
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Units of Radiation
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Post-doc
ACTIVITYBecquerel
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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
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Post-doc
ACTIVITYBecquerel
EXPOSURE INTENSITY C/kg
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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
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ABSORBED DOSE Gray
Post-doc
ACTIVITYBecquerel
EXPOSURE INTENSITY C/kg
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Absorbed Dose
• Gray = Unit of absorbed dose= Joule/kg of tissue
• Replaced rad: radiation absorbed dose
• 1 Gy = 100 rads
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ABSORBED DOSE Gray
Post-doc
ACTIVITYBecquerel
EXPOSURE INTENSITY C/kg
DOSE EQUIVALENT Seivert
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Dose Equivalent
• Sievert : Replaced rem :radiation equivalent in
man Numerical product of Grays times a
quality factor Q of the emission Sv = Gray x Q
Relative Biological Effectiveness
1 SV = 100rems
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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,betaQ=20 for alpha particles, 1 for gamma,beta
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ABSORBED DOSE
Post-doc
ACTIVITY
EXPOSURE INTENSITY DOSE EQUIVALENT