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7272UNITS AND TERMINOLOGY“Special Units” SI UnitsExposure Roentgen Coulombs / kgDose rad (0.01 Gy) Gray (100 rad)Dose Equiv rem (0.01 Sv) Sievert (100 rem)Activity Curie (2.22 E12 dpm) Becquerel (1dps)1 Roentgen = 2.58 E-4 coulomb / kg in air=31 esu / cm in air= 87.7 ergs / gm in air= 98 ergs / gm in soft tissue1 rad = 100 ergs / gm in any absorber1 Gray = 10,000 ergs / gm in any absorber1 rem = 1 rad x QF = 0.01 SvH = DQN (from ICRP 26)H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)x N (any other modifying factors)DEFINITIONSAcuteany dose in a short period of timeChronic any dose in a long period of timeSomatic effects in the exposed individualGenetic effects in the offspring of the exposedindividualTeratogenic effects in the exposed unborn embryo/fetusStochastic effects for which a probability exists andincreases with increasing doseNon-Stochastic effects for which a threshold exists -(deterministic) effects do not occur below the threshold(examples; cataracts, erythema, epilation,acute radiation syndrome)UNITS AND TERMINOLOGY“Special Units” SI UnitsExposure Roentgen Coulombs / kgDose rad (0.01 Gy) Gray (100 rad)Dose Equiv rem (0.01 Sv) Sievert (100 rem)Activity Curie (2.22 E12 dpm) Becquerel (1dps)1 Roentgen = 2.58 E-4 coulomb / kg in air=31 esu / cm in air= 87.7 ergs / gm in air= 98 ergs / gm in soft tissue1 rad = 100 ergs / gm in any absorber1 Gray = 10,000 ergs / gm in any absorber1 rem = 1 rad x QF = 0.01 SvH = DQN (from ICRP 26)H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)x N (any other modifying factors)DEFINITIONSAcuteany dose in a short period of timeChronic any dose in a long period of timeSomatic effects in the exposed individualGenetic effects in the offspring of the exposedindividualTeratogenic effects in the exposed unborn embryo/fetusStochastic effects for which a probability exists andincreases with increasing doseNon-Stochastic effects for which a threshold exists -(deterministic) effects do not occur below the threshold(examples; cataracts, erythema, epilation,acute radiation syndrome)7272UNITS AND TERMINOLOGY“Special Units” SI UnitsExposure Roentgen Coulombs / kgDose rad (0.01 Gy) Gray (100 rad)Dose Equiv rem (0.01 Sv) Sievert (100 rem)Activity Curie (2.22 E12 dpm) Becquerel (1dps)1 Roentgen = 2.58 E-4 coulomb / kg in air=31 esu / cm in air= 87.7 ergs / gm in air= 98 ergs / gm in soft tissue1 rad = 100 ergs / gm in any absorber1 Gray = 10,000 ergs / gm in any absorber1 rem = 1 rad x QF = 0.01 SvH = DQN (from ICRP 26)H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)x N (any other modifying factors)DEFINITIONSAcuteany dose in a short period of timeChronic any dose in a long period of timeSomatic effects in the exposed individualGenetic effects in the offspring of the exposedindividualTeratogenic effects in the exposed unborn embryo/fetusStochastic effects for which a probability exists andincreases with increasing doseNon-Stochastic effects for which a threshold exists -(deterministic) effects do not occur below the threshold(examples; cataracts, erythema, epilation,acute radiation syndrome)UNITS AND TERMINOLOGY“Special Units” SI UnitsExposure Roentgen Coulombs / kgDose rad (0.01 Gy) Gray (100 rad)Dose Equiv rem (0.01 Sv) Sievert (100 rem)Activity Curie (2.22 E12 dpm) Becquerel (1dps)1 Roentgen = 2.58 E-4 coulomb / kg in air=31 esu / cm in air= 87.7 ergs / gm in air= 98 ergs / gm in soft tissue1 rad = 100 ergs / gm in any absorber1 Gray = 10,000 ergs / gm in any absorber1 rem = 1 rad x QF = 0.01 SvH = DQN (from ICRP 26)H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)x N (any other modifying factors)DEFINITIONSAcuteany dose in a short period of timeChronic any dose in a long period of timeSomatic effects in the exposed individualGenetic effects in the offspring of the exposedindividualTeratogenic effects in the exposed unborn embryo/fetusStochastic effects for which a probability exists andincreases with increasing doseNon-Stochastic effects for which a threshold exists -(deterministic) effects do not occur below the threshold(examples; cataracts, erythema, epilation,acute radiation syndrome)