Gilson and Voss - Voss Associates
Gilson and Voss - Voss Associates
Gilson and Voss - Voss Associates
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UNITS AND TERMINOLOGY<br />
“Special Units” SI Units<br />
Exposure Roentgen Coulombs / kg<br />
Dose rad (0.01 Gy) Gray (100 rad)<br />
Dose Equiv rem (0.01 Sv) Sievert (100 rem)<br />
Activity Curie (2.22 E12 dpm) Becquerel (1dps)<br />
1 Roentgen = 2.58 E-4 coulomb / kg in air<br />
=<br />
3<br />
1 esu / cm in air<br />
= 87.7 ergs / gm in air<br />
= 98 ergs / gm in soft tissue<br />
1 rad = 100 ergs / gm in any absorber<br />
1 Gray = 10,000 ergs / gm in any absorber<br />
1 rem = 1 rad x QF = 0.01 Sv<br />
H = DQN (from ICRP 26)<br />
H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)<br />
x N (any other modifying factors)<br />
DEFINITIONS<br />
Acute<br />
any dose in a short period of time<br />
Chronic any dose in a long period of time<br />
Somatic effects in the exposed individual<br />
Genetic effects in the offspring of the exposed<br />
individual<br />
Teratogenic effects in the exposed unborn embryo/fetus<br />
Stochastic effects for which a probability exists <strong>and</strong><br />
increases with increasing dose<br />
Non-Stochastic effects for which a threshold exists -<br />
(deterministic) effects do not occur below the threshold<br />
(examples; cataracts, erythema, epilation,<br />
acute radiation syndrome)<br />
UNITS AND TERMINOLOGY<br />
“Special Units” SI Units<br />
Exposure Roentgen Coulombs / kg<br />
Dose rad (0.01 Gy) Gray (100 rad)<br />
Dose Equiv rem (0.01 Sv) Sievert (100 rem)<br />
Activity Curie (2.22 E12 dpm) Becquerel (1dps)<br />
1 Roentgen = 2.58 E-4 coulomb / kg in air<br />
=<br />
3<br />
1 esu / cm in air<br />
= 87.7 ergs / gm in air<br />
= 98 ergs / gm in soft tissue<br />
1 rad = 100 ergs / gm in any absorber<br />
1 Gray = 10,000 ergs / gm in any absorber<br />
1 rem = 1 rad x QF = 0.01 Sv<br />
H = DQN (from ICRP 26)<br />
H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)<br />
x N (any other modifying factors)<br />
DEFINITIONS<br />
Acute<br />
any dose in a short period of time<br />
Chronic any dose in a long period of time<br />
Somatic effects in the exposed individual<br />
Genetic effects in the offspring of the exposed<br />
individual<br />
Teratogenic effects in the exposed unborn embryo/fetus<br />
Stochastic effects for which a probability exists <strong>and</strong><br />
increases with increasing dose<br />
Non-Stochastic effects for which a threshold exists -<br />
(deterministic) effects do not occur below the threshold<br />
(examples; cataracts, erythema, epilation,<br />
acute radiation syndrome)<br />
Page 140<br />
Page 140<br />
UNITS AND TERMINOLOGY<br />
“Special Units” SI Units<br />
Exposure Roentgen Coulombs / kg<br />
Dose rad (0.01 Gy) Gray (100 rad)<br />
Dose Equiv rem (0.01 Sv) Sievert (100 rem)<br />
Activity Curie (2.22 E12 dpm) Becquerel (1dps)<br />
1 Roentgen = 2.58 E-4 coulomb / kg in air<br />
=<br />
3<br />
1 esu / cm in air<br />
= 87.7 ergs / gm in air<br />
= 98 ergs / gm in soft tissue<br />
1 rad = 100 ergs / gm in any absorber<br />
1 Gray = 10,000 ergs / gm in any absorber<br />
1 rem = 1 rad x QF = 0.01 Sv<br />
H = DQN (from ICRP 26)<br />
H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)<br />
x N (any other modifying factors)<br />
DEFINITIONS<br />
Acute<br />
any dose in a short period of time<br />
Chronic any dose in a long period of time<br />
Somatic effects in the exposed individual<br />
Genetic effects in the offspring of the exposed<br />
individual<br />
Teratogenic effects in the exposed unborn embryo/fetus<br />
Stochastic effects for which a probability exists <strong>and</strong><br />
increases with increasing dose<br />
Non-Stochastic effects for which a threshold exists -<br />
(deterministic) effects do not occur below the threshold<br />
(examples; cataracts, erythema, epilation,<br />
acute radiation syndrome)<br />
UNITS AND TERMINOLOGY<br />
“Special Units” SI Units<br />
Exposure Roentgen Coulombs / kg<br />
Dose rad (0.01 Gy) Gray (100 rad)<br />
Dose Equiv rem (0.01 Sv) Sievert (100 rem)<br />
Activity Curie (2.22 E12 dpm) Becquerel (1dps)<br />
1 Roentgen = 2.58 E-4 coulomb / kg in air<br />
=<br />
3<br />
1 esu / cm in air<br />
= 87.7 ergs / gm in air<br />
= 98 ergs / gm in soft tissue<br />
1 rad = 100 ergs / gm in any absorber<br />
1 Gray = 10,000 ergs / gm in any absorber<br />
1 rem = 1 rad x QF = 0.01 Sv<br />
H = DQN (from ICRP 26)<br />
H (Dose Equiv.) = D (absorbed dose) x Q (quality factor)<br />
x N (any other modifying factors)<br />
DEFINITIONS<br />
Acute<br />
any dose in a short period of time<br />
Chronic any dose in a long period of time<br />
Somatic effects in the exposed individual<br />
Genetic effects in the offspring of the exposed<br />
individual<br />
Teratogenic effects in the exposed unborn embryo/fetus<br />
Stochastic effects for which a probability exists <strong>and</strong><br />
increases with increasing dose<br />
Non-Stochastic effects for which a threshold exists -<br />
(deterministic) effects do not occur below the threshold<br />
(examples; cataracts, erythema, epilation,<br />
acute radiation syndrome)<br />
Page 140<br />
Page 140