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SI and off-system units in the field of the ionizing irradiation, and their relations
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Parameter and its indication
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Units |
Relation between units |
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SI |
off-system |
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Activity, A |
Becquerel (Bq) |
Curie (Ci) |
1 Ci = 3,7õ1010 Bq 1 Bq ≈ 2,7õ10-11 Ci |
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Specific activity, Am |
Becquerel per kilogram (Bq kg-1) |
Curie per gram (Ci g-1) |
1 Ci g-1 = 3,7õ1013 Bq kg-1 1 Bq kg-1 ≈ 2,7õ10-14 Ci g-1 |
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Density of contamination, s |
Becquerel per square meter (Bq m-2) |
Curie per square kilometer (Ci km-2) |
1 Ci km-2 = 3,7õ104 Bq m-2 1 Bq m-2 ≈ 2,7õ10-5 Ci km-2 |
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Absorbed dose, D |
Grey (Gy) |
Rad (rad) |
1 rad = 1õ10-2 Gy 1 Gy = 1õ102 rad |
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Absorbed dose rate, |
Grey per second (Gy s-1) |
Rad per second (rad s-1) |
1 rad s-1 = 1õ10-2 Gy s-1 1 Gy s-1 = 1õ102 rad s-1 |
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Equivalent dose, Í |
Sievert (Sv) |
Rad-equivalent (rem) |
1 rem = 1õ10-2 Sv 1 Sv = 1õ102 rem |
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Equivalent dose rate, |
Sievert per second (Sv s-1) |
Rad-equivalent per second (rem s-1) |
1 rem s-1 = 1õ10-2 Sv s-1 1 Sv s-1 = 1õ102 rem s-1 |
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Effective dose, Å |
Sievert (Sv) |
Rad-equivalent (rem) |
1 rem = 1õ10-2 Sv 1 Sv = 1õ102 rem |
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Kerma, Ê |
Grey (Gy) |
Rad (rad) |
1 rad = 1õ10-2 Gy 1 Gy = 1õ102 rad |
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Rate of kerma, |
Grey per second (Gy s-1) |
Rad per second (rad s-1) |
1 rad s-1 = 1õ10-2 Gy s-1 1 Gy s-1 = 1õ102 rad s-1 |
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Energy, e |
Joule (J) |
Electron-volt (eV) |
1 eV ≈ 1,60õ10-19 J 1 J ≈ 6,24õ1018 eV |
Multipliers and prefixes for creation of decimal multiple and submultiple units
|
Multiplier |
Prefix |
Symbol |
|
1018 |
exci |
E |
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1015 |
peta |
P |
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1012 |
tera |
T |
|
109 |
giga |
G |
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106 |
mega |
M |
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103 |
kilo |
k |
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102 |
hecto |
h |
|
101 |
deca |
da |
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10-1 |
deci |
d |
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10-2 |
centi |
c |
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10-3 |
milli |
m |
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10-6 |
micro |
m |
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10-9 |
nano |
n |
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10-12 |
pico |
p |
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10-15 |
femto |
f |
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10-18 |
atto |
a |
