SI and off-system units in the
field of the ionizing irradiation,
and their relations
Parameter and its indication |
Units |
Relation between units |
|
SI |
off-system |
|
|
Activity, A |
Becquerel (Bq) |
Curie (Ci) |
1 Ci
= 3,7х1010 Bq 1 Bq
≈ 2,7х10-11 Ci |
Specific activity, Am |
Becquerel per kilogram (Bq kg-1) |
Curie per gram (Ci
g-1) |
1 Ci
g-1 = 3,7х1013 Bq kg-1
1 Bq
kg-1 ≈ 2,7х10-14 Ci g-1
|
Density of contamination, s |
Becquerel per square meter
(Bq m-2) |
Curie per square kilometer
(Ci km-2) |
1 Ci
km-2 = 3,7х104 Bq m-2
1 Bq
m-2 ≈ 2,7х10-5 Ci km-2
|
Absorbed dose, D |
Grey (Gy) |
Rad (rad) |
1 rad
= 1х10-2 Gy 1 Gy
= 1х102 rad |
Absorbed dose rate, |
Grey per second (Gy
s-1) |
Rad per second (rad
s-1) |
1 rad
s-1 = 1х10-2 Gy s-1
1 Gy
s-1 = 1х102 rad s-1 |
Equivalent dose, Н |
Sievert (Sv) |
Rad-equivalent (rem) |
1 rem
= 1х10-2 Sv 1 Sv
= 1х102 rem |
Equivalent dose rate, |
Sievert per second (Sv s-1) |
Rad-equivalent per
second (rem s-1) |
1 rem
s-1 = 1х10-2 Sv s-1
1 Sv
s-1 = 1х102 rem s-1 |
Effective dose, Е |
Sievert (Sv) |
Rad-equivalent (rem) |
1 rem
= 1х10-2 Sv 1 Sv
= 1х102 rem |
Kerma, К |
Grey (Gy) |
Rad (rad) |
1 rad
= 1х10-2 Gy 1 Gy
= 1х102 rad |
Rate of kerma, |
Grey per second (Gy
s-1) |
Rad per second (rad
s-1) |
1 rad
s-1 = 1х10-2 Gy s-1
1 Gy
s-1 = 1х102 rad s-1 |
Energy, e |
Joule
(J) |
Electron-volt (eV) |
1 eV
≈ 1,60х10-19 J 1 J ≈ 6,24х1018
eV |
Multipliers and prefixes for creation of decimal multiple and submultiple units
Multiplier |
Prefix |
Symbol |
1018 |
exci |
E |
1015 |
peta |
P |
1012 |
tera |
T |
109 |
giga |
G |
106 |
mega |
M |
103 |
kilo |
k |
102 |
hecto |
h |
101 |
deca |
da |
10-1 |
deci |
d |
10-2 |
centi |
c |
10-3 |
milli |
m |
10-6 |
micro |
m |
10-9 |
nano |
n |
10-12 |
pico |
p |
10-15 |
femto |
f |
10-18 |
atto |
a |