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 = 3,7х10^10 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 = 3,7х10^13 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 = 3,7х10^4 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 = 1х10^2 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 = 1х10^2 rad s^-1
Equivalent dose, Н	Sievert (Sv)	Rad-equivalent (rem)	1 rem = 1х10^-2 Sv 1 Sv = 1х10^2 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 = 1х10^2 rem s^-1
Effective dose, Е	Sievert (Sv)	Rad-equivalent (rem)	1 rem = 1х10^-2 Sv 1 Sv = 1х10^2 rem
Kerma, К	Grey (Gy)	Rad (rad)	1 rad = 1х10^-2 Gy 1 Gy = 1х10^2 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 = 1х10^2 rad s^-1
Energy, e	Joule (J)	Electron-volt (eV)	1 eV ≈ 1,60х10^-19 J 1 J ≈ 6,24х10^18 eV

Multipliers and prefixes for creation of decimal multiple and submultiple units

Multiplier	Prefix	Symbol
10^18	exci	E
10^15	peta	P
10^12	tera	T
10^9	giga	G
10^6	mega	M
10^3	kilo	k
10^2	hecto	h
10^1	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