Radiation Measurement Units - International (SI) System

The curie (Ci) is replaced by the becquerel (Bq)*
1 kilocurie (kCi) = 37 terabecquerel (TBq)
1 curie (Ci) = 37 gigabecquerel (GBq)
1 millicurie (mCi) = 37 megabecquerel (MBq)
1 microcurie (µCi) = 37 kilobecquerel (kBq)
1 nanocurie (nCi) = 37 becquerel (Bq)
1 picocurie (pCi) = 37 millibecquerel (mBq)

Becquerel (Bq)* replaces the curie (Ci)
1 terabecquerel (TBq) ~ 27 curie (Ci)
1 gigabecquerel (GBq) ~ 27 millicurie (mCi)
1 megabecquerel (MBq) ~ 27 microcurie (µCi)
1 kilobecquerel (kBq) ~ 27 nanocurie (nCi)
1 becquerel (Bq) ~ 27 picocurie (pCi)
* 1 Bq = 1s-1

The rad (rad) is replaced by the gray (Gy)
1 kilorad (krad) = 10 gray (Gy)
1 rad (rad) = 10 milligray (mGy)
1 millirad (mrad) = 10 microgray (µGy)
1 microrad (µrad) = 10 nanogray (nGy)
The gray (Gy) replaces the rad (rad)
1 gray (Gy) =100 rad (rad)
1 milligray (mGy) = 100 millirad (mrad)
1 microgray (µGy) = 100 microrad (µrad)
1 nanogray (nGy) = 100 nanorad (nrad)
The roentgen (R) is replaced by coulomb/kg (C/kg)
1 kiloroentgen (kR) ~ 258 millicoulomb/kg (mC/kg)
1 roentgen (R) ~ 258 microcoulomb/kg (µC/kg)
1 milliroentgen (mR) ~ 258 nanocoulomb/kg (nC/kg)
1 microroentgen (µR) ~ 258 picocoulomb/kg (pC/kg)
Coulomb/kg (C/kg) replaces the roentgen (R)
1 coulomb/kg (C/kg) ~ 3876 roentgen (R)
1 millicoulomb/kg (mC/kg) ~ 3876 milliroentgen (mR)
1 microcoulomb/kg (µC/kg) ~ 3876 microroentgen (µR)
1 nanocoulomb/kg (nC/kg) ~ 3876 nanoroentgen (nR)
The rem (rem) is replaced by the sievert (Sv)
1 kilorem (krem) = 10 sievert (Sv)
1 rem (rem) = 10 millisievert (mSv)
1 millirem (mrem) = 10 microsievert (µSv)
1 microrem (µrem) = 10 nanosievert (nSv)
The sievert (Sv) replaces the rem (rem)
1 sievert (Sv) = 100 rem (rem)
1 millisievert (mSv) = 100 millirem (mrem)
1 microsievert (µSv) = 100 microrem (µrem)
1 nanosievert (nSv) = 100 nanorem (nrem)

Above table reproduced here courtesy of Health Canada



SI Prefixes For Multiples And Submultiples Of SI Units

yotta (Y) 1,000,000,000,000,000,000,000,000 = 10^24 = 1 septillion
zetta (Z) 1,000,000,000,000,000,000,000 = 10^21 = 1 sextillion
exa (E) 1,000,000,000,000,000,000 = 10^18 = 1 quintillion
peta (P) 1,000,000,000,000,000 = 10^15 = 1 quadrillion
tera (T) 1,000,000,000,000 = 10^12 = 1 trillion
giga (G) 1,000,000,000 = 10^9 = 1 billion
mega (M) 1,000,000 = 10^6 = 1 million
kilo (k) 1,000 = 10^3 = 1 thousand
hecto (h) 100 = 10^2 = 1 hundred
deka (da)10 = 10 = ten
1
deci (d) 0.1 =10^-1 = 1 tenth
centi (c) 0.01 = 10^-2 = 1 hundredth
milli (m) 0.001 = 10^-3 = 1 thousandth
micro (µ) 0.000 001 = 10^-6 = 1 millionth
nano (n) 0.000 000 001 = 10^-9 = 1 billionth

pico (p) 0.000 000 000 001 = 10^-12 = 1 trillionth
femto (f) 0.000 000 000 000 001 = 10^-15 = 1 quadrillionth
atto (a) 0.000 000 000 000 000 001 = 10^-18 = 1 quintillionth
zepto (z) 0.000 000 000 000 000 000 001 = 10^-21 = 1 sextillionth
yocto (y) 0.000 000 000 000 000 000 000 001 = 10^-24 = 1 septillionth



Downloads for more information on the International System Of Units

The International System of Units (SI) 7th Edition - 1998
From: Bureau International des Poids et Mesures
Available here in Adobe® PDF Format - English Version

Supplement 2000: Addenda and Corrigenda to the 7th Edition -1998
From: Bureau International des Poids et Mesures
Available here in Adobe® PDF Format - English & French Versions

Guide For The Use Of The International System Of Units (SI)
NIST Special Publication 811 - 1995 Edition
Available here in Adobe® PDF Format



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