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In table 8.1 are compares characteristics of units of radioactivity and
radiation doses.

Table 8.1 – Units of Radioactivity and Radiation Doses

Parameter Definition Correction International Traditional Conversion
Applied Unit Unit factor
(SI unit) (Non-SI
unit)
Radioactivity Rate of No becquerel, Bq curie, Ci 1 Ci = 3.7 x
10
radiation emis- correction 10 Bq=
sion = 37
(transformation Gigabecquerels
or (GBq)
disintegration) 1 Bq = 27
from a picocurie (pCi)
radioactive
substance

Absorbed Energy imparted No gray, Gy rad (or 1 rad = 0.01
dose by radiation per correction mrad) Gy
unit mass onto (or mGy)
an absorbing
material

Equivalent Expression of Modification sievert, Sv rem (or 1 rem = 0.01
dose dose in terms of of absorbed mrem) Sv
its biological dose, (or mSv)
A
effect using w , to 1 rem = 10
R
account for mSv
differences
in radiation
type (alpha,
beta,
gamma, etc.)

Effective It is a biological Same sievert, Sv rem (or 1 rem = 0.01
dose dose commonly modification mrem) Sv
used in as above, (or mSv)
radioprotection, coupled with 1 rem = 10
as it determines adjustment mSv

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