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Air Kerma Strength S
K
Reference Air Kerma Rate /
Source Strength
air
The recommended unit for air kerma strength is µGy.m².h
-1
and has been denoted by
the symbol
U
:
AAPM, North America
r
2
R K
)m1( K S
⋅
=
&
1U = 1 µGy.m².h
-1
= 1
cGy.cm².h
-1