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Optics:

Luminous flux lumen lm 1 cd.sr [luminosity].[solid

angle].
-2 [luminous

Illuminance lux lx 1 lm.m
flux]/[area].
dioptry -1 Inverse of focal

Convergence dioptry 1 m
length.
Radioactivity and radiation:
becquerel -1 [number of decay
Activity Bq 1 s
events]/[time].
-1
Absorbed dose gray Gy 1 J.kg [energy]/[mass].

[energy]/[mass].

-1

Dose equivalent sievert Sv 1 J.kg Absorbed dose re-
normalized by

biological effects.

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