The ratio of the transmitted
radiant power(
)
to that
incident on the sample
(
):
Internal transmittance refers to energy loss by absorption, whereas the total transmittance
is that due to absorption, reflection, scatter, etc.
Source:
PAC, 1996, 68, 2223
(Glossary of terms used in photochemistry (IUPAC Recommendations 1996))
on page 2281
PAC, 1996, 68, 957
(Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations
1996))
on page 996
,
