https://doi.org/10.1351/goldbook.D01605
The inverse of the , is used, the depth of penetration ( ) is the distance at which the , decreases to one tenth of its incident value, . If the Naperian , is used, the depth of penetration ( in this case) is the distance at which the of its incident value.
absorption coefficient
. If the decadic absorption coefficient
, radiant power
, absorption coefficient
, radiant power
decreases to See:
absorbance
, attenuance