https://doi.org/10.1351/goldbook.P04632
Photon irradiance
, irradiation
for a beam incident from all upward directions. SI unit is Notes:
- Mathematical definition:
. If thephoton irradianceis constant over the time interval, . - This term refers to a beam not scattered or reflected by the target or its surroundings. For a beam incident from all directions photon fluence (
, ) is an equivalent term. - This quantity can be used on a chemical amountbasis by dividing
by theAvogadro constant, the symbol then being , the name 'photon exposure, amount basis', SI unit is ; common unit is .