Preferred Label : photon exposure;
Detailed label : photon exposure, Hp;
IUPAC definition : Photon irradiance, Ep, integrated over the time of irradiation for a beam u incident
/u from all u upward /u directions. SI unit is m-2.;
Scope note : this quantity can be used on a chemical amount basis by dividing hpby the avogadro
constant, the symbol then being hn,p,the name photon exposure, amount basis, si unit
is mol m-2;common unit is einstein m-2.; 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 (hp,o,fp,o) is an equivalent
term.; mathematical definition: hp t t ep . if the photon irradiance
is constant over the time interval, hp ep t .;
Origin ID : P04632;
See also
Photon irradiance, Ep, integrated over the time of irradiation for a beam u incident
/u from all u upward /u directions. SI unit is m-2.
