
TY  - JOUR
A1  - Candler, C 
T1  - The Gradation and Inertia of Hurter and Driffield: A Study in Theory
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1961
VL  - 14
IS  - 1
SP  - 160
EP  - 173
KW  - 
UR  - https://doi.org/10.1071/PH610160 
N2  - In a deep emulsion the shape of the D-Iog E characteristic depends on two quantities, the photon number P, which is determined by the number of photons required to form a development centre, and the ratio K of the absorption cross sections of a silver halide crystal before and after development. The position of the curve on the exposure axis is determined by the mean reaction cross section 8 of the crystals. In a coating a fourth quantity enters, the" opacity before development" of Hurter and Driffield, here called the exposure ratio R of front to back surface. 
ER  -

