Required to Obtain Absolute Values of Reduced Intensity from Experimental Readings

Corrections Required to Obtain Absolute Values of Reduced Intensity from Experimental Readings. 

The volume correction factor of Carr is in general very small compared to the refractive index correction we shall not discuss it here. 

Both Carr and Brice, Halwer and Speiser have studied carefully the calibration of absolute intensity of scattering by comparison with the reflected intensity from diffusely reflecting surfaces, such as magnesium oxide or casein paint. Apparently none of these surfaces acts as an ideal diffuse reflector there is always at least a small fraction of the light which undergoes specular reflection, and this must be allowed for in the calibration of light scattering measurements. 

In Debye s laboratory at Cornell University, absolute turbidities have been determined by comparing the intensity of the scattered light with that of a small portion of the incident beam, the latter having been weakened in intensity by a known factor by means of several successive reflections (P. Debye, 1944, 1947 P. P. Debye, 1946). 

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