Charged particles weighting factor

Weighting factors recommended are approximately 1 for x-rays, gamma rays, beta particles, and electrons and 20 for conventional neutrons ( >0.1 to 2MeV), protons, alpha particles and charged particles of unknown energy. 

Figure 22.1. Weighting factor wr for charged particles as a function of their energy.

The choice of the FFF technique dictates which physicochemical parameters of the analyte govern its retention in the channel FIFFF separates solely by size, SdFFF by both size and density, ThFFF by size and chanical composition, and EIFFF by mass and charge. The dependence of retention on factors other than size can be advantageous in some applications, and different information can be obtained by employing different techniques in combination or in sequence. On the other hand, the properties that can be characterized by FFF include analyte mass, density, volume, diffusion coefficient, charge, electrophoretic mobility, p/ (isoelectric point), molecular weight, and particle diameter. 

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