Track entity distribution

Figure 2-4. Distribution of dose around the ions path (a) and averaged dose within track entities and whole cross section (b). D is macroscopically averaged dose at a fixed depth, D = FS where F is fluence and S is stopping power, Dp is averaged dose for penumbla, D,. for core, Dt for intermediate-sized track, such as chemical core, respectively. The s,., St and Sp, mean the cross section for core, track and penumbla respectively. Scale is in arbitrary unit.

R. R. Brooks, C. Griffin, and D. S. Friedlander, Self-organized distributed sensor network entity tracking , International Journal of High Performance Computing Applications, Vol. 16, No. 3, pp. 207-219, August 2002. 

Alpha radiation differs from gamma or electron radiation primarily in the much denser distribution of reactive entities along the alpha particle track with ultraviolet light at 254m often requiring the presence of a sensitizer, one is dealing primarily with excitation and not ionization. 

Since the optical approximation is valid for all fast electrons, and since the latter are all able to induce the entire spectrum of optical transitions, the energy distribution of spurs is the same for isolated spurs and for the spurs in blobs or short tracks. The average energy per spur is thus equal in all entities and the partition of energy between spurs, blobs, and short tracks is approximately given by the above ratios, too. This is one of the reasons why the yield gs caused by slow electrons is uniformly added to the whole area of the yield g° of spurs in Figure 1. 

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