Ganguly-Magee model

The Ganguly-Magee model is a 1-radical-1-scavenger model where competition between recombination and scavenging reaction is represented as follows ... 

Schwarz s model is a multiradical extension of the Ganguly-Magee model with some additional improvements, to be described later. Schwarz assumes that initially—that is, 10 11 s after the act of energy deposition in water—there appear five species, namely eh, H, OH, H30+, and H2. Their initial yields, indicated by superscript zero, are related by charge conservation and material balance. Thus, there are three independent initial yields, taken to be those of eh, H, and Hr The initial yield of H2 is identified with the unscavengable molecular hydrogen yield. No mechanism of its production is speculated, except that it is not formed by radical recombination. For the gaussian distribution of the radicals, two initial... 

Notwithstanding Platzman s theory, most calculations of radiation-chemical yields in water and aqueous solutions were performed using the free-radical model (see Magee, 1953 Samuel and Magee, 1953 Ganguly and Magee, 1956). The hypothesis was that the recapture time of the electron would be shorter than the dielectric relaxation time. Therefore, recombination would outcompete solvation. 

Further refinements of the model (Ganguly and Magee, 1956) include interspur overlap in the same track. The track is seen as a string of beads. The beads are spurs, the average spacing of which corresponds to the local LET of the particle. The free path of the incident particle between spur centers is distributed exponentially with a mean value given by... 

The model due to Ganguly and Magee [6] was then proposed to include the slowing down of the primary particle. Each spur corresponds to the same energy deposit but the interspur distance is statistically random (Fig. 1.4(b)). Other models have been reviewed by Mozumder [10]. 

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