Tracks of nuclear fission fragments

Plasma Radiolysis of CO2 in Tracks of Nuclear Fission Fragments... 

Figure 5-48. Energy efficiency of CO2 dissociation (shown in arbitrary units) during plasma radiolysis in tracks of nuclear fission fragments as a function of pressure.

In this relation, a, is the cross section of ionization for 5-electrons Zq is the sum of charge numbers of atoms forming CO2 (Zq = 44) Z and w are the charge number and velocity of a nuclear fission fragment and sg is the energy of a 5-electrom The ionization degree in the plasma channel of a nuclear track is proportional to the square of neutral gas density and pressure numerically, at atmospheric pressure, it is e/ o 3 10 in CO2. 

A more common technique employs a nuclear emulsion to detect the radiation. The sample is irradiated in close proximity to a sensitive emulsion, which is subsequently developed, fixed, and examined under the microscope. In this way it is possible to distinguish tracks due to alpha particles, fission fragments, etc. Faraggi et al. 22) and Mayr 54) used this technique to determine boron by the B (n,a)Lr reaction down to a level of 2 X 10" gm. Lithium at the 10" -gm level was determined by Picciotto and van Styvendael 69) by the reaction Li (n.,a)H and Curie and Faraggi 18) studied the distribution of uranium in the surface of polished mineral specimens by the U (n,/) reaction. 

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