Abstract
The ion beam intensity distribution in an ion-beam-bombarded area is particularly important for treating biological targets that are location-sensitive to ion energy and fluence. In order to investigate the beam intensity distribution, we carried out a theoretical calculation. The theoretical study was started from an assumption of a certain 3-D distribution of the beam intensity for a fixed beam spot and was followed by integration to describe a scanning of this beam spot within a certain target area. The details of the calculations with an example of Gaussian distribution for the initial fixed beam spot are presented. The calculated result was compared with an experimentallymeasured ion-beam intensity distribution, and good agreement was achieved. The scanning ionbeam intensity distribution was applied to guide ion-beam-induced gene transfer in biological cells such as the bacteria E. coli.
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