Abstract
Lineal energy spectra of fast neutrons, produced by bombarding a thick beryllium target with 14 MeV deuterons, were measured with a proportional counter simulating a sensitive diameter of 2 mu m. The mean neutron energy of the collimated beam was 6 MeV. The total lineal energy spectra, measured at different positions within a water phantom were separated into three different components: the gamma component, the recoil-proton component, and the component of heavier recoil ions. It is shown mathematically that the components of a lineal energy spectrum thus derived allow the calculation of their fractional dose contributions. These does fractions i.e. the gamma dose, the recoil-proton dose, and the dose fraction of heavier recoil ions, are shown as a function of the spatial position in the phantom.
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