Microdosimetric spectra and radial dose distribution of 239Pu α particles

Microdosimetric spectra and radial dose distribution of 239Pu α particles were measured by the cylindrical flowing tissue equivalent proportional counter (TEPC) with larger volume. Because the best collimated beam traverse in TEPC, the probability of energy deposition per ion traversal Rb is 1. The measured dose-mean specific energy Z1D=ab-2, b is the radial distance from track core. The method of determination of the coefficient α is given.