Solid state detectors of fission fragments for the rem-dose measurement of mixed proton and neutron radiation

A method for the dosimetry of mixed proton and neutron radiation, with the help of a solid state track detector is described. Data were obtained on the distributions of the emission angles of fragments and on the total cross sections for the fission of 238U, 237Np, 232Th and 209Bi nuclei under bombardment by protons with energies between 70 and 200 MeV. The results are presented of a study on the characteristics of detectors consisting of a dielectric in contact with a heavy metal target. The range of sensitivity to the dose equivalent of the mixed proton and neutron radiation was determined. The results of the clinical dosimetry of the medical proton beam from the ITEP synchrotron, obtained using uranium and bismuth detectors, are presented. (author)