Use of Fissionable Substances in Neutron Dosimetry

The authors present a neutron dosimetry method that makes use of several fissionable substances and permits direct measurement of the values of interest in dosimetry by the number of fission events. It is shown that by selecting boron filters and fissionable materials with different fission thresholds one can obtain a neutron recording efficiency that reproduces dose curves (neutron energy dependence of the maximum surface dose-equivalent and of the first-collision dose). The characteristics and construction of a detector for use in neutron dosimetry are described, and the possibilities of using different detector types (scintillation, ionization, etc.) for recording fission fragments are discussed. The authors consider the possibility of direct neutron -dose measurement by the number of fission events in a personnel dosimeter. For recording fission fragments they propose using special glass, and also ''Lavsan'' (polyester fibre) tissues or nuclear-track emulsions in the personnel dosimeter. (author)