Application of Typical Neutron Spectra in Nuclear Power Plants to theEstimation of Neutron Doses Using Na Activation

摘要

In the case of neutron over-exposure such as criticality accident, it is important to estimate the dose of victims rapidly forthe medical treatments. Measurement of the activated sodium in the blood is widely used with many other methods foraccidental neutron dosimetry. However, this method should be supplemented by the information of neutron field at thelocation of accident for the accurate evaluation of neutron doses of the victims. To evaluate the differences of neutron dosesestimated by blood activation for various neutron fields, blood samples attached PMMA standard slab phantom was exposedby neutron fields near the reactor. The theoretical and experimental specific activities of activated sodium were comparedusing the neutron spectrum data at that place. The geometrical differences between the PMMA phantom and the BOMABwere also considered by Monte Carlo calculations. For the judgment of appropriateness to use other typical neutron spectrafor accidental cases of no neutron spectrum information existing, neutron spectra from other similar points were also appliedto the comparison. The experimental specific activity of sodium showed good agreement of with 8% with that calculated.Also, there were 40% neutron absorbed dose differences in maximum for selected neutron spectra.