Feasibility Study on α Spectrometry Analysis of ²³⁷Np in Sample with High ²³⁹Pu Content

The peak shape parameters were obtained by fitting ²⁴⁴Cm α experiment spectra. The fluctuation of counts was characterized by random sampling, and a simulation method of α spectra was established. The method was verified by comparing the simulation spectra and the experiment spectra of ²³⁸Pu and ²⁴³Am. The effects of ²³⁹Pu on ²³⁷Np were analyzed. The results indicate that the relative deviation between the activity -ratio of ²³⁹Pu and ²³⁷Np (A(²³⁹Pu)/A(²³⁷Np)) obtained by spectra analysis and the preassigned value is ≤2.0% if the A(²³⁹Pu)/A(²³⁷Np) is ≤10. For the sample with A(²³⁹Pu)/A(²³⁷Np) of about 3000, ²³⁷Np can be measured with α spectrometry if the decontamination factor of ²³⁹Pu reaches to 300.