Efficiency of Neutron Converter Screens for Microfilter Production
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Abstract
Production of microfilter polymer membrane was studied by using alpha particles from 10B(n, α)7 Li and6Li(n,α)3H nuclear reactions and fission fragment from U-235 nuclear fission. The high-energy charged particlecaused latent track on polymer film which was enlarged by chemical etching in 70 oC 6.25 N NaOH solution for 80 minutes. The examination of 4 types of polymer films i.e., CR-39, cellulose acetate, polyethylene terephthalateand thin film polycarbonate showed that only CR-39 film could observe alpha tracks. The track range was shorterthan film thickness. Fission track could be found in all of the 4 types of films in which only 6 micrometerpolycarbonate film was porous. The pore density of fission track from uranium screen on polycarbonate film was220 ± 70 pore mm-2 with 4.43 ± 0.87 micrometer pore size. The converter efficiency of neutron to fission trackwas 1.5 x 10-8 - 2.9 x 10-8 tracks per neutron.
Keywords : Neutron / Neutron Converter Screen / Micropore Filter / Nuclear Reaction (n, α)/Polymer / Chemical Etching / Nuclear Fission Reaction